Influence of the counter anion and steric hindrance of pyrazolyl and imidazolyl flexible ligands on the structure of zinc-based coordination polymers

摘要: 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 four novel metal–organic coordination architectures: [ZnI2(μ-bbd)]n (1), [Zn(NCS)2(μ-bbd)]n (2), {[Zn(μ-bib)2](ClO4)2·(Et2O)0.5·(H2O)0.25}n (3) {[Zn(μ-bmib)2](ClO4)2·(H2O)4}n (4). X-ray crystallographic analyses show different 1D 3D polymeric structures for compounds 1–4 due to variation counter anions, solvent, steric hindrance position donating atoms structure ligands. In 1 2, one-dimensional (1D) zig-zag chains are formed via metal centers μ-bbd Complex 3 shows a 3-fold interpenetrated architecture 103-ths network topology. contrast 3, 4 neighboring Zn(II) ions interconnected by double-bridging μ-bmib form an infinite double chain. The conformations were analyzed detail.