Two Tetranuclear Zinc(II) Coordination Polymers Based on 3,5-Bis(2-carboxylphenoxy)benzoic Acid with Highly Selective Sensing of Nitrobenzene

Two novel zinc(II) coordination polymers, [Zn-2(BCB)(CH3OH)(mu(3)-OH)](n) (1) and {[Zn-2(BCB)(mu(3)-OH)(H2O)(2)]center dot CH3OH}(n) (2), have been constructed from 3,5-bis(2-carboxylphenoxy)benzoic acid (H3BCB) and characterized by elemental analysis (EA), IR, powder X-ray diffraction (PXRD), and thermogravimetric (TG) analyses. Structural analysis reveals that complexes 1 and 2 are both 1D polymeric chains with unprecedented tetranuclear {Zn-4(COO)(4)(mu(3)-OH)(2)} clusters, which were further expanded into a 2D structure. Fluorescence measurements show that 1 and 2 have highly selective and sensitive detection of nitrobenzene.