Single and double chain Zn(II) coordination polymers based on isomeric bidentate SCHIFF base ligands
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LOZOVAN, Vasile, KRAVTSOV, Victor, KOROPCHANU, E., FONARI, Marina. Single and double chain Zn(II) coordination polymers based on isomeric bidentate SCHIFF base ligands. In: Achievements and perspectives of modern chemistry, 9-11 octombrie 2019, Chişinău. Chisinau, Republic of Moldova: Tipografia Academiei de Ştiinţe a Moldovei, 2019, p. 124. ISBN 978-9975-62-428-2.
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Achievements and perspectives of modern chemistry 2019
Conferința "International Conference "Achievements and perspectives of modern chemistry""
Chişinău, Moldova, 9-11 octombrie 2019

Single and double chain Zn(II) coordination polymers based on isomeric bidentate SCHIFF base ligands


Pag. 124-124

Lozovan Vasile12, Kravtsov Victor3, Koropchanu E.12, Fonari Marina3
 
1 Institute of Chemistry,
2 Tiraspol State University,
3 Institute of Applied Physics
 
Disponibil în IBN: 7 noiembrie 2019


Rezumat

The study of inorganic-organic hybrid polymer materials has attracted considerable interest not only for their great potential applications but also for their versatile structures topologies [1]. A large number of coordination polymers have been already generated with 4,4'-bipyridyl bridging ligand [2]. Herein we report two 1D Zn(II) coordination polymers, [Zn(NO3)2(H2O)2(4bpmhz)]n*0.5n(EtOH) (1) and [Zn(NO3)2(3-bpmhz)2]n (2) derived from the semi-rigid Schiff-base N,N'-type ligands, 1,2-bis(pyridin-4-ylethylidene)hydrazine (4-bpmhz) and 1,2-bis(pyridin-3ylethylidene)hydrazine(3-bpmhz) whose crystal structures were confirmed by single-crystal X-ray diffraction analysis.Figure. The fragments of coordination chains in 1 and 2 Compound 1 crystallizes in the monoclinic I2/c space group: a=7.4726(2), b=11.5998(3), c=28.1718(9) Å, b=94.630(3)°, V=2433.98Å3. Each Zn(II) ions adopts N2O4 octahedral coordination geometry with two nitrogen donors from two symmetry related 4-bpmhzligands, and four oxygen donors from two nitrate anions, and two water molecules, respectively. The traces of ethanol solvent werefound in the crystal lattice. The relatively simple linear chain is formed due to the bidentate bridging 4-bpmhz ligands, while terminal nitrate anions and water molecules prevent the further structure extension. The replacement of 4-bpmhz ligand with its positional isomer, 3-bpmhz containing the N,N'-donor atoms in the 3,3’-positions, resultsin 1D coordination polymer with the linear double-chain structure. Compound crystallizes in the monoclinic P21/n space group: a=8.5712(3), b=17.3275(6), c=10.1744(4) Å, b=97.142(3)°, V=1499.34 Å3. The Zn(II) N4O2 octahedral coordination core is composed from four 3-bpmhz ligands being in significantly distorted twisted conformation, and two monodentate nitrate anions.