Abstract
The hydrothermal reactions of 5-bromoisophthalic acid (H 2BIPA) and metal salts in the presence of pyridine (py) result in three new coordination polymers, namely, M(BIPA)(py) 3 [M = Co(II) ( 1), Ni(II) ( 2)] and Zn(BIPA)(py) 2·H 2O ( 3), all of which have been characterized by single-crystal X-ray, elemental analysis, infrared spectroscopy, and thermogravimetric analysis. Compounds 1 and 2 are isostructural and contain 2 1 helical chains made up of metal ions and BIPA 2− ligand, the chains are further formed to the supramolecular structures by the π⋯π interactions between the adjacent parallel py rings. Compound 3 has a 1D chiral left-handed helical chain structure. It is notable that 3 is obtained by second order spontaneous resolution using achiral starting materials. Moreover, the solid-state CD spectrum of single crystals and powder samples of 3 is investigated. The nonlinear optical measurement shows that 3 displayed a second-harmonic-generation (SHG) response of 0.7 times that for urea.
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