Influence of the counter anion and steric hindrance of pyrazolyl and imidazolyl flexible ligands on the structure of zinc-based coordination polymers
Articolo
Data di Pubblicazione:
2014
Citazione:
Influence of the counter anion and steric hindrance of pyrazolyl and imidazolyl flexible ligands on the structure of zinc-based coordination polymers / V. Nobakht, A. Beheshti, D.M. Proserpio, L. Carlucci, C.T. Abrahams. - In: INORGANICA CHIMICA ACTA. - ISSN 0020-1693. - 414(2014), pp. 217-225. [10.1016/j.ica.2014.02.005]
Abstract:
Treatments of flexible 1,4-bis(3,5-dimethylpyrazolyl)butane (bbd), 1,4-bis(imidazolyl)butane (bib) and
1,4-bis(2-methylimidazolyl)butane (bmib) ligands with zinc salts at room temperature, resulted in the
formation of four novel metal–organic coordination architectures: [ZnI2(l-bbd)]n (1), [Zn(NCS)2(l-bbd)]n
(2), {[Zn(l-bib)2](ClO4)2 (Et2O)0.5 (H2O)0.25}n (3) and {[Zn(l-bmib)2](ClO4)2 (H2O)4}n (4). X-ray crystallographic
analyses show different 1D and 3D polymeric structures for compounds 1–4 due to the variation
of the counter anions, solvent, steric hindrance and position of donating atoms in the structure of flexible
ligands. In 1 and 2, one-dimensional (1D) zig-zag polymeric chains are formed via metal centers and
l-bbd ligands. Complex 3 shows a 3-fold interpenetrated 3D architecture with 10^3-ths network topology.
In contrast to 3, in the structure of 4 neighboring Zn(II) ions are interconnected by a double-bridging
l-bmib ligands to form an infinite 1D polymeric double chain. The conformations of the flexible ligands
were analyzed in detail.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Coordination polymer; Counter anion effect; Flexible ligand; Pyrazolyl and imidazolyl ligands; Zinc
Elenco autori:
V. Nobakht, A. Beheshti, D.M. Proserpio, L. Carlucci, C.T. Abrahams
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