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Journal articles on the topic 'Multidentate ligand systems'

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Published: 18 May 2024

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Kuzu, Istemi, Ivo Krummenacher, Jens Meyer, Felix Armbruster, and Frank Breher. "Multidentate ligand systems featuring dual functionality." Dalton Transactions, no. 43 (2008): 5836. http://dx.doi.org/10.1039/b808347a.

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Wang, Ya Zhen, Chuan Feng Yang, and Jie Chen. "Advances of Chromium(III)-Based Catalysts with Multidentate Heteroatomic Ligands for 1-Hexene Production." Advanced Materials Research 317-319 (August 2011): 1797–800. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.1797.

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According to the various multidentate heteroatomic ligands(based oxygen,nitrogen, phosphorus,mixed N and P,mixed N and S donors, composition, activity and overall selectivity to 1-hexene of chromium-based trimerization catalysts were reviewed. Commercial application foreground of these catalyst systems was also expected.It was found that effect of ligand structure on activity and selectivity for ethylene trimerization was the most predominant.The PNP （(Ph2P)2N(cyclopentyl)）ligands were prepared using inexpensive reagents and gave the corresponding complexes in high yields.Due to the inexpensive ligands coupled with low MAO （methyl aluminum oxide）requirements and high activity and selectivity of these systems, this has positive implication for a commercial process to 1-hexene.

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Harmjanz, Michael, Ingmar M. Piglosiewicz, Brian L. Scott, and Carol J. Burns. "Generation of Spirotricyclic Site-Differentiated Cyclotriphosphazenes: A Solvent-Free Approach to Multidentate N/O Donor Ligand Systems." Inorganic Chemistry 43, no. 2 (January 2004): 642–50. http://dx.doi.org/10.1021/ic034990b.

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Gorshkov, Nikolay I., Andrey Yu Murko, Irina I. Gavrilova, Marina A. Bezrukova, Albert I. Kipper, Valerii D. Krasikov, and Evgenii F. Panarin. "Synthesis of Water-Soluble Copolymers of N-vinylpyrrolidone with N-vinyldithiocarbamate as Multidentate Polymeric Chelation Systems and Their Complexes with Indium and Gallium." Molecules 25, no. 20 (October 14, 2020): 4681. http://dx.doi.org/10.3390/molecules25204681.

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Dithiocarbamate (DTC) derivatives of N-vinylpyrrolidone-N-vinylamine (VP–VA) copolymers were synthesized via reaction between the copolymers and carbon disulfide in alkaline medium; molecular masses of the products were 12 and 29 kDa; the VP:VDTC ratios were 94:6 and 83:17 mol.%. Complexation between the obtained DTC derivatives and metal ions (indium and gallium) was investigated. It was demonstrated that metal–DTC ligand complexes with 1:3 ratio between components were formed. Gallium metal–polymer complexes (MPC) were unstable in solution. Individual indium MPC were isolated and characterized by spectral and chromatographic methods. Unlike similar gallium MPC, they appeared to be stable in histidine challenge reaction.

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Song, Bin, Glen S. Kurokawa, Shuang Liu, and Chris Orvig. "Proton- and lanthanide-coordinating properties of the tetraaza macrocycle (EDDA-KA)2 in aqueous solution." Canadian Journal of Chemistry 79, no. 5-6 (May 1, 2001): 1058–67. http://dx.doi.org/10.1139/v00-179.

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The new potentially multidentate ligand (EDDA-KA)2 has been prepared and its acid-base properties determined. Its coordination properties with three lanthanide ions (La3+, Gd3+, and Lu3+) and Fe3+ have been studied in aqueous solution (I = 0.16 M NaCl, 25°C) by potentiometric pH, spectrophotometric, and 1H NMR titrations. In total, eight pKa values could be determined by these diverse methods. From the 1H NMR titrations, all the deprotonation steps could be determined and assigned (in groups). Strong hydrogen bonding among two nitrogen atoms and one oxygen atom on the pyrone ring was observed, and the corresponding pKa values were estimated to be 13.2 and 14.0. By comparison with similar systems, an equilibrium constant for the formation of the hydrogen bond was estimated, KI = 104.4. Eight stability constants in total were determined for various protonation states of the La3+ and Gd3+ complexes, but for Lu3+ only the last four constants were obtained. The species distribution diagram showed that [M(EDDA-KA)2-4H]2- predominated in the range 5 [Formula: see text] pH [Formula: see text] 9 and [M(EDDA-KA)2-6H]4- predominated in the region 9 [Formula: see text] pH [Formula: see text] 11. In the former complex, two strong hydrogen bonds anchored the macrocycle and Ln3+ was coordinated with the four carboxylate groups; in the latter, the two hydrogen bonding protons were absent and the metal ion might also bind to the nitrogens on the macrocycle. The stability of Gd3+-(EDDA-KA)2 is lower than the analogous Gd3+ complexes of DOTA, DTPA, and DTPA-BMA.Key words: acidity constants, stability constants, La3+, Gd3+, Lu3+, Fe3+, amino carboxylate chelator.

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Motekaitis, R. J., and A. E. Martell. "METAL ION SPECIATION IN COMPLEX MULTICOMPONENT SYSTEMS. SIX METAL IONS AND FIVE MULTIDENTATE LIGANDS." Journal of Coordination Chemistry 14, no. 1 (May 1985): 49–55. http://dx.doi.org/10.1080/00958978508080677.

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Belikov, Кonstantin, Ekateryna Bryleva, Zinaida Bunina, Victoria Varchenko, Anna Andryushchenko, Ilias Shcherbakov, Vitaliy Kalchenko, Andriy Drapailo, Alexander Zontov, and Larysa Zontova. "SOLID PHASE EXTRACTANTS BASED ON POROUS POLYMERS IMPREGNATED WITH MULTIDENTATE CHELATING LIGANDS FOR ACTINIDE AND LANTHANIDE REMOVAL." Science and Innovation 17, no. 2 (April 27, 2021): 64–71. http://dx.doi.org/10.15407/scine17.02.064.

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Introduction. Treatment and disposal of radioactive wastes as well as monitoring of radioactive isotope content in environmental objects are actual tasks in the developed world. Lanthanide and transuranium element removal from spent nuclear fuel of nuclear power plants allows decreasing waste amount to be dumped and diminishing the risk of environmental pollution by radionuclides. Problem Statement. Considering extreme radiotoxicity of transuranium elements and tight standards restricting their activity in air and water, there is an urgent need to develop accurate and highly sensitive methods for pollution control. Purpose. Development of solid phase extractants (SPEs) based on porous polymers impregnated with multidentate chelating ligands for lanthanide, uranium and transuranium element removal from aqueous solutions. Materials and Methods. The materials used are porous divinylbenzene polymers of POROLAS brand and styrene-divinylbenzene copolymers from Smoly SE (Kamianske); multidentate chelating ligands of actinides and lanthanides such as N,N,N´,N´-tetra-n-octyl-oxapentane-1,5-diamide (TODGA) and carbamoyl phosphine oxides (CMPO); sorbent from TrisKem (France) based on TRU Resin (Eichrom Industries, Inc.). The research techniques are inductively coupled plasma atomic emission spectrometry, IR spectroscopy, scanning electron spectroscopy, spectrofluorimetry. Results. The solid-phase extractants (SPEs) for actinide and lanthanide removal from aqueous solutions have been synthesized by impregnation of porous polymeric POROLAS matrices and TODGA, CMPO-(PhOct) and CMPO-(Ph2). Sorption kinetics has been studied and capacity values for the different sorbents have been estimated. Extractive columns for uranium and europium concentration have been manufactured. Conclusions. SPEs studied demonstrate a high efficiency in removing uranium and europium from aqueous solutions. Due to their characteristics obtained materials may be used for preconcentration of target ions in radioecologycal monitoring procedures.

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Hołyńska, Małgorzata, Rodolphe Clérac, and Mathieu Rouzières. "Lanthanide Complexes with Multidentate Oxime Ligands as Single-Molecule Magnets and Atmospheric Carbon Dioxide Fixation Systems." Chemistry - A European Journal 21, no. 38 (July 31, 2015): 13321–29. http://dx.doi.org/10.1002/chem.201501824.

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Stepniak-Biniakiewicz, Danuta, Baohe Chen, and Edward Deutsch. "A new, general synthetic route to multidentate N,S ligands for use in technetium-99m radiopharmaceuticals. Preparation of diamido disulfur, diamino dithiol, and tripodal N3S3 prototypes. Comparative biodistributions of [99mTcVO-DADS]- analogs which contain 5,5,5- and 5,7,5-membered chelate ring systems." Journal of Medicinal Chemistry 35, no. 2 (January 1992): 274–79. http://dx.doi.org/10.1021/jm00080a011.

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Kuzu, Istemi, Ivo Krummenacher, Jens Meyer, Felix Armbruster, and Frank Breher. "ChemInform Abstract: Multidentate Ligand Systems Featuring Dual Functionality." ChemInform 40, no. 10 (March 10, 2009). http://dx.doi.org/10.1002/chin.200910226.

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Meinema, Harry A., Klaas Timmer, Hans L. Linden, and Carel I. M. A. Spee. "Synthetic Strategies for MOCVD Precursors for HTcS Thin Films." MRS Proceedings 335 (1993). http://dx.doi.org/10.1557/proc-335-193.

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AbstractIn recent years much attention has been given world-wide to the development of suitable MOCVD precursors for the deposition of HTcS thin films. Synthetic research has been and is concentrated on the development of superior Ba-, Sr-, Ca- and Y-precursors. Most emphasis is given to the synthesis of thermally stable volatile barium compounds. Synthetic strategies are based on encapsulating the central metal atom, by use of multidentate ligand systems and/or bulky substituents. Most attention is given to the development of thermally stable volatile ß-diketonate complexes, fluorine-free and fluorine-substituted, with auxiliary ligands. Thermally stable monomeric complexes of fluorine-substituted ß-diketonates with polyethers are by far the most volatile Ba-, Sr-, and Ca-precursors presently available. Low melting Y(thd)3.L complexes where L is 4-Et- or 4-t-Bupyridine- N-oxide can be used as liquid yttrium MOCVD precursors at temperatures above 100°C. This paper gives a survey of the trends in recent research activity and developments in these areas.

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Zhong, I.-IM Stephanie, Wui Ip, Alice Pak, Jin Luo, and Chuan-Jian Zhong. "A Kinetic Study of Mediator-Template Assembly of Gold Nanoparticles." MRS Proceedings 900 (2005). http://dx.doi.org/10.1557/proc-0900-o08-07.

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ABSTRACTThis paper describes a kinetic study of the mediator-template assembly of gold nanoparticles in solutions based on the spectrophotometric measurement of the surface plasmon resonance optical property. Gold nanoparticles of ∼5 nm diameter encapsulated with tetraoctylammonium bromide shells were studied as a model system. The core-shell nanoparticles were assembled into 3D spherical assemblies via a mediator-template assembly route in which a thioether-based multidentate ligand functions as a mediator and the tetraoctylammonium shell molecules function as a templating agent. In this report, the results were compared with those obtained for the assembly of gold nanoparticles in several different systems with features similar to the mediator-template assembly. The findings further provided further insights into understanding the kinetic factors governing the assembly of nanoparticles, and have important implications to the design and control of the nanostructures for sensory and catalytic applications.

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Toftlund, Hans, and John J. McGarvey. "Iron(II) Spin Crossover Systems with Multidentate Ligands." ChemInform 36, no. 21 (May 24, 2005). http://dx.doi.org/10.1002/chin.200521236.

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Karmakar, Shiladitya, Pradip Chakraborty, and Tanusri Saha-Dasgupta. "Trend in light-induced excited-state spin trapping in Fe(ii)-based spin crossover systems." Physical Chemistry Chemical Physics, 2022. http://dx.doi.org/10.1039/d2cp00539e.

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A computational study of the light-induced excited spin-state trapping (LIESST) in a number of Fe(ii) spin crossover complexes, coordinated by monodentate, bidentate and multidentate ligands is carried out, with the goal to uncover the trend in the low temperature relaxation rate.

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Mandal, Paritosh, and Jahar L. Pratihar. "A review on the chemistry of novel platinum chelates based on azo-azomethine ligands." Reviews in Inorganic Chemistry, November 4, 2022. http://dx.doi.org/10.1515/revic-2022-0027.

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Abstract Numerous platinum group metals (PGMs) complexes contain azo-azomethine-based ligands. Azo-azomethine ligands are N-donor ligands that have extended conjugated π-bonded systems and both azo (–N=N–) and aldimine (–C=N–) functions in their structure. Plenty of platinum (Pt) complexes with azo-imine ligands have been prepared and characterized. Various multidentate azo-imine ligands coordinated with different platinum metal substrates afforded structurally diverse platinum chelates. Nonetheless, many azo-imine-based platinum complexes demonstrated a wide range of biological activities, photo-switchable properties, and redox activities. The review encompasses a general overview of platinum complexes with versatile azo-azomethine ligands, their synthetic protocol, spectroscopic and structural features, chemical reactivity, and multipurpose applications in different areas.

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