Relevant bibliographies by topics / Hybrid ligands

Academic literature on the topic 'Hybrid ligands'

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Published: 4 June 2021
Last updated: 25 April 2022

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Journal articles on the topic "Hybrid ligands"

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Fourmy, Kévin, Duc Hanh Nguyen, Odile Dechy-Cabaret, and Maryse Gouygou. "Phosphole-based ligands in catalysis." Catalysis Science & Technology 5, no. 9 (2015): 4289–323. http://dx.doi.org/10.1039/c4cy01701c.

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This review provides an overview of phosphole-based ligand families (monophospholes, multidentate hybrid phosphole ligands, diphosphole and 2,2′-biphosphole-based ligands) and their potential in metal- and organo-catalyzed reactions (asymmetric reactions included).
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Noh, Hyun Sung, and Jaehan Jung. "Synthesis of Organic–Inorganic Hybrid Nanocomposites via a Simple Two-Phase Ligands Exchange." Science of Advanced Materials 12, no. 3 (March 1, 2020): 326–32. http://dx.doi.org/10.1166/sam.2020.3644.

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The surface of nanocrystals (NCs) was precisely engineered with bifunctional ligands via a simple yet effective two-phase ligand exchange strategy where the introduction of bifunctional ligands and displacement of insulating aliphatic ligands are simultaneously occurred. This is advantageous compared to conventional ligands exchange procedure where the desired ligands are often introduced through two-step processes after treating NC surface with short mobile ligands such as pyridine or short amines. In this study, 4-azidobenzoic acid possessing carboxylic acid for binding with NCs and azide group for chemical coupling was utilized as bifunctional ligands. A correlation between the concentration and the efficiency of ligands replacement was corroborated by Fourier transform infrared (FTIR) spectroscopy and nuclear magnetic resonance (1H NMR) spectroscopy measurement. Lastly, organic–inorganic nanocomposites were crafted via click coupling between 1-octyne and azidobenzoic acid capped CdSe NCs. The success of coupling was substantiated by FTIR and 1H NMR.
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Luo, Yanqing, Tao Tan, Sen Wang, Ran Pang, Lihong Jiang, Da Li, Jing Feng, Hongjie Zhang, Su Zhang, and Chengyu Li. "Multivariant ligands stabilize anionic solvent-oriented α-CsPbX3 nanocrystals at room temperature." Nanoscale 13, no. 9 (2021): 4899–910. http://dx.doi.org/10.1039/d0nr08697e.

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A self-assembly method is proposed for cubic phase CsPbX3 nanocrystals under ambient conditions. Long-term stability and high quantum efficiency are maintained via ligand evolution from paired X type ligands to hybrid L–X type ligands.
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Sheng, Kai, Jie Lin Wang, Ying Li, Yi Han Wang, Meng Xue Xu, and An Jin Liu. "Synthesis and Characterization of Luminescence Eu3+/Polyurethane Composite Material." Advanced Materials Research 884-885 (January 2014): 247–50. http://dx.doi.org/10.4028/www.scientific.net/amr.884-885.247.

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Selecting lactam 2,6-pyridinedicarboxamide (PDCA) as the ligand and 1,4-butanediol as chain extender, we prepare polyurea polyurethane PDCA-PU; then, introduction of rare earth ion Eu3+ and small molecule ligands 1,10-phenanthroline (phen), synthesized binary and ternary polyurethane composite containing Eu3+, and comparing the fluorescence properties of the material. We investigated the thermal stability and luminescence properties of hybrids and found that the ternary hybrid materials exhibit better thermal stability and stronger emission intensity.
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Biswas, Kabir H., and Jay T. Groves. "Hybrid Live Cell–Supported Membrane Interfaces for Signaling Studies." Annual Review of Biophysics 48, no. 1 (May 6, 2019): 537–62. http://dx.doi.org/10.1146/annurev-biophys-070317-033330.

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A wide range of cell–microenvironmental interactions are mediated by membrane-localized receptors that bind ligands present on another cell or the extracellular matrix. This situation introduces a number of physical effects including spatial organization of receptor–ligand complexes and development of mechanical forces in cells. Unlike traditional experimental approaches, hybrid live cell–supported lipid bilayer (SLB) systems, wherein a live cell interacts with a synthetic substrate supported membrane, allow interrogation of these aspects of receptor signaling. The SLB system directly offers facile control over the identity, density, and mobility of ligands used for engaging cellular receptors. Further, application of various nano- and micropatterning techniques allows for spatial patterning of ligands. In this review, we describe the hybrid live cell–SLB system and its application in uncovering a range of spatial and mechanical aspects of receptor signaling. We highlight the T cell immunological synapse, junctions formed between EphA2- and ephrinA1-expressing cells, and adhesions formed by cadherin and integrin receptors.
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Vazquez-Rodriguez, Saleta, Santiago Vilar, Sonja Kachler, Karl-Norbert Klotz, Eugenio Uriarte, Fernanda Borges, and Maria João Matos. "Adenosine Receptor Ligands: Coumarin–Chalcone Hybrids as Modulating Agents on the Activity of hARs." Molecules 25, no. 18 (September 19, 2020): 4306. http://dx.doi.org/10.3390/molecules25184306.

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Adenosine receptors (ARs) play an important role in neurological and psychiatric disorders such as Alzheimer’s disease, Parkinson’s disease, epilepsy and schizophrenia. The different subtypes of ARs and the knowledge on their densities and status are important for understanding the mechanisms underlying the pathogenesis of diseases and for developing new therapeutics. Looking for new scaffolds for selective AR ligands, coumarin–chalcone hybrids were synthesized (compounds 1–8) and screened in radioligand binding (hA1, hA2A and hA3) and adenylyl cyclase (hA2B) assays in order to evaluate their affinity for the four human AR subtypes (hARs). Coumarin–chalcone hybrid has been established as a new scaffold suitable for the development of potent and selective ligands for hA1 or hA3 subtypes. In general, hydroxy-substituted hybrids showed some affinity for the hA1, while the methoxy counterparts were selective for the hA3. The most potent hA1 ligand was compound 7 (Ki = 17.7 µM), whereas compound 4 was the most potent ligand for hA3 (Ki = 2.49 µM). In addition, docking studies with hA1 and hA3 homology models were established to analyze the structure–function relationships. Results showed that the different residues located on the protein binding pocket could play an important role in ligand selectivity.
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Horvath, Marcou, and Varnek. "Generative Topographic Mapping of the Docking Conformational Space." Molecules 24, no. 12 (June 18, 2019): 2269. http://dx.doi.org/10.3390/molecules24122269.

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Following previous efforts to render the Conformational Space (CS) of flexible compounds by Generative Topographic Mapping (GTM), this polyvalent mapping technique is here adapted to the docking problem. Contact fingerprints (CF) characterize ligands from the perspective of the binding site by monitoring protein atoms that are “touched” by those of the ligand. A “Contact” (CF) map was built by GTM-driven dimensionality reduction of the CF vector space. Alternatively, a “Hybrid” (Hy) map used a composite descriptor of CFs concatenated with ligand fragment descriptors. These maps indirectly represent the active site and integrate the binding information of multiple ligands. The concept is illustrated by a docking study into the ATP-binding site of CDK2, using the S4MPLE program to generate thousands of poses for each ligand. Both maps were challenged to (1) Discriminate native from non-native ligand poses, e.g., create RMSD-landscapes “colored” by the conformer ensemble of ligands of known binding modes in order to highlight “native” map zones (poses with RMSD to PDB structures < 2Å). Then, projection of poses of other ligands on such landscapes might serve to predict those falling in native zones as being well-docked. (2) Distinguish ligands–characterized by their ensemble of conformers–by their potency, e.g., testing the hypotheses whether zones privileged by potent binders are clearly separated from the ones preferred by decoys on the maps. Hybrid maps were better in both challenges and outperformed the classical energy and individual contact satisfaction scores in discriminating ligands by potency. Moreover, the intuitive visualization and analysis of docking CS may, as already mentioned, have several applications–from highlighting of key contacts to monitoring docking calculation convergence.
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Sugama, Hiroshi, Hirohisa Saito, Hiroshi Danjo, and Tsuneo Imamoto. "P-Chirogenic Phosphine/Sulfide Hybrid Ligands." Synthesis 2001, no. 15 (2001): 2348–53. http://dx.doi.org/10.1055/s-2001-18433.

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Cubanski, John R., Matthew E. Reish, Allan G. Blackman, Peter J. Steel, Keith C. Gordon, David A. McMorran, and James D. Crowley. "Hybrid Pyrazolyl-1,2,3-Triazolyl Tripodal Tetraamine Ligands: Click Synthesis and Cobalt(III) Complexes." Australian Journal of Chemistry 68, no. 7 (2015): 1160. http://dx.doi.org/10.1071/ch14700.

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A family of tripodal tetraamine ligands incorporating two pyrazolyl and one 1,2,3-triazolyl donor arm have been synthesized in modest-to-excellent yields (42–90 %) using the copper(i)-catalyzed azide–alkyne cycloaddition (CuAAC) reaction. Mono-, bis-, and tris-tripodal ligand scaffolds were readily generated using this method. The coordination chemistry of the ligands with cobalt(iii) ions has been studied, and cobalt(iii) carbonato complexes of the ligands have been isolated and characterized spectroscopically and crystallographically. X-ray crystallography and NMR spectroscopy of the mono-metallic complexes showed that racemic mixtures of the cis-isomer are formed selectively. The di- and tri-metallic systems could not be crystallized, but NMR spectroscopy indicates that these compounds were isolated as mixtures of stereoisomers.
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Yang, Jia Wei, Xian Ge Xie, Xiao Mei Wang, Chang Qing Ye, and Yu Yang Zhou. "Structure-Performance Correlations in Electrochromic Behaviors of Terpyridine-Metal Hybrid Materials." Materials Science Forum 852 (April 2016): 156–63. http://dx.doi.org/10.4028/www.scientific.net/msf.852.156.

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Exploring the structure-property relationships is a fundamental but significant work for the design of new molecular. Rationaly designing of electrochromic materials that can switch rapidly and durably requires sophisticated understanding of the correlations between molecular structure and the performance. This work presents four electro-polymerizable metallosupramolecular coordinations self-assembled from triphenylamine-based terpyridine ligands and metal ions (Fe2+, Ru2+). The polymerized metal complexes can exhibit reversible change of the metal-to-ligand charge transfer (MLCT) absorption intensity. Along with the increase of voltage, the intensity of MLCT absorption peaks gradually reduced to disappear. Structure/performance correlations in electrochromic performance, especially the influence of different ligands and metal ions upon the coloration efficiency have been discussed.
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Dissertations / Theses on the topic "Hybrid ligands"

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Jones, Claire Frances. "Lanthanide complexes of bulky hybrid ligands." Thesis, University of Newcastle upon Tyne, 2017. http://hdl.handle.net/10443/4009.

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The synthetic and redox chemistry of lanthanide organometallic complexes has considerably expanded since the discovery of Kagan’s reagent in 1977 and divalent ionic complexes are now known for the entire lanthanide series. The synthesis, solid-state structures and reductive chemistry of trivalent and divalent lanthanide complexes with cyclopentadienyl-type ligands is reviewed with a focus on the impact of the ligand on the reducing power of the metal centre. Trimethylsilyl and more recently, phosphine-borane stabilised carbanions have facilitated the isolation of trivalent and divalent lanthanide complexes of alkyl ligands with Ln—C σ-bonds. The synthesis, structures and known reactivity of these compounds is discussed. In order to probe the impact of alkyl carbanion and cyclopentadienyl coordination on lanthanide complex stability, structure and redox reactivity we have designed a novel set of hybrid ligands that combine these two functional groups into a single dianionic ligand. These ligands are potentially very versatile as the sterics and electronics of both groups in the ligand can be modified. The ligands are viable to support sterically congested trivalent complexes for sterically induced reduction as well as metal based reduction and they are good ligands for heteroleptic complexes because they chelate the metal avoiding ligand redistribution equilibria. The synthesis and characterisation of a range of trimethylsilyl-, phosphine-borane- and phosphine-stabilised alkyl bromo- and chlorosilane precursors is described: (Me3Si)2CHSiMe2Br [4], (Me3Si){PMe2(BH3)}CHSiMe2Cl [9], (Me3Si){PnPr2(BH3)}CHSiMe2Cl [13], {PMe2(BH3)}2CHSiMe2Cl [23], {PMe2(BH3)}{PPh2(BH3)}CHSiMe2Cl [27], {PPh2(BH3)}2CHSiMe2Cl [31] and (nPr2P)2CHSiMe2Cl [32]. iv The results of a computational study using NBO methods to investigate the relative stabilising effect of each of these silyl, phosphine-borane and phosphine carbanion stabilising groups on a model system akin to the alkyl part of the hybrid ligand are described. Reaction of (Me3Si)2CHSiMe2Br with Li/Na/K Cp/Cp’/Cp4Me followed by aqueous work-up gave the hybrid proligands {(CpH)Me2Si}(Me3Si)2CH [5], {(Cp’H)Me2Si}(Me3Si)2CH [6] and {Cp4MeH)Me2Si}(Me3Si)2CH [7] as mixtures of regioisomers [Cp4Me = 1,2,3,4-Tetramethyl-cyclopentadiene]. Reaction of LiCp4Me/KCp4Me with (Me3Si){PMe2(BH3)}CHSiMe2Cl and (Me3Si){PnPr2(BH3)}CHSiMe2Cl gave the hybrid proligands (CpH4MeMe2Si)(Me3Si)CH{PMe2(BH3)} [10] and (CpH4MeMe2Si)(Me3Si)- CH{PnPr2(BH3)} [14]. The compounds {Cp4MeH)Me2Si}(Me3Si)2CH, (CpH4MeMe2Si)- (Me3Si)CH{PMe2(BH3)} and (CpH4MeMe2Si)(Me3Si)CH{PnPr2(BH3)} crystallise as solvent-free monomers with very similar molecular conformations. The hybrid pro-ligands exhibit variable moisture sensitivity. Reaction of (Me3Si){PMe2(BH3)}CHSiMe2Cl with NaCp followed by aqueous work-up and column chromatography of the oily residue obtained gave the siloxane [(Me3Si){PMe2(BH3)}HCMe2Si]2O [19] and dicyclopentadiene. Reaction of (nPr2P)2CHSiMe2Cl with NaCp followed by aqueous work-up using deoxygenated water gave (nPr2P)2CH2 in quantitative yield. The same reaction avoiding the aqueous work-up gave (CpHMe2Si)CH(PnPr2)2 [33]. Hybrid ligands were prepared by metalation of {Cp4MeH)Me2Si}(Me3Si)2CH, {(Cp’H)Me2Si}(Me3Si)2CH and {(CpH)Me2Si}(Me3Si)2CH with MeK to give the hemisolvated dipotassium salts [(CpMe2Si)(Me3Si)2C]K2(Et2O)0.5 [50], [(Cp4MeMe2Si)(Me3Si)2C]K2(Et2O)0.5 [51] and [(Cp’Me2Si)(Me3Si)2C]K2(C6H6)0.5 [52], which decomposed slowly in THF and toluene. [(Cp4MeMe2Si)(Me3Si)2C]K2(Et2O) [51.Et2O] was crystallised as an alternative solvate from diethyl ether and the v extended structure consists of chelated [(hybrid ligand)K(Et2O)]- anionic units linked nose to tail by unsolvated K cations in a non-linear (zig-zag) polymer chain. [(Cp’Me2Si)(Me3Si)2C]K2(C6H6)·C6H6 [52.C6H6] also crystallised as a monosolvate from benzene, but with addition uncoordinated solvent present in the structure. There are two distinct types of polymer chain in the structure of [(Cp’Me2Si)(Me3Si)2C]K2(C6H6)·C6H6, one is similar to the chain in [(Cp4MeMe2Si)(Me3Si)2C]K2(Et2O) and in the other half the potassium cations in this chain are coordinated by only a cyclopentadienyl ring and a benzene ring. The remainder of the K cations are sandwiched between a carbanion and cyclopentadienyl ring of different hybrid ligands, as in [(Cp4MeMe2Si)(Me3Si)2C]K2(Et2O). These chains are cross-linked by a short contact between K and the –SiMe3 substituent of the Cp’ ring. Due to their more acidic alkyl protons metalation of (CpH4MeMe2Si)(Me3Si)CH{PMe2(BH3)}, (CpH4MeMe2Si)(Me3Si)CH{PnPr2(BH3)} and (CpHMe2Si)CH(PnPr2)2 could be achieved with BnK in THF. (CpH4MeMe2Si)(Me3Si)CH{PMe2(BH3)} is isoelectronic and isosteric with {Cp4MeH)Me2Si}(Me3Si)2CH. [(Cp4MeMe2Si)(Me3Si){PMe2(BH3)}C]K2(THF) [53.THF] crystallises as a solvate from benzene/THF with a 3D polymeric network structure through multiple agostic-type B—H····K contacts. Of the two symmetry inequivalent K cations in the structure the alkyl carbanion interacts directly only with the unsolvated cations and the solvated cations are coordinated through the borane-hydrogens. Metathesis reactions of [(Cp4MeMe2Si)(Me3Si)2C]K2(Et2O)0.5 and [(Cp4MeMe2Si)(Me3Si){PMe2(BH3)}C]K2(THF)0.5 with LaI3(THF) and SmI3(THF) in THF gave [(Cp4MeMe2Si)(Me3Si)2C]LaI(THF)2 [56] and [(Cp4MeMe2Si)(Me3Si){PMe2(BH3)}C]-SmI(THF)2 [57] after extraction into diethyl ether and crystallisation from toluene/THF and diethyl ether respectively. The vi hybrid ligand bound successfully to the lanthanide metal cations. [(Cp4MeMe2Si)(Me3Si)2C]LaI(THF)2 is a monomer in the solid-state, chelated by the hybrid ligand forming pseudo-four-membered ring and two coordinating molecules of THF in addition to the iodine anion. A zwitterion structure is adopted by [(Cp4MeMe2Si)(Me3Si){PMe2(BH3)}C]SmI(THF)3 with no contact between the Sm(III) cation and the alkyl carbanion centre. The hybrid ligands have a much larger cone angle and are far more sterically bulky when chelating the lanthanide metal, as in [(Cp4MeMe2Si)(Me3Si)2C]LaI(THF)2. The metathesis reaction of [(Cp4MeMe2Si)(Me3Si)2C]K2(Et2O)0.5 with CaI2 gave [(Cp4MeMe2Si)(Me3Si){PMe2(BH3)}C]Ca(THF)2 [58] after extraction and crystallisation from diethyl ether. In this structure the phosphine-borane stabilised carbanion group of the hybrid ligand coordinates the Ca cation through the carbanion centre. Synthesis of the Yb(II) analogue, [(Cp4MeMe2Si)(Me3Si){PMe2(BH3)}C]Yb(THF)x gave an almost identical NMR spectrum, but could not be crystallised.
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Böhm, Marcus. "Hybrid ligands in quantum dot solar cells." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708460.

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Joly, Kévin. "Synthesis of novel hybrid cyclopentadienyl-amino acid ligands." Thesis, University of Birmingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.422784.

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Lane, Rhian Jane. "Hybrid phosphine-carbene ligands and their use in homogeneous catalysis." Thesis, Cardiff University, 2005. http://orca.cf.ac.uk/56059/.

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Several chelating phosphine-imidazolium salts have been synthesised and their activity tested in a number of palladium catalysed cross-coupling reactions. The in- situ catalyst testing was carried out using parallel screening techniques and moderate catalytic activity was shown by phosphine-imidazolium salts 2, 6 and 16. A number of synthetic routes have been successfully established which have provided viable paths into three main types of phosphine functionalised imidazolium salts. These methodologies have increased the scope for the potential number of interesting chelating phosphine-imidazolium salts. Several group 10 complexes of these new ligands have been prepared and characterised by the reaction of functionalised nucleophilic heterocyclic carbene's (NHC's), which were generated in-situ and reacted with suitable metal precursors. The solid state structure of complex 1 has been obtained, giving an insight into the properties of these chelating ligands. The relative trans influence of the phosphine and carbene functions have been measured for this bidentate ligand. Following the results of the in-situ catalyst testing, two pre-formed palladium(II) complexes, 1 and 2, were tested in the Heck and Suzuki cross-coupling with the reaction performed under stricter anaerobic conditions with more favourable results. The synthesis of several silver(I) complexes was also achieved by the reaction of phosphine- imidazolium salts with Ag2O3. The preparation of a Rh(I) phosphine-NHC complex was achieved via transmetallation.
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Staniland, Paul M. "Synthesis and characterisation of new complexes with soft donor hybrid ligands." Thesis, Loughborough University, 2007. https://dspace.lboro.ac.uk/2134/10803.

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McGillewie, L. "Identification of novel ligands of WDR47, using yeast two-hybrid analysis." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/3002.

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Thesis (MScMedSc (Biomedical Sciences. Molecular Biology and Human Genetics. Medical Biochemistry))--University of Stellenbosch, 2009.
The mammalian neocortex contributes to the increasing functional complexity of the mammalian brain, partly because of its striking organisation into distinct neuronal layers. The development of the neocortex has been well studied because disrupted neurodevelopment results in several human diseases. The basic principles of neocortical development have been well established for some time; however the molecular mechanisms have only recently been identified. One major advance in our understanding of these molecular mechanisms was the discovery of Reelin, an extracellular matrix protein that directs the migration of neurons to their final positions in the developing neocortex. Reelin is a large multi-domain protein that exerts its functions by binding to its ligands on the cell surface and initiating a signal transduction cascade that ultimately results in cytoskeletal rearrangements. Several investigations have been undertaken to elucidate the functions of each of these domains to gain a better understanding reelin’s functions. We have previously identified the WR40 repeat protein 47 (WDR47), a protein of unknown function, as a novel putative ligand for the N-terminal reeler domain of reelin. To gain better understanding into the functional significance of this interaction, the present study sought to identify novel WDR47- interacting proteins. In order to achieve this, a cDNA encoding a polypeptide that contains the two N-terminal domains of WDR47, i.e. the Lis homology and the C-terminal Lis homology domain (CTLH) was used as bait in a Y2H screen of a foetal brain cDNA library. Putative WDR47 ligands were subsequently verified using 3D in vivo co-localisation. Results of these analyses showed that SCG10, a microtubule destabilizing protein belonging to the stathmin family of proteins, interacted with the N-terminal of WDR47. The identification of SCG10 as a novel WDR47 interacting protein not only sheds some light on the role and function of WDR47 but also aids in a better understanding of the reelin pathway and cortical lamination. Moreover, the data presented here, may also provide researchers with new avenues of research into molecular mechanisms involved in neuronal migration disorders.
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Hu, Liangming. "Inorganic-Organic Hybrid Networks Constructed from Different Metal Ions and Ligands." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/26945.

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Hybrid inorganic-organic networks have been studied in both chemistry and materials science due to properties, (e.g. porosity, magnetic and electronic behaviors) that may lead to applications in catalysis, gas absorption and storage. It is important to understand the different structural topologies shown by hybrid networks to help develop practical applications for these materials. The research is focused on the design and synthesis of well-defined hybrid network structures that have potential to contain molecular size cavities that can be used for catalysis and gas storage. In the field of organic-inorganic hybrid networks, the goals are to design and synthesize 1D, 2D and 3D networks with cavities, and to characterize them by X-ray, TGA and surface area measurements. Twenty-six networks have been successfully made with interesting structure topologies. These hybrid network structures are classified into three series based on their ligands. Series I contains ten hybrid networks constructed from the flexible ligand, 4, 4â -trimethylenedipyridine¬ (TMDP),¬ Zn2+ ions, and H3PO3, and with aromatic alcohols as templates to direct the formation of various hybrid network structures. Series II consists of five structures constructed from the relatively rigid ligand, 4, 4â -bisimidazolelybipyridine (BIB)¬¬ with metal ions (Cu2+, Ni2+) and the conjugated bases of H3PO3 and H3PO4. The BIB ligand is not commercially available so is produced and characterized by NMR, mass spectrometry and TGA. Rigid network structures were expected to construct with pores of molecular dimensions with the BIB ligand. To date, the BIB ligand has not yield the desired porous network, however, these 3D hybrid networks have interesting topologies, one of which is an interdigitated network that is the precursor for 3D interpenetrated networks. Series III contains five hybrid structures constructed from various organic ligands, such as tartaric acid, picolinic acid and 1, 2, 4-triazole. In addition to the hybrid networks, six hydrogen bonded networks were prepared. Graph-Analysis is applied to study these hydrogen bonded network structures. The Ï â ¦.Ï interaction is also discussed within the hydrogen bonded networks.
Ph. D.
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Bajwa, Somia Ehsan. "Hybrid multidentate phosphine-alkene ligands for transition metal coordination chemistry and catalysis." Thesis, University of York, 2012. http://etheses.whiterose.ac.uk/2633/.

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The development of a new class of phosphine-alkene and thio-phosphine-alkene ligands based on a chalcone ferrocene framework, represents the primary focus of this study. The synthesis and characterisation of novel ligands, ferrochalcone 32 and thio-ferrochalcone 33, are described. The related alkene-phosphine ligands, the Lei ligand 17 and novel thio-Lei ligand 46, are further detailed. The coordination chemistry of four ligands (17, 32, 33 and 46) with various transition metals (Pt, Pd, Cu, Rh and Au) has been investigated in a comprehensive spectroscopis study. Single crystal X-ray analysis has been conducted at suitable junctures within the project. A surprising finding was that some solution-state structures were found to be different when studied in the solid state. The AuI complexes-containing the ligands have been successfully used in 1,5-enyne cycloisomerisation reactions. In addition to the coordination chemistry of the novel ligand systems, some interesting findings emerged For example, AuI complex of Lei ligand 17 and monodbaPHOS 74 undergoes an interesting solid-state [2+2] intramolecular cycloaddition transformation, giving cycloadduct, 72 and 77. An interesting finding includes the presence of impurity in commercially available Pd(OAc)2. Cyclopalladation of papaverine was carried out using pure and impure Pd(OAc)2, which resulted in the identification of novel Pd-dimer complex, 86. The result suggest that nitrite contaminants derive from impurities in Pd(OAc)2, and not from the oxidation of acetonitrile mediated by metallic Pd0, explain the formation of PdII-nitrito cyclopalladated products. Photocrystallographic metastable linkage isomerisation and complete conversion to an oxygen-bound nitrito complex 90 was also observed.
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Reiser, Beate [Verfasser], and Tobias [Akademischer Betreuer] Kraus. "Tailored ligands for hybrid materials from colloidal inks / Beate Reiser ; Betreuer: Tobias Kraus." Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2018. http://d-nb.info/1160938687/34.

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Nassar, Roger Abdo. "Coordination of some monodentate and hybrid multidentate phosphine ligands to platinum group metals." Thesis, University of Leicester, 2000. http://hdl.handle.net/2381/30050.

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A range of low-valent late transition-metal triarylphosphine complexes have been prepared and characterised by a combination of 1H, 31P and 19F (as appropriate) NMR and IR spectroscopies and mass spectrometry. Some of these complexes have been isolated as single crystals and characterised by X-ray diffraction. The triarylphosphine ligands used in this study were P(4-CH3OC6H4)3, P(4-HOC6H4)3, P(2-CH3OC6H4)3, PPh2(2-CH3OC6H4), P(2-HOC6H4)3 and PPh2(2-C2H3C6H4) whilst the transition-metals were platinum(II), palladium(II), rhodium(I), rhodium(III), osmium(II) and ruthenium(II). This work has shown that the former four phosphine ligands act as monodentate ligands whilst the last two ligands act as hybrid multidentate ligands. The metal complexes of the ortho-hydroxy substituted ligand exhibit fluxional behaviour in solution, where the phosphine is interchanging between mono- and bi-dentate modes of coordination. In contrast, fluxionality has not been observed in the case of the ortho-vinyl substituted ligand. A set of platinum(II)-, osmium(II)- and ruthenium(II)-fluoride triarylphosphine complexes have been prepared and characterised. The electron-donating substituents in the phosphine strengthen the metal-phosphine and metal fluoride bonds as compared to those for the non-substituted triarylphosphine ligand, PPh3. Furthermore, these substituents affect the geometry at the metal centre in these complexes. In the reactions of P(2-HOC6H4)3 with [Pt(-F){P(4-CH3OC6H4)3}2]2 or [M(-F)F(CO)3]4 (M = Os, Ru), metal chelates are formed by the displacement of fluoride by phenoxide and liberation of HF, whereas, in the related reactions, the ortho-vinyl substituted ligand acted in a monodentate mode.
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Book chapters on the topic "Hybrid ligands"

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Asamitsu, Sefan. "Simultaneous Binding of Hybrid Molecules Constructed with Dual DNA-Binding Components to a G-Quadruplex and Its Proximal Duplex." In Development of Selective DNA-Interacting Ligands, 85–109. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7716-1_4.

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Costantino, Ferdinando, Andrea Ienco, and Marco Taddei. "Hybrid Multifunctional Materials Based on Phosphonates, Phosphinates and Auxiliary Ligands." In Tailored Organic-Inorganic Materials, 193–244. Hoboken, NJ: John Wiley & Sons, Inc, 2015. http://dx.doi.org/10.1002/9781118792223.ch5.

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Schiller, Peter W., Thi M. D. Nguyen, Carole Lemieux, Dennis L. Larson, Guiseppe Ronsisvalle, Akira E. Takemori, and Philip S. Portoghese. "Synthesis and activity profiles of bivalent [Leu5]enkephalin-α-oxymorphamine hybrid opioid receptor ligands." In Peptides, 505–7. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-010-9595-2_151.

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Hedden, David, D. Max Roundhill, Bruce N. Storhoff, and M. Brian Arnold. "Hybrid Tertiary Phosphine Amine and Amide Chelate Ligands: N -[2-(Diphenylphosphino)-Phenyl]Benzamide and 2-(Diphenylphosphino)-N -Phenylbenzamide." In Inorganic Syntheses, 322–26. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132586.ch64.

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Smola, S. S., O. V. Snurnikova, E. N. Fadeyev, and N. V. Rusakova. "Sol–Gel Organic–Inorganic Hybrid Materials Containing Lanthanide Complexes with Polydentate Acyclic and Cyclic Ligands: Synthesis and Spectral-Luminescent Properties." In Springer Proceedings in Physics, 309–25. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-7675-7_21.

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Emel’yanova, Nina, Nataliya Sanina, Alexander Krivenko, Roman Manzhos, Konstantin Bozhenko, and Sergey Aldoshin. "Comparison of pure and hybrid DFT functionals for geometry optimization and calculation of redox potentials for iron nitrosyl complexes with “μ-SCN” bridging ligands." In Highlights in Theoretical Chemistry, 97–104. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-41272-1_12.

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Santos-García, Gustavo, Carolyn Talcott, and Javier De Las Rivas. "Analysis of Cellular Proliferation and Survival Signaling by Using Two Ligand/Receptor Systems Modeled by Pathway Logic." In Hybrid Systems Biology, 226–45. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-26916-0_13.

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Hart, William E., Chris Rosin, Richard K. Belew, and Garrett M. Morris. "Improved Evolutionary Hybrids for Flexible Ligand Docking in AutoDock." In Nonconvex Optimization and Its Applications, 209–29. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4757-3218-4_12.

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Fiaud, J. C., and A. Marinetti. "Approaches to Hybrid Phosphorus–Nitrogen Ligands." In Organophosphorus Compounds (incl. RO-P and RN-P), 1. Georg Thieme Verlag KG, 2009. http://dx.doi.org/10.1055/sos-sd-042-00469.

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Dolles, Dominik, and Michael Decker. "Dual-Acting Compounds Acting as Receptor Ligands and Enzyme Inhibitors." In Design of Hybrid Molecules for Drug Development, 137–65. Elsevier, 2017. http://dx.doi.org/10.1016/b978-0-08-101011-2.00005-2.

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Conference papers on the topic "Hybrid ligands"

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Hasan, Mahmud, Mohamed Akmal Marzouk, Saugat Adhikari, Thomas Wright, Benton Miller, Brianna Peckich, Spencer Yingling, et al. "Abstract 3915: Melatonin-tamoxifen hybrid ligands and their effects on breast cancer." In Proceedings: AACR Annual Meeting 2018; April 14-18, 2018; Chicago, IL. American Association for Cancer Research, 2018. http://dx.doi.org/10.1158/1538-7445.am2018-3915.

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Ravaglia, Marcella, Marco Garavelli, Matthew Polson, Franco Scandola, Theodore E. Simos, and George Maroulis. "Iridium Complexes with Terdentate Ligands: Cyclometalated vs. Polypyridine Analogues; Hybrid vs. “Pure” DFT." In COMPUTATIONAL METHODS IN SCIENCE AND ENGINEERING: Theory and Computation: Old Problems and New Challenges. Lectures Presented at the International Conference on Computational Methods in Science and Engineering 2007 (ICCMSE 2007): VOLUME 1. AIP, 2007. http://dx.doi.org/10.1063/1.2836170.

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Yin, Shichen, Franky So, Shuo Ding, Liping Zhu, Qi Dong, and Carr Hoi Yi Ho. "Enhanced lead sulfide quantum dots infrared photodetector performance through ligand exchange." In Organic and Hybrid Sensors and Bioelectronics XIV, edited by Ruth Shinar, Ioannis Kymissis, and Emil J. List-Kratochvil. SPIE, 2021. http://dx.doi.org/10.1117/12.2603399.

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Atilgan, Emrah, and Jianjun Hu. "Efficient protein-ligand docking using sustainable evolutionary algorithms." In 2010 10th International Conference on Hybrid Intelligent Systems (HIS 2010). IEEE, 2010. http://dx.doi.org/10.1109/his.2010.5600082.

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Tavares, Jorge, Alexandru-Adrian Tantar, Nouredine Melab, and El-Ghazali Talbi. "The Impact of Local Search on Protein-Ligand Docking Optimization." In 2008 8th International Conference on Hybrid Intelligent Systems (HIS). IEEE, 2008. http://dx.doi.org/10.1109/his.2008.14.

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Dou, Letian. "Multi-Functional Conjugated Ligand Engineering for Perovskite Solar Cells and LEDs." In International Online Conference on Hybrid Materials and Optoelectronic Devices. València: Fundació Scito, 2021. http://dx.doi.org/10.29363/nanoge.hybridoe.2021.003.

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Paschoal, Diego F. S., and Joyce H. C. e. Silva. "Relativistic prediction of Pt-195 NMR chemical shift using the NMR- DKH basis sets." In VIII Simpósio de Estrutura Eletrônica e Dinâmica Molecular. Universidade de Brasília, 2020. http://dx.doi.org/10.21826/viiiseedmol2020184.

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Nuclear magnetic resonance (NMR) spectroscopy has played an important role in the discovery and design of new drugs with antitumor potential and the Pt-195 NMR has a fundamental role since the Pt-195 nucleus is very sensitive to the nature of the ligands in the coordination sphere and the oxidation state of the metal. The theoretical prediction of the Pt-195 NMR chemical shift is an extremely difficult task in which several factors must be taken into accounts, such as basis sets, electronic correlation, solvent, and relativistic effects. In an earlier study, Paschoal et al. developed the NMR-DKH basis sets and a nonrelativistic protocol for predicting the Pt-195 NMR chemical shift. The authors studied a set of 258 Pt(II) complexes and obtained a mean absolute deviation (MAD) of 168 ppm and a mean relative deviation (MRD) of 5%. However, relativistic calculations with the NMR-DKH basis sets have not been performed. Thus, the present work aims to apply the NMR-DKH in predicting the Pt-195 NMR chemical shift including the relativistic effects. The cisplatin was used as a model and its geometry was optimized and characterized as a minimum point on the potential energy surface at the B3LYP/LANL2DZ/def2-SVP/COSMO level. The Pt-195 NMR chemical shift was calculated at the DFT-Functional-DKFull/NMR-DKH/COSMO, where the functionals BP86, PBE, BLYP, PBE0, and B3LYP were tested. All calculations were carried out in NWCHEM 7.0.0 program. From the calculated results, it can be observed that the pure GGA functionals showing a better performance when compared to the hybrid functional. The best result was obtained at the BLYP-DKFull/NMR-DKH/COSMO level, where a DAM and DRM of only 34 ppm and 1.6% was found.
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Urban, Joanna, Michal Baranowski, Mateusz Dyksik, Matan Menahem, Alessandro Surrente, Galle Trippé-Allard, Gabriel Chehade, et al. "Magneto-spectroscopy studies provide direct evidence for the coupling of excitons to organic ligand vibrations in 2D RP perovskites." In 13th Conference on Hybrid and Organic Photovoltaics. València: Fundació Scito, 2021. http://dx.doi.org/10.29363/nanoge.hopv.2021.014.

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Olson, Jeremy D., Glenn P. Gray, and Sue A. Carter. "Optimizing Hybrid Nanocrystal/Polymer Photovoltaics Through Ligand Choice." In Solar Energy: New Materials and Nanostructured Devices for High Efficiency. Washington, D.C.: OSA, 2008. http://dx.doi.org/10.1364/solar.2008.swa2.

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Kim, Soo Young, and Ho Won Jang. "Enhancing optical properties and stability of cesium lead halide quantum dots through nickel substitution and ligand change." In Organic and Hybrid Light Emitting Materials and Devices XXV, edited by Tae-Woo Lee, Franky So, and Chihaya Adachi. SPIE, 2021. http://dx.doi.org/10.1117/12.2594024.

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Reports on the topic "Hybrid ligands"

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Morris, Garrett, M., Richard K. Belew, Chris Rosin, and William Eugene Hart. Evolutionary hybrids for flexible ligand docking : (electronic notes). Office of Scientific and Technical Information (OSTI), December 1999. http://dx.doi.org/10.2172/1028898.

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Hodges, Thomas K., and David Gidoni. Regulated Expression of Yeast FLP Recombinase in Plant Cells. United States Department of Agriculture, September 2000. http://dx.doi.org/10.32747/2000.7574341.bard.

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Research activities in both our laboratories were directed toward development of control of the FLP/frt recombination system for plants. As described in the text of the research proposal, the US lab has been engaged in developing regulatory strategies such as tissue-specific promoters and the steroid-inducible activation of the FLP enzyme while the main research activities in Israel have been directed toward the development and testing of a copper-regulated expression of flp recombinase in tobacco (this is an example of a promoter activation by metal ions). The Israeli lab hat additionally completed experiments of previous studies regarding factors affecting the efficiency of recombinase activity using both a gain-of-function assay (excisional-activation of a gusA marker) and loss of function assay (excision of a rolC marker) in tobacco. Site-specific recombinase systems, in particular the FLP/frt and R/RS systems of yeast and the Cre/lox system of bacteriophage P1, have become an essential component of targeted genetic transformation procedures both in animal and plant organisms. To provide more flexibility in transgene excisions by the recombinase systems as well as gene targeting, and to widen possible applications, the development of controlled or regulated recombination systems is highly desirable and was therefore the subject of this research proposal. There are a few possible mechanisms to regulate expression of a recombinase system. They include: 1) control of the recombination system by having the target sites (e.g. frt) in one plant and the flp recombinase gene in another, and bringing the two together by cross fertilization. 2) regulation of promoter activities by external stimuli such as temperature, chemicals, metal ions, etc. 3) regulation of promoter activities by internal signals, i.e. cell- or tissue-specific, or developmental regulation. 4) regulation of enzyme activity by providing cofactors essential for biochemical reactions to take place such as steroid molecules in conjunction with a steroid ligand-binding protein (domains). During the course of this research our major emphasis have been focused toward studying the feasibility of hybrid seed production in Arabidopsis, using FLP/frt. Male-sterility was induced using the antisence of a pollen- and tapetum-specific gene, bcp1, isolated from Arabidopsis. The sterility inducing gene was flanked by frt sites. Upon cross pollination of flowers of male-sterile plants with pollen from FLP-containing plants, viable seeds were produced, and the progeny hybrid plants developed normally. The major achievement from this work is the first demonstration of using a site-specific recombinase to restore fertility in male-sterile plants (see attached paper, Luo et al., Plant J 2000; 23:423-430). The implication from this finding is that site-specific recombination systems can be applied in crop plants as a useful alternative method for hybrid seed production.
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Eyal, Yoram, and Sheila McCormick. Molecular Mechanisms of Pollen-Pistil Interactions in Interspecific Crossing Barriers in the Tomato Family. United States Department of Agriculture, May 2000. http://dx.doi.org/10.32747/2000.7573076.bard.

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During the evolutionary process of speciation in plants, naturally occurring barriers to reproduction have developed that affect the transfer of genes within and between related species. These barriers can occur at several different levels beginning with pollination-barriers and ending with hybrid-breakdown. The interaction between pollen and pistils presents one of the major barriers to intra- and inter-specific crosses and is the focus of this research project. Our long-term goal in this research proposal was defined to resolve questions on recognition and communication during pollen-pistil interactions in the extended tomato family. In this context, this work was initiated and planned to study the potential involvement of tomato pollen-specific receptor-like kinases (RLK's) in the interaction between pollen and pistils. By special permission from BARD the objectives of this research were extended to include studies on pollen-pistil interactions and pollination barriers in horticultural crops with an emphasis on citrus. Functional characterization of 2 pollen-specific RLK's from tomato was carried out. The data shows that both encode functional kinases that were active as recombinant proteins. One of the kinases was shown to accumulate mainly after pollen germination and to be phosphorylated in-vitro in pollen membranes as well as in-vivo. The presence of style extract resulted in dephosphorylation of the RLK, although no species specificity was observed. This data implies a role for at least one RLK in pollination events following pollen germination. However, a transgenic plant analysis of the RLK's comprising overexpression, dominant-negative and anti-sense constructs failed to provide answers on their role in pollination. While genetic effects on some of the plants were observed in both the Israeli and American labs, no clear functional answers were obtained. An alternative approach to addressing function was pursued by screening for an artificial ligand for the receptor domain using a peptide phage display library. An enriched peptide sequence was obtained and will be used to design a peptide-ligand to be tested for its effect o pollen germination and tube growth. Self-incompatibility (SI) in citrus was studied on 3 varieties of pummelo. SI was observed using fluorescence microscopy in each of the 3 varieties and compatibility relations between varieties was determined. An initial screen for an S-RNase SI mechanism yielded only a cDNA homologous to the group of S-like RNases, suggesting that SI results from an as yet unknown mechanism. 2D gel electrophoresis was applied to compare pollen and style profiles of different compatibility groups. A "polymorphic" protein band from style extracts was observed, isolated and micro-sequenced. Degenerate primers designed based on the peptide sequence date will be used to isolate the relevant genes i order to study their potential involvement in SI. A study on SI in the apple cultivar Top red was initiated. SI was found, as previously shown, to be complete thus requiring a compatible pollinator variety. A new S-RNase allele was discovered fro Top red styles and was found to be highly homologous to pear S-RNases, suggesting that evolution of these genes pre-dated speciation into apples and pears but not to other Rosaceae species. The new allele provides molecular-genetic tools to determine potential pollinators for the variety Top red as well as a tool to break-down SI in this important variety.
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