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SM ISO690:2012 LOZOVAN, Vasile, KRAVTSOV, Victor, KOROPCHANU, E., FONARI, Marina. Two isomorphous 1D coordination polymers derived from Zn(II) and Cd(II) iodide and bridged N,N'-donor azomethine ligand. In: Achievements and perspectives of modern chemistry, 9-11 octombrie 2019, Chişinău. Chisinau, Republic of Moldova: Tipografia Academiei de Ştiinţe a Moldovei, 2019, p. 123. 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 | |||||
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Pag. 123-123 | |||||
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Along with the 3D coordination frameworks, the low-dimensional (1D and 2D) coordination polymers as objects of the study by materials science and crystal engineering [1, 2], some of them are exhibiting molecular ferromagnets, are synthetic conductors, non-linear optical materials, and segnetoelectrics, whose crystal structures and useful properties can be varied by fitting their components. We report two isomorphous 1D coordination polymers constructed from the Schiff-base N,N'-type ligand,1,2-bis(pyridin-4-ylethylidene)hydrazine)(4-bpmhz), namely [CdI2(4-bpmhz)]n(1) and [ZnI2(4-bpmhz)]n(2). The structures of compounds were determined using X-ray diffraction method (Figure).Figure. a) the fragment of polymer chain in 1; b) packing of the chains The isomorphous crystals of compounds 1 and 2 differ by the metal cation only. Compounds crystallize in the monoclinicP21/nsp. gr.: for 1a=7.35379(3), b=17.5832(6), c=14.6230(4) Å, b=102.270(3)°, V=1847.59 Å3; for 2a=6.9997(8), b=18.3085(12), c=14.3436(9)Å, b=101.921(9)°, V=1798.5(3) Å3. All components occupy general positions. The N2I2tetrahedral configuration of the metal atom is formed by two iodide anions and two 4-bpmhz ligands, Cd–I 2.6675(5) and 2.6911(5) Å, Cd–N 2.301(4) and 2.305(4) Å(Zn–I 2.528(17) and 2.550(19)Å, Zn–N 2.063(12) and 2.082(12) Å). The corresponding distances in 1 are insignificantly elongated because of the larger radius of the Cd atom compared to Zn. The zigzag coordination chains run along the crystallographic b axis in both crystals. |
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