Articoli di riviste: "Ditopic ligand"

1

Jouvenot, Damien, Edith C. Glazer e Yitzhak Tor. "Photodimerizable Ditopic Ligand". Organic Letters 8, n. 10 (maggio 2006): 1987–90. http://dx.doi.org/10.1021/ol060253i.

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Bonanno, N. M., A. J. Lough, K. E. Prosser, C. J. Walsby, P. K. Poddutoori e M. T. Lemaire. "A stable open-shell redox active ditopic ligand". Dalton Transactions 45, n. 13 (2016): 5460–63. http://dx.doi.org/10.1039/c5dt04061b.

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Hayvali, Zeliha, Necla Gündüz, Zeynel Kilic e Edwin Weber. "Synthesis, Complex Formation and Spectral Investigation of New Tritopic Bis(Crown Ether) Compounds Containing Recognition Sites for Sodium and Nickel Guest Cations*". Zeitschrift für Naturforschung B 55, n. 10 (1 ottobre 2000): 975–81. http://dx.doi.org/10.1515/znb-2000-1015.

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AbstractNew bis(crown ether) ligands (1 - 3) of Schiff base type containing recognition sites for sodium and nickel guest cations have been synthesized by the condensation of two equivalents of 4′-formyl-5′-hydroxy(benzo-15-crown-5)with 1,5-diamino-3-azapentane, 1,8-diamino-3,6- diazaoctane or 1,8-diamino-3,6-dioxaoctane. Homonuclear ditopic crystalline 2:1 (Na+:ligand) complexes (1a - 3a) of the ligands with NaClO4 have been prepared. Heteronuclear tritopic crystalline 2:1:1 (Na⊕ : Ni2⊕ : ligand) complexes (2b and 3b) have also been synthesized from the reactions of the ditopic complexes (2a and 3a) with Ni(CH3COO)2 · 6H2O. The UV-VIS spectra of 1 - 3, their sodium complexes 1a - 3a and sodium-nickel complexes 2b and 3b have been recorded in polar and non-polar solvents as well as in acidic and basic media. In polar solvents and basic solutions, tautomeric equilibria (phenol-imine and keto-amine forms, O-H···N⇌O···H-N ) are present, depending on the hydrogen bonding. The results indicate that the concentrations of the keto forms of the compounds generally increase as the polarity of the solvent increases

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Kariuki, Benson M., James A. Platts e Paul D. Newman. "A hybrid bipy–NHC ligand for the construction of group 11 mixed-metal bimetallic complexes". RSC Advances 11, n. 54 (2021): 34170–73. http://dx.doi.org/10.1039/d1ra06581e.

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Duerrbeck, Andre, Sergey Gorelik, Jonathan Hobley, Ji'En Wu, Andy Hor e Nicholas Long. "Highly emissive, solution-processable and dynamic Eu(iii)-containing coordination polymers". Chemical Communications 51, n. 41 (2015): 8656–59. http://dx.doi.org/10.1039/c5cc01793a.

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Soldevila-Sanmartín, Joan, Teresa Calvet, Merce Font-Bardia, Concepción Domingo, José A. Ayllón e Josefina Pons. "Modulatingp-hydroxycinnamate behavior as a ditopic linker or photoacid in copper(ii) complexes with an auxiliary pyridine ligand". Dalton Transactions 47, n. 18 (2018): 6479–93. http://dx.doi.org/10.1039/c8dt00645h.

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Bonanno, Nico M., Zackery Watts, Cole Mauws, Brian O. Patrick, Christopher R. Wiebe, Yuki Shibano, Kenji Sugisaki et al. "Valence tautomerism in a [2 × 2] Co4 grid complex containing a ditopic arylazo ligand". Chemical Communications 57, n. 50 (2021): 6213–16. http://dx.doi.org/10.1039/d1cc01991k.

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8

Renard, Nicolas, Eric Brenner, Dominique Matt e Christophe Gourlaouen. "Adaptive Behavior of a Ditopic Phosphine Ligand". European Journal of Inorganic Chemistry 2019, n. 25 (27 giugno 2019): 2996–3004. http://dx.doi.org/10.1002/ejic.201900571.

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9

Hossain, Sayed Muktar, Avinash Lakma, Rabindra Nath Pradhan, Serhiy Demeshko e Akhilesh Kumar Singh. "Valence directed binding mode of [2 × 2] iron grids of an unsymmetrical picolinic hydrazone based ligand". Dalton Transactions 46, n. 37 (2017): 12612–18. http://dx.doi.org/10.1039/c7dt02433a.

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Blanco-Gómez, Arturo, Tamara Rama, Olaya Domarco, Iago Neira, Víctor Blanco, José M. Quintela, Marcos D. García e Carlos Peinador. "Amplification of a metallacyclic receptor out of a dynamic combinatorial library". Dalton Transactions 46, n. 45 (2017): 15671–75. http://dx.doi.org/10.1039/c7dt03379f.

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We present herein the Pt(ii)-directed self-assembly in water of a new conformationally flexible N-monoalkyl-4,4-bipyridinium-based ditopic ligand into a library of six different metallacyclic structures.

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Viveke, A. Arun, e V. Alexander. "pH-responsive luminescence of a new trinuclear Ru(ii) polypyridine complex". RSC Adv. 4, n. 83 (2014): 44269–73. http://dx.doi.org/10.1039/c4ra07077a.

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Synthesis of a new heteroleptic trinuclear Ru(ii) complex of a ditopic imidazole-based terpyridine bridging ligand and its room temperature luminescence in fluid solution and pH modulated luminescence behaviour is reported.

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Salimova, I. O., A. V. Berezina, A. A. Moiseeva, D. A. Skvortsov, M. A. Sukonnikov, N. V. Zyk e E. K. Beloglazkina. "Terpyridine-containing 5-(2-pyridylmethylene)-2-thioimidazolones and their coordination compounds with copper(II) chloride: synthesis and cytotoxicity". Журнал общей химии 93, n. 8 (15 agosto 2023): 1261–73. http://dx.doi.org/10.31857/s0044460x23080115.

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Methods for the synthesis of new ditopic organic ligands containing coordinating fragments of two types, terpyridine and thiohydantoin, have been developed. The synthesized ligands were studied in complex formation reactions with copper(II) chloride. As a result, two types of coordination compounds were isolated and characterized by electron spectroscopy, elemental analysis, and cyclic voltammetry: bis-ligand tetranuclear mixed-valent complexes of copper(I, II) and a monoligand binuclear complex containing two copper(II) ions. The cytotoxic activity of the obtained coordination compounds with respect to the MCF7, A549, and HEK293 cell lines was studied.

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13

Shafikov, Marsel Z., Craig Hodgson, Aleksander Gorski, Aleksandra Kowalczyk, Magdalena Gapińska, Konrad Kowalski, Rafał Czerwieniec e Valery N. Kozhevnikov. "Benzannulation of a ditopic ligand to afford mononuclear and dinuclear Ir(iii) complexes with intense phosphorescence: applications in singlet oxygen generation and bioimaging". Journal of Materials Chemistry C 10, n. 5 (2022): 1870–77. http://dx.doi.org/10.1039/d1tc05271c.

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Benzannulation of a ditopic ligand affords a significant phosphorescence blue-shift and enhanced emission quantum yield of mono- and dinuclear Ir(iii) complexes. The complexes are excellent oxygen photosensitizers. A use in bioimaging is reported.

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14

Barry, Dawn E., Chris S. Hawes, Joseph P. Byrne, Bjørn la Cour Poulsen, Manuel Ruether, John E. O'Brien e Thorfinnur Gunnlaugsson. "A folded [2 × 2] metallo-supramolecular grid from a bis-tridentate (1,2,3-triazol-4-yl)-picolinamide (tzpa) ligand". Dalton Transactions 46, n. 19 (2017): 6464–72. http://dx.doi.org/10.1039/c7dt01533j.

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A flexible ditopic ligand 1 containing two N,N,O-tridentate (1,2,3-triazol-4-yl)-picolinamide chelating pockets is reported and the formation of multimetallic architectures is explored in the solid and the solution phase.

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15

Ali, Mohammad Akbar, Paul V. Bernhardt, Chong Lee Kiem e Aminul Huq Mirza. "Self-Assembly of a Charge-Neutral Molecular Square". Australian Journal of Chemistry 57, n. 5 (2004): 409. http://dx.doi.org/10.1071/ch03319.

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Complexation of cadmium(II) by the ditopic (bis-tridentate) thiocarbazone ligand 1,5-bis(6-methyl-2-pyridyl- methylene)thiocarbonohydrazide, H2L1, results in the self-assembly of a charge-neutral 2 × 2 molecular grid, [Cd4(L1)4], comprising four metals and four ligands in an interlocked cyclic array. The solid-state structure of this tetramer has been established by X-ray crystallography and in solution by 1H NMR spectroscopy. The presence of lower molecular weight oligomers was identified by both NMR and ESI-MS.

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16

Baylies, Christian J., T. Riis-Johannessen, Lindsay P. Harding, John C. Jeffery, Ryan Moon, Craig R. Rice e Martina Whitehead. "Allosteric-Controlled Metal Specificity of a Ditopic Ligand". Angewandte Chemie 117, n. 42 (28 ottobre 2005): 7069–72. http://dx.doi.org/10.1002/ange.200502571.

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Baylies, Christian J., Lindsay P. Harding, John C. Jeffery, T. Riis-Johannessen e Craig R. Rice. "Allosteric and Electrostatic Reprogramming of a Ditopic Ligand". Angewandte Chemie International Edition 43, n. 34 (27 agosto 2004): 4515–18. http://dx.doi.org/10.1002/anie.200460424.

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Baylies, Christian J., T. Riis-Johannessen, Lindsay P. Harding, John C. Jeffery, Ryan Moon, Craig R. Rice e Martina Whitehead. "Allosteric-Controlled Metal Specificity of a Ditopic Ligand". Angewandte Chemie International Edition 44, n. 42 (28 ottobre 2005): 6909–12. http://dx.doi.org/10.1002/anie.200502571.

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19

Baylies, Christian J., Lindsay P. Harding, John C. Jeffery, T. Riis-Johannessen e Craig R. Rice. "Allosteric and Electrostatic Reprogramming of a Ditopic Ligand". Angewandte Chemie 116, n. 34 (27 agosto 2004): 4615–18. http://dx.doi.org/10.1002/ange.200460424.

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20

Shafikov, Marsel Z., Alfiya F. Suleymanova, Roger J. Kutta, Alexander Gorski, Aleksandra Kowalczyk, Magdalena Gapińska, Konrad Kowalski e Rafał Czerwieniec. "Ligand design and nuclearity variation towards dual emissive Pt(ii) complexes for singlet oxygen generation, dual channel bioimaging, and theranostics". Journal of Materials Chemistry C 10, n. 14 (2022): 5636–47. http://dx.doi.org/10.1039/d2tc00257d.

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Mono- and dinuclear Pt(ii) complexes of a new ditopic ligand with a thiophene cyclometalating core are reported. The mononuclear complex shows dual emission of fluorescence and phosphorescence and is demonstrated as a dual channel bioimaging probe.

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21

Coulton, John B., Aramis C. Smith, Kraig A. Wheeler e Radu F. Semeniuc. "Multiple coordination modes of a new ditopic bis(pyrazolyl)methane-based ligand". Dalton Transactions 47, n. 47 (2018): 17109–21. http://dx.doi.org/10.1039/c8dt03992e.

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22

Stefanelli, Manuela, Donato Monti, Valeria Van Axel Castelli, Gianfranco Ercolani, Mariano Venanzi, Giuseppe Pomarico e Roberto Paolesse. "Chiral supramolecular capsule by ligand promoted self-assembly of resorcinarene-Zn porphyrin conjugate". Journal of Porphyrins and Phthalocyanines 12, n. 12 (dicembre 2008): 1279–88. http://dx.doi.org/10.1142/s1088424608000662.

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Cavitand- Zn porphyrin conjugates self-assemble to give supramolecular (1 + 1) structures upon coordination of bifunctional ligands such as 4,4'-bipyridine and the like. The formation of the capsule depends on key structural factors, such as the size of the cavity, and the possibility of the onset of hydrogen bonds, π–π and π–cation interactions. The extension of this protocol to chiral bifunctional ligands, such as (+)-cinchonine and (−)-cinchonidine, and cinchona alkaloid derivatives, results in the achievement of supramolecular structures with chiral cavities, whose configuration is dependent on the asymmetry of the bound ditopic ligand. MM calculations, gave further insights into the plausible geometry of the structures.

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Tripathi, Sarita, Renganathan Srirambalaji, Samir Patra e Ganapathi Anantharaman. "Anion triggered and solvent assisted structural diversity and reversible single-crystal-to-single-crystal (SCSC) transformation between 1D and 2D coordination polymers". CrystEngComm 17, n. 46 (2015): 8876–87. http://dx.doi.org/10.1039/c5ce00690b.

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Synthesis of four new coordination polymers (CPs) 1–4 from angular ditopic ligand 2,6-bis(imidazol-1-yl)pyridine (pyim₂) and the anion triggered structural variation (1D and 2D)under different solvent conditions have been reported.

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Zibaseresht, Ramin, Alan M. Downward e Richard M. Hartshorn. "Coordination Chemistry of Some Terpyridyl-Polyamine Bridging Ligands". Australian Journal of Chemistry 63, n. 4 (2010): 669. http://dx.doi.org/10.1071/ch09478.

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A series of ditopic ligands bearing terpyridyl and polyamine coordination sites have been prepared. Complexes with RuII bound to the terpyridyl sites of many of these ligands have been prepared. RuII complexes of these ligands appear vulnerable to nucleophilic displacement of the polyamine portion of the ligand by BH4 –. A limited study of the coordination chemistry of the polyamine portion of the RuII complexes has been conducted, including the synthesis and characterization of RuII–CoIII heterodinuclear complexes in which the CoIII centre is coordinated by a cyclam macrocycle. The CoIII centre in these systems is unexpectedly labile – it can be removed from the polyamine upon treatment with ethane-1,2-diamine.

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Sanmartín-Matalobos, Jesus, Matilde Fondo, Ana M. García-Deibe, Martín Amoza, Pilar Bermejo, M. Raquel Domínguez, Antonio J. Mota, J. Luis Pérez-Lustres, Sourav Bhowmick e Neeladri Das. "Zinc-mediated diastereoselective assembly of a trinuclear circular helicate". RSC Advances 6, n. 25 (2016): 21228–34. http://dx.doi.org/10.1039/c6ra01783e.

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We have designed a triptycene-based ditopic ligand H₂L, which is able to adopt an adequate topology required for optimal binding to naked Zn²⁺ leading to a neutral trinuclear circular helicate Zn₃L₃.

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Imen, Hnid, Sun Xiaonan, Frath Denis, Lafolet Frédéric e Lacroix Jean-Christophe. "Multi-functional switches of ditopic ligands with azobenzene central bridges at a molecular scale". Nanoscale 11, n. 47 (2019): 23042–48. http://dx.doi.org/10.1039/c9nr06350a.

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This paper reports multi-functional switches from a ditopic ligand bpy-azo-bpy. The molecule can adopt a cis-to-trans isomerization at the bipyridine terminals and can switch between their TRANS and CIS configurations at the central azobenzene unit by protonation or by light irradiation.

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D’Vries, Richard F., Germán E. Gomez e Javier Ellena. "Highlighting Recent Crystalline Engineering Aspects of Luminescent Coordination Polymers Based on F-Elements and Ditopic Aliphatic Ligands". Molecules 27, n. 12 (14 giugno 2022): 3830. http://dx.doi.org/10.3390/molecules27123830.

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Three principal factors may influence the final structure of coordination polymers (CPs): (i) the nature of the ligand, (ii) the type and coordination number of the metal center, and (iii) the reaction conditions. Further, flexible carboxylate aliphatic ligands have been widely employed as building blocks for designing and synthesizing CPs, resulting in a diverse array of materials with exciting architectures, porosities, dimensionalities, and topologies as well as an increasing number of properties and applications. These ligands show different structural features, such as torsion angles, carbon backbone number, and coordination modes, which affect the desired products and so enable the generation of polymorphs or crystalline phases. Additionally, due to their large coordination numbers, using 4f and 5f metals as coordination centers combined with aliphatic ligands increases the possibility of obtaining different crystal phases. Additionally, by varying the synthetic conditions, we may control the production of a specific solid phase by understanding the thermodynamic and kinetic factors that influence the self-assembly process. This revision highlights the relationship between the structural variety of CPs based on flexible carboxylate aliphatic ligands and f-elements (lanthanide and actinides) and their outstanding luminescent properties such as solid-state emissions, sensing, and photocatalysis. In this sense, we present a structural analysis of the CPs reported with the oxalate ligand, as the one rigid ligand of the family, and other flexible dicarboxylate linkers with –CH2– spacers. Additionally, the nature of the luminescence properties of the 4f or 5f-CPs is analyzed, and finally, we present a novel set of CPs using a glutarate-derived ligand and samarium, with the formula [2,2′-bipyH][Sm(HFG)2 (2,2′-bipy) (H2O)2]•(2,2′-bipy) (α-Sm) and [2,2′-bipyH][Sm(HFG)2 (2,2′-bipy) (H2O)2] (β-Sm).

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Zibaseresht, Ramin, e Richard M. Hartshorn. "Coordination chemistry of a terpyridine-tris(pyrazolyl) ditopic ligand". Dalton Transactions, n. 24 (2005): 3898. http://dx.doi.org/10.1039/b509324d.

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Pettinari, Claudio, Aurel Tăbăcaru, Ishtvan Boldog, Konstantin V. Domasevitch, Simona Galli e Norberto Masciocchi. "Novel Coordination Frameworks Incorporating the 4,4′-Bipyrazolyl Ditopic Ligand". Inorganic Chemistry 51, n. 9 (18 aprile 2012): 5235–45. http://dx.doi.org/10.1021/ic3001416.

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Li, Feng, Natasha F. Sciortino, Jack K. Clegg, Suzanne M. Neville e Cameron J. Kepert. "Self-Assembly of an Octanuclear High-Spin FeII Molecular Cage". Australian Journal of Chemistry 67, n. 11 (2014): 1625. http://dx.doi.org/10.1071/ch14404.

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A discrete octanuclear high-spin FeII cage [Fe8L12](BF4)16·n(solvent) was synthesised via metal ion-directed self-assembly. The cage formation is facilitated by incorporating a relatively flexible ditopic ligand with chelating pyrazolyl–pyridine functional units. The synthesis, structure, and magnetic properties of this metallo-cage are presented.

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Zeng, Yunting, Junjuan Shi, Kehuan Li, Jiaqi Li, Hao Yu, Fang Fang, Xin-Qi Hao, Houyu Zhang e Ming Wang. "Coordination-driven [2+2] metallo-macrocycles isomers: conformational control and photophysical properties". Chemical Synthesis 2, n. 2 (2022): 12. http://dx.doi.org/10.20517/cs.2022.11.

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In recent years, fluorescent supramolecular materials have received significant attention due to their wide application prospects. However, the relationship between the conformation of supramolecules and their photophysical properties remains an open question. In this study, two rhomboidal metallacycle isomers, SA and SB, self-assembled with trans- and cis-isomers of tetraphenylethylene-based ditopic pyridyl ligands (LA and LB), and a 120° di-platinum (II) acceptor were prepared. Compared with metallacycle SB constructed by cis- tetraphenylethylene (TPE)-based ligand LB, the curved rhomboidal metallacycle SA constructed with trans-TPE-based ligand LA can restrict molecular motions of the aromatic groups on TPE and exhibits better light-emitting properties. Moreover, curved SA also exhibited better fluorescence stability than isomer SB towards molecules with strongly electron-withdrawing groups. This work provides a new platform to explore the relationship between conformation and the corresponding photophysical properties.

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Francesconi, Oscar, Matteo Gentili, Francesco Bartoli, Andrea Bencini, Luca Conti, Claudia Giorgi e Stefano Roelens. "Phosphate binding by a novel Zn(ii) complex featuring a trans-1,2-diaminocyclohexane ligand. Effective anion recognition in water". Organic & Biomolecular Chemistry 13, n. 6 (2015): 1860–68. http://dx.doi.org/10.1039/c4ob02321h.

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Excellent affinities and selectivities toward triphosphates are achieved through an adaptive ditopic receptor featuring a metal ion and a macrocyclic polyammonium cation binding sites, concertedly bridging phosphate anions.

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Ding, Xin, Matti Tuikka, Kari Rissanen e Matti Haukka. "Extended Assemblies of Ru(bpy)(CO)2X2 (X = Cl, Br, I) Molecules Linked by 1,4-Diiodotetrafluoro-Benzene (DITFB) Halogen Bond Donors". Crystals 9, n. 6 (24 giugno 2019): 319. http://dx.doi.org/10.3390/cryst9060319.

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The ruthenium carbonyl compounds, Ru(bpy)(CO)2X2 (X = Cl, Br or I) act as neutral halogen bond (XB) acceptors when co-crystallized with 1,4-diiodotetrafluoro-benzene (DITFB). The halogen bonding strength of the Ru-X⋅⋅⋅I halogen bonds follow the nucleophilic character of the halido ligand. The strongest halogen bond occurs between the chlorido ligand and the iodide atoms of the DITFB. All three halogen bonded complexes form polymeric assemblies in the solid state. In Ru(bpy)(CO)2Cl2⋅DITFB (1) and in Ru(bpy)(CO)2Br2⋅DITFB (2) both halido ligands are halogen bonded to only one DITFB donor. In Ru(bpy)(CO)2I2⋅DITFB (3) only one of the halido ligands is involved in halogen bonding acting as ditopic center for two DITFB donors. The polymeric structures of 1 and 2 are isomorphic wave-like single chain systems, while the iodine complexes form pairs of linear chains attached together with weak F⋅⋅⋅O≡C interactions between the closest neighbors. The stronger polarization of the iodide ligand compared to the Cl or Br ligands favors nearly linear C-I⋅⋅⋅I angles between the XB donor and the metal complex supporting the linear arrangement of the halogen bonded chain.

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Kim, Tae Kyung, Kyung Joo Lee, Min Choi, Noejung Park, Dohyun Moon e Hoi Ri Moon. "Metal–organic frameworks constructed from flexible ditopic ligands: conformational diversity of an aliphatic ligand". New Journal of Chemistry 37, n. 12 (2013): 4130. http://dx.doi.org/10.1039/c3nj00812f.

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Saladi, Rama Krishna, Shyamala Pulipaka e Satyanarayana Atreyapu. "Chemical Modelling Potentiometric Study on the Complex Formation of Ditopic Sebacic Acid Dihydrazide with Co2+ and Ni2+in Aqueous Medium". Research Journal of Chemistry and Environment 27, n. 12 (5 novembre 2023): 180–86. http://dx.doi.org/10.25303/2712rjce1800186.

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Binary proton-ligand as well as metal-ligand equilibria of Sebacicdicarboxylic acid dihydrazide (L) with Co2+and Ni2+were studied by pH-potentiometric method at 30 0C and I=0.1M (NaCl). Sebacic acid dihydrazide is an aliphatic polydentate ditopic ligand that can bind metal ions through two hydrazide groups present at the ends of a long linear –(CH2)8- hydrocarbon chain. This enables the ligand to form both mononuclear and binuclear species. The potentiometric data acquired were analysed chemometrically using the Miniquad-75 program. The complexes that converged include protonated (MLH, ML2H and ML2H2) and deprotonated forms (MLH-1 and ML2H-1) along with the simple unprotonated ML and ML2 types. The formation of homo-binuclear species of type M2L and M2LH-1 was also noticed.

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Zibaseresht, Ramin. "Efficient synthesis of a new ditopic bipyridine–terpyridine bridging ligand". Synthetic Communications 50, n. 6 (18 febbraio 2020): 904–15. http://dx.doi.org/10.1080/00397911.2020.1725576.

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Khutia, Anupam, Pablo J. Sanz Miguel e Bernhard Lippert. "Molecular Architectures Derived from Metal Ions and the Flexible 3,3′-Bipyridine Ligand: Unexpected Dimer with Hg(II)". Bioinorganic Chemistry and Applications 2010 (2010): 1–8. http://dx.doi.org/10.1155/2010/169054.

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The flexible ditopic ligand 3,-bipyridine (3,-bpy) has been reacted with a series of transition metal species (A, H, cis- ( or ; ), trans- ()) in an attempt to produce discrete cyclic constructs. While A gave a polymeric structure [Ag(3,-bpy)](Cl) (1), with all other metal entities cyclic structures were formed. Interestingly, Hg(CCOO produced a dinuclear complex [Hg(3,-bpy)(CCOO 3O (2), in which the two 3,-bpy ligands adopt a cis-orientation of the coordinating pyridyl entities. With cis-(, a cyclic complex4was isolated in crystalline form which, according to HRMS, is a trimer. With trans-(, different species are formed according to NMR spectroscopy, the nature of which was not established.

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Sugiyama, Junya, Yusuke Umemoto, Sota Sato, Ko Yoneda e Masayuki Koikawa. "Crystal Structures, Magnetic Properties, and Redox Behaviors of Carboxylato-Bridged Mn(II) Complexes with Ditopic Ligands Featuring N3-Coordination Sites". Chemistry 6, n. 4 (27 luglio 2024): 601–17. http://dx.doi.org/10.3390/chemistry6040036.

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Carboxylato-bridged dinuclear and tetranuclear Mn(II) complexes 1–3 with ditopic ligands featuring two N3-terminal coordination sites connected by hexyl (tphn), octyl (tpon), and p-xylyl (tpxn) linkers have been synthesized and characterized through X-ray single-crystal structure analyses, infrared spectroscopy, and elemental analyses. Complex 1 is a μ-fluorido-bis-μ-acetato dinuclear Mn(II) complex where the ligand tphn coordinates to both terminal sides of a dinuclear Mn unit. In contrast, complexes 2 and 3 are tetranuclear Mn(II) complexes with a macrocyclic structure, in which two dinuclear Mn units are linked by ligands tpon or tpxn. The redox behaviors of 1 and 2 were elucidated by cyclic voltammetry, revealing two metal-centered redox processes corresponding to Mn2(II,II)/Mn2(II,III) and Mn2(II,III)/Mn2(III,III).

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Prananto, Yuniar P., David R. Turner, Jinzhen Lu e Stuart R. Batten. "Solvent-Induced Structural Changes in Complexes of 1,2-Bis(3-(3-pyridyl)pyrazolyl)ethane". Australian Journal of Chemistry 62, n. 2 (2009): 108. http://dx.doi.org/10.1071/ch08483.

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A series of complexes have been obtained using the flexible ditopic ligand 1,2-bis(3-(3-pyridyl)pyrazolyl)ethane (LEt) with M(SCN)2 (M = Co, Fe) and ZnCl2. The ligand is observed to exist in a variety of conformations with rotations around the ethane spacer and around the pyridyl/pyrazole bond. The bridging length of the ligand (i.e., distance between pyridyl nitrogen atoms) varies by 3.5 Å depending on its geometry. Three different cobalt(ii) complexes of the general form [Co(LEt)2(SCN)2]·Solv (where Solv is a variable number/type of non-coordinated solvent) have been structurally characterized and form a series of solvent dependant supramolecular isomers. When Solv = 2MeCN a (4,4)-sheet is formed (1), however, when Solv = H2O an alternate ‘collapsed’ (4,4)-sheet is observed (2). Changing the solvent to two molecules of N,N-dimethylformamide (DMF) leads to a radical change in structure with a one-dimensional (1D) polymer formed (3) that contains two bridging ligands between adjacent metal atoms (i.e., maintaining the same metal/ligand ratio as in the (4,4)-sheet structures). A monomeric thiocyanate complex [Fe(LEt)2(SCN)2(H2O)2] (4) is reported in which the bispyridyl ligands are terminal and partake in an extended hydrogen-bonded network. A 1D polymer [Zn(LEt)Cl2] (5) is also presented. The structures of the metal complexes are contrasted with that of the free ligand.

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40

Kopchuk, Dmitry S., Dmitry E. Pavlyuk, Igor S. Kovalev, Grigory V. Zyryanov, Vladimir L. Rusinov e Oleg N. Chupakhin. "Synthesis of a new DTTA- and 5-phenyl-2,2′-bipyridine-based ditopic ligand and its Eu3+ complex". Canadian Journal of Chemistry 94, n. 7 (luglio 2016): 599–603. http://dx.doi.org/10.1139/cjc-2015-0576.

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A new ditopic ligand based on diethylenetriamine-N,N,N″,N″-tetraacetate (DTTA) and 5-phenyl-2,2′-bipyridine has been synthesized. The improved method for the synthesis of DTTA tert-butyl ester has been developed. The water-soluble Eu3+*DTTA complex of this ligand has been prepared, and its photophysical properties have been studied. Due to the presence of an extra chelating unit, 5-phenyl-2,2′-bipyridine, this Eu3+*DTTA complex demonstrated a strong fluorescence response to the Zn2+ cation (fluorescence enhancement) and the simultaneous fluorescent and phosphorescent response (fluorescence and phosphorescence quenching) to the Cu2+ or Ni2+ cations in aqueous solutions.

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41

Ajamaa, Fettah, Anne-Marie Albrecht-Gary, Juan Luis Delgado de la Cruz, Mourad Elhabiri, Jean-François Nierengarten, Nathalie Solladié, Ali Trabolsi e Maxence Urbani. "A macrocyclic supramolecular complex obtained from a fullerene ligand bearing two pyridine substituents and a bis-Zn(II)-porphyrin receptor". Journal of Porphyrins and Phthalocyanines 10, n. 12 (dicembre 2006): 1337–45. http://dx.doi.org/10.1142/s1088424606000715.

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A fullerene derivative bearing two pyridine subunits has been designed to allow assembly with a bis- Zn (II)-phorphyrin receptor with two equivalent Zn binding sites separated by about 20 Å. Owing to the complementarity between the bis- Zn (II)-porphyrin receptor and a fullerene ligand bearing two pyridine substituents, the substrate can be clicked on the ditopic receptor, thus leading to a stable non-covalent macrocyclic 1:1 complex.

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42

Costero, Ana M., Pablo Gaviña, Gemma M. Rodríguez-Muñiz e Salvador Gil. "Relationship between ligand conformations and complexation properties in ditopic biphenyl thioureas". Tetrahedron 63, n. 33 (agosto 2007): 7899–905. http://dx.doi.org/10.1016/j.tet.2007.05.082.

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43

Drew, Michael G. B., Debbie McDowell e Jane Nelson. "A new ditopic polyaza macrobicyclic ligand: X-ray crystallographic structure determination". Polyhedron 7, n. 21 (gennaio 1988): 2229–32. http://dx.doi.org/10.1016/s0277-5387(00)81811-2.

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44

Chebanenko, E. A., I. I. Seifullina e E. E. Martsinko. "MIXED-LIGAND HETEROMETALLIC COMPLEXES OF Ge(IV)-M2+ (Mn, Fe, Co, Ni, Zn) WITH 1,3-DIAMINO-2-HYDROXYPROPANE N,N,N',N'-TETRAACETIC ACID". Odesa National University Herald. Chemistry 26, n. 3(79) (24 novembre 2021): 37–44. http://dx.doi.org/10.18524/2304-0947.2021.3(79).240751.

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There have been developed a novel synthetic method that allowed to obtain raw of mixed-ligand heterometallic binuclear complexes of Ge(IV)-M2+ (Mn, Fe, Co, Ni, Zn) with 1,3-diamino‑2-hydroxypropane N, N, N’, N’-tetraacetic acid (H5hpdta). Compounds have been characterized by the set of methods: elemental analysis, thermogravimetry, IR‑spectroscopy, spectrum of diffuse reflection, magnetic suspensibility. According to the elemental analysis, the molar ratio Ge: M: H5hpdta: bipy= 1:1:1:1 in the obtained compounds 1‑5 corresponds to the formula [(H2O)(OH)Ge(m-hpdta)M(bipy)]·nН2О (M=Mn n=3 (1), Fe n=2 (2), Co n=4 (3), Ni n=4 (4), Zn n=3 (5). Complexes have yellow (1), red (2), orange (3), violet (4) and pink (5) colors and are stable on air. Compounds 1‑5 exist in the form of crystal hydrates, that contain certain amount of water molecules, that are eliminated into the gas phase while heating in the wide range of temperatures (t=80‑250 °C), which is accompanied with the low-temperature endothermic effect. This indicates the presence of a system of stable hydrogen bonds in their crystal structure. Analysis of the IR‑spectra 1‑5 revealed that form and coordination of ligands is similar. Deprotonation of all carboxylic groups in the ligands (H5hpdta) and their bonding to germanium and d-metal is confirmed with the absence in the IR‑spectra 1‑5 absorption bands characteristic for the free СООН H5hpdta (1716 сm‑1) and nas(СОО-) і ns(СОО-) bands. Disappearance of the ν(С-OН)-1210 сm‑1 and appearance of the ν(С-O)alk., νas(Ge-O-M), νs(Ge-O- M) absorption band indicates that OH‑group of H5hpdta is deprotonated and performs bridging function. 2,2`-bipyridine bidentatly coordinates to the d-metal, binds to the O, N‑atoms of hpdta5- ligand and reaches coordination number 6. The last ligand plays the bringing role between Ge-dmetal, shows itself as ditopic, octadentate in total. According to the magnetic moments of 3, 4 and their diffuse reflection spectra, polyhedrons of Co (II), Ni (II) are octahedrons, which are realized due to the bidentate coordination of bipyridine and four bonds with nitrogen and oxygen of hpdta5-. Structure of heterometallic binuclear complexes 1‑5 is similar. Ligand hpdta5- shows itself as octadentate ditopic, all carboxylate groups monodentatly coordinate to metals, oxygen atom of the deprotonated OH‑group performs the bridging function.

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45

Tăbăcaru, Aurel, Claudio Pettinari, Mariana Bușilă e Rodica Mihaela Dinică. "New Antibacterial Silver(I) Coordination Polymers Based on a Flexible Ditopic Pyrazolyl-Type Ligand". Polymers 11, n. 10 (15 ottobre 2019): 1686. http://dx.doi.org/10.3390/polym11101686.

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In the last two decades, a tremendous amount of attention has been directed towards the design of antibacterial silver(I)-based materials, including coordination polymers (CPs) built up with a great variety of oxygen and nitrogen-containing ligands. Herein, a family of six new silver(I)-based CPs, having the general stoechiometric formula [Ag(H2DMPMB)(X)] (X = NO3, 1; CF3CO2, 2; CF3SO3, 3; BF4, 4; ClO4, 5; and PF6, 6) and incorporating the flexible ditopic pyrazolyl-type ligand 4,4′-bis((3,5-dimethyl-1H-pyrazol-4-yl)methyl)biphenyl (H2DMPMB), has been prepared by the chemical precipitation method involving the reaction of silver(I) salts with H2DMPMB in the 1:1 molar ratio, in alcohols, or acetonitrile at room temperature for two-hours. The new silver(I)-based polymeric materials were characterized by means of Fourier transform infrared spectroscopy (FTIR), elemental analysis (EA), and thermogravimetric analysis (TGA), allowing for the proposition that their structures comprise one-dimensional chains, with the silver(I) ions mostly assuming a T-shapped stereochemistry completed by the exo-bidentate ligands and counter-anions. The obtained silver(I) CPs showed a remarkable light insensitivity and stability in the air, are insoluble in water and in most common organic solvents, and possess appreciable thermal stabilities spanning the range 250–350 °C. The antibacterial activity of the obtained silver(I) CPs was tested against the Gram-negative bacteria Escherichia coli (E. coli) and Gram-positive bacteria Staphylococcus aureus (S. aureus) using the Tetrazolium/Formazan test (TTC), by measuring the bacterial viability at different time intervals. The complete reduction of both bacterial strains occurred after 24 h of exposure to all silver(I) CPs, the bacterial viability values for S. aureus reaching 8% for compounds 3, 5, and 6 after only two-hours.

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46

Truong, Khai-Nghi, Carina Merkens e Ulli Englert. "3-(Pyridin-4-yl)acetylacetone: a donor ligand towards mercury(II) halides and a versatile linker for complex materials". Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 73, n. 5 (29 settembre 2017): 981–91. http://dx.doi.org/10.1107/s2052520617011118.

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The ditopic organic molecule 3-(pyridin-4-yl)acetylacetone (HacacPy) acts as a pyridine-type ligand towards HgX2(X= Cl, Br, I). The nature of the anion and the ligand-to-cation ratio dominate the outcome of the reaction. Two different coordination compounds form with HgCl2, namely a ligand-rich mononuclear complex, HgCl2(HacacPy)2, and a ligand-deficient one-dimensional chain polymer, [Hg(μ-Cl)2(HacacPy)]1∞, with five-coordinated HgIIcations. Two compounds are also observed for HgBr2, a molecular complex isomorphous to the chloride derivative and a chain polymer with the composition [Hg(μ-Br)Br(HacacPy)]1∞, in which the cations are four-coordinated. The ligand-rich mononuclear and ligand-deficient polymeric chloride and bromide complexes may be interconvertedviathermal degradation and mechanochemical synthesis. In contrast to the chloride and bromide compounds, the reaction product with HgI2does not depend on the ligand-to-cation ratio but corresponds to [Hg(μ-I)I(HacacPy)]1∞, isomorphous to the bromide derivative. TheN-coordinated HacacPy complexes could not be deprotonated and further crosslinked with a second cation. Synthesis of mixed-metal products could be achieved, however, by deprotonation of the acetylacetone moiety in HacacPy and formation of tris-chelated Fe(acacPy)3and Al(acacPy)3complexes in the first step. These mononuclear building blocks act as bridging poly(pyridine) ligands towards HgIIhalides and form two structure types. The first represents a one-dimensional ladder, with the tris(ligand) complexes acting as triconnected nodes and the HgIIhalides acting as linkers. In the alternative unprecedented product, both the tris(ligand) complexes and the [HgX2(μ-X)HgX] groups act as equivalent triconnected nodes. They form a uninodal two-dimensional coordination network with vertex symbol 4.82andfestopology.

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47

Krenske, Elizabeth, e Lawrence R. Gahan. "Synthesis, Characterization and Complexation Studies of a Cage Ligand Bearing a Tris(bipyridyl)iron(II) Capping Group". Australian Journal of Chemistry 55, n. 12 (2002): 761. http://dx.doi.org/10.1071/ch02144.

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Reaction between 5-(4-amino-2-thiabutyl)-5-methyl-3,7-dithianonane-1,9-diamine (N3S3) and 5-methyl-2,2-bipyridine-5-carbaldehyde and subsequent reduction of the resulting imine with sodium borohydride results in a potentially ditopic ligand (L). Treatment of L with one equivalent of an iron(II) salt led to the monoprotonated complex [Fe(HL)]3+, isolated as the hexafluorophosphate salt. The presence of characteristic bands for the tris(bipyridyl)iron(II) chromophore in the UV/vis spectrum indicated that the iron(II) atom is coordinated octahedrally by the three bipyridyl (bipy) groups. The [Fe(bipy)3] moiety encloses a cavity composed of the N3S3 portion of the ditopic ligand. The mononuclear and monomeric nature of the complex [Fe(HL)]3+ has been established also by accurate mass analysis. [Fe(HL)]3+ displays reduced stability to base compared with the complex [Fe(bipy)3]2+. In aqueous solution [Fe(HL)]3+ exhibits irreversible electrochemical behaviour with an oxidation wave ca. 60 mV to more positive potential than [Fe(bipy)3]2+. Investigations of the interaction of [Fe(L)]2+ with copper(II), iron(II), and mercury(II) using mass spectroscopic and potentiometric methods suggested that where complexation occurred, fewer than six of the N3S3 cavity donors were involved. The high affinity of the complex [Fe(L)]2+ for protons is one reason suggested to contribute to the reluctance to coordinate a second metal ion.

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Rogozhin, A. F., V. A. Il´ichev, L. I. Silant´eva, T. A. Kovylina, E. A. Kozlova, G. K. Fukin e M. N. Bochkareva. "Coordination Compounds of Alkali and Rare Earth Metals Based on Centrosymmetric Chlorine-Substituted Bis-Mercaptooxazole. Synthesis, Structure, and Luminescence". Koordinacionnaâ himiâ 50, n. 7 (5 novembre 2024): 447–59. http://dx.doi.org/10.31857/s0132344x24070048.

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New coordination polymers were synthesized. A ditopic centrosymmetric organic ligand containing oxazole heterocycles, 4,8-dichlorobenzo[1,2d:4,5d´]bis(oxazole)-2,6(3H,7H)-dithione (H2L), was prepared and structurally characterized. It was shown that deprotonated H2L forms non-luminescent binuclear molecular complexes Li2L(THF)6 (I) and Na2L(DME)4 (II) with alkali metals, while complexes of H2L with lanthanides are ionic compounds [Ln(DMSO)8][L]1.5 (Ln = Nd (III), Yb (IV)) exhibiting moderate metalcentered emission in the near-infrared (IR) range, despite the absence of coordination of the ligand L to lanthanide ions. The molecular structures of H2L·2DMSO and I–III were established by X-ray diffraction (CCDC no. 2320461 (H2L·2DMSO), 2320462 (I), 2320463 (II), 2320464 (III)).

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Rodríguez-Hermida, S., A. B. Lago e R. Carballo. "Di- and tetranuclear zinc(II) complexes of a new ditopic-hydrazone ligand". Acta Crystallographica Section A Foundations of Crystallography 67, a1 (22 agosto 2011): C620. http://dx.doi.org/10.1107/s0108767311084327.

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50

Prokhorov, Anton, Hélène Bernard, Nathalie Le Bris, Nicolas Marquet e Henri Handel. "Synthesis of a New Ditopic Ligand Possessing Linear and Cyclic Tetraaza Subunits". Synthetic Communications 38, n. 10 (1 aprile 2008): 1589–600. http://dx.doi.org/10.1080/00397910801929481.

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