scholarly journals Rational Design of Carborane-Based Cu2-paddle wheel Coordination Polymers for Increased Hydrolytic Stability

2022 ◽  
Author(s):  
Zhen Li ◽  
Duane Choquesillo-Lazarte ◽  
Julio Fraile ◽  
Clara Vinas ◽  
Francesc Teixidor ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Coordination Polymers ◽  
Rational Design ◽  
Hydrolytic Stability ◽  
Paddle Wheel

A new unsymmetric carborane based dicarboxylic linker provided a 1D Cu2-paddle wheel coordination polymer (2) with much higher hydrolytic stability than the corresponding 2D Cu2-paddle wheel polymer (1), obtained from...

scholarly journals From a Well-Defined Organozinc Precursor to Diverse Luminescent Coordination Polymers Based on Zn(II)-Quinolinate Building Units Interconnected by Mixed Ligand Systems

Molecules ◽  
2021 ◽  
Vol 26 (23) ◽  
pp. 7402
Author(s):  
Katarzyna Sołtys-Brzostek ◽  
Kamil Sokołowski ◽  
Iwona Justyniak ◽  
Michał K. Leszczyński ◽  
Natalia Olejnik-Fehér ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Coordination Polymers ◽  
Self Assembly ◽  
Rational Design ◽  
Building Blocks ◽  
Mixed Ligand ◽  
Direct Reaction ◽  
Synthetic Strategy ◽  
Secondary Building Units ◽  
Additional Base

Introduction of photoactive building blocks into mixed-ligand coordination polymers appears to be a promising way to produce new advanced luminescent materials. However, rational design and self-assembly of the multi-component supramolecular systems is challenging from both a conceptual and synthetic perspective. Here, we report exploratory studies that investigate the potential of [Zn(q)2]2[tBuZn(OH)]2 complex (q = deprotonated 8-hydroxyquinoline) as an organozinc precursor as well as a mixed-ligand synthetic strategy for the preparation of new luminescent coordination polymers (CPs). As a result we present three new 2D mixed-ligand Zn(II)-quinolinate coordination polymers which are based on various zinc quinolinate secondary building units interconnected by two different organic linker types, i.e., deprotonated 4,4′-oxybisbenzoic acid (H2obc) as a flexible dicarboxylate linker and/or selected bipyridines (bipy). Remarkably, using the title organozinc precursors in a combination with H2obc and 4,4′-bipyridine, a novel molecular zinc quinolinate building unit, [Zn4(q)6(bipy)2(obc)2], was obtained which self-assembled into a chain-type hydrogen-bonded network. The application of the organometallic precursor allowed for its direct reaction with the selected ligands at ambient temperature, avoiding the use of both solvothermal conditions and additional base reagents. In turn, the reaction involving Zn(NO3)2, as a classical inorganic precursor, in a combination with H2obc and bipy led to a novel 1D coordination polymer [Zn2(q)2(NO3)2(bipy)]. While the presence of H2obc was essential for the formation of this coordination polymer, this ditopic linker was not incorporated into the isolated product, which indicates its templating behavior. The reported compounds were characterized by single-crystal and powder X-ray diffraction, elemental analysis as well as UV-Vis and photoluminescence spectroscopy.

scholarly journals Pyrene Carboxylate Ligand Based Coordination Polymers for Microwave-Assisted Solvent-Free Cyanosilylation of Aldehydes

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 1101
Author(s):  
Anirban Karmakar ◽  
Anup Paul ◽  
Elia Pantanetti Sabatini ◽  
M. Fátima C. Guedes da Silva ◽  
Armando J. L. Pombeiro
Keyword(s):  
Coordination Polymer ◽  
Single Crystal ◽  
Coordination Polymers ◽  
Metal Ion ◽  
Solvent Free ◽  
Lewis Acidity ◽  
Carboxylate Ligand ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Assisted

The new coordination polymers (CPs) [Zn(μ-1κO1:1κO2-L)(H2O)2]n·n(H2O) (1) and [Cd(μ4-1κO1O2:2κN:3,4κO3-L)(H2O)]n·n(H2O) (2) are reported, being prepared by the solvothermal reactions of 5-{(pyren-4-ylmethyl)amino}isophthalic acid (H2L) with Zn(NO3)2.6H2O or Cd(NO3)2.4H2O, respectively. They were synthesized in a basic ethanolic medium or a DMF:H2O mixture, respectively. These compounds were characterized by single-crystal X-ray diffraction, FTIR spectroscopy, thermogravimetric and elemental analysis. The single-crystal X-ray diffraction analysis revealed that compound 1 is a one dimensional linear coordination polymer, whereas 2 presents a two dimensional network. In both compounds, the coordinating ligand (L2−) is twisted due to the rotation of the pyrene ring around the CH2-NH bond. In compound 1, the Zn(II) metal ion has a tetrahedral geometry, whereas, in 2, the dinuclear [Cd2(COO)2] moiety acts as a secondary building unit and the Cd(II) ion possesses a distorted octahedral geometry. Recently, several CPs have been explored for the cyanosilylation reaction under conventional conditions, but microwave-assisted cyanosilylation of aldehydes catalyzed by CPs has not yet been well studied. Thus, we have tested the solvent-free microwave-assisted cyanosilylation reactions of different aldehydes, with trimethylsilyl cyanide, using our synthesized compounds, which behave as highly active heterogeneous catalysts. The coordination polymer 1 is more effective than 2, conceivably due to the higher Lewis acidity of the Zn(II) than the Cd(II) center and to a higher accessibility of the metal centers in the former framework. We have also checked the heterogeneity and recyclability of these coordination polymers, showing that they remain active at least after four recyclings.

scholarly journals Rational Design of Copper(II)–Uracil Nanoprocessed Coordination Polymers to Improve Their Cytotoxic Activity in Biological Media

2021 ◽  
Author(s):  
Verónica G. Vegas ◽  
Ana Latorre ◽  
María Luisa Marcos ◽  
Carlos J. Gómez-García ◽  
Óscar Castillo ◽  
...  
Keyword(s):  
Cytotoxic Activity ◽  
Coordination Polymers ◽  
Rational Design ◽  
Biological Media

scholarly journals Crystal structure ofcatena-poly[hemi[1,3-bis(2,6-diisopropylphenyl)imidazolium] [[μ3-acetato-κ3O:O:O′-tri-μ2-acetato-κ6O:O′-dicopper(II)(Cu—Cu)]-μ-chlorido] dichloromethane sesquisolvate]

2015 ◽  
Vol 71 (8) ◽  
pp. m148-m149
Author(s):  
Mohammad Iqbal ◽  
James Raftery ◽  
Peter Quayle
Keyword(s):  
Coordination Polymer ◽  
Rotation Axis ◽  
Metal Organic Framework ◽  
Solvent Molecule ◽  
Central Metal ◽  
Imidazolium Cation ◽  
One Dimensional ◽  
Paddle Wheel ◽  
Internuclear Axis ◽  
Solvent Molecules

The title copper(II) complex, {(C27H37N2)[Cu4(CH3COO)8Cl]·3CH2Cl2}n, is a one-dimensional coordination polymer. The asymmetric unit is composed of a copper(II) tetraacetate paddle-wheel complex, a Cl−anion situated on a twofold rotation axis, half a 1,3-bis(2,6-diisopropylphenyl)imidazolium cation (the whole molecule being generated by twofold rotation symmetry) and one and a half of a dichloromethane solvent molecule (one being located about a twofold rotation axis). The central metal-organic framework comprises of a tetranuclear copper(II) acetate `paddle-wheel' complex which arises from the dimerization of the copper(II) tetraacetate core comprising of three μ2-bidentate acetate and one μ3-tridentate acetate ligands per binuclear paddle-wheel complex. Both CuIIatoms of the binuclear component adopt a distorted square-pyramidal coordination geometry (τ = 0.04), with a Cu...Cu separation of 2.6016 (2) Å. The apical coordination site of one CuIIatom is occupied by an O atom of a neighbouring acetate bridge [Cu—O = 2.200 (2) Å], while that of the second CuIIatom is occupied by a bridging chloride ligand [Cu...Cl = 2.4364 (4) Å]. The chloride bridge is slightly bent with respect to the Cu...Cu internuclear axis [Cu—Cl—Cu = 167.06 (6)°] and the tetranuclear units are located about a twofold rotation axis, forming the one-dimensional polymer that propagates along [101]. Charge neutrality is maintained by the inclusion of the 1,3-bis(2,6-diisopropylphenyl)imidazolium cation within the crystal lattice. In the crystal, the cation and dichloromethane solvent molecules are linked to the coordination polymer by various C—H...O and C—H...Cl hydrogen bonds. There are no other significant intermolecular interactions present.

Coordination-induced emission enhancement in copper(I) iodide coordination polymers supported by 2-(alkylsulfanyl)pyrimidines

2021 ◽  
Author(s):  
Katerina A. Vinogradova ◽  
Nikita Shekhovtsov ◽  
Alexey Sergeevich Berezin ◽  
Taisiya Sukhikh ◽  
Maxim I. Rogovoy ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Coordination Polymers ◽  
Molar Ratios ◽  
Emission Enhancement

First examples of copper(I) complexes with 2-(alkylsulfanyl)pyrimidine ligands have been synthesized. Reactions of copper(I) iodide with 2-(methylsulfanyl)pyrimidine (L1) in various metal-to-ligand molar ratios in MeCN afford a ladder-type coordination polymer...

Ferromagnetic ordering of –[Sm(iii)-radical]n– coordination polymers

2016 ◽  
Vol 52 (31) ◽  
pp. 5414-5417 ◽  
Author(s):  
Elisabeth M. Fatila ◽  
Adam C. Maahs ◽  
Michelle B. Mills ◽  
Mathieu Rouzières ◽  
Dmitriy V. Soldatov ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Coordination Polymers ◽  
Ferromagnetic Ordering

A structurally characterized lanthanide-radical coordination polymer exhibits ferromagnetic ordering. Superexchange and McConnel I mechanisms are implicated.

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