Synthesis, Structure and Luminescent Property of a Zinc(Ⅱ) Coordination Polymer Incorporating Flexible Cyclohexane-1,2,3,4,5,6-hexacarboxylate Ligand

The hydrothermal reaction of Zn(NO3)2·4H2O, cyclohexane-1,2,3,4,5,6-hexacarboxylic acid hydrate (H6LI·H2O, cis-conformation LI: a,e,a,e,a,e) and 2,2’-bpy yielded a new coordination polymer [Zn2(H2LII)(2,2’-bpy)]·2H2O(trans-conformation LII: e,e,e,e,e,e), which was characterized by single-crystal X-ray diffraction, elemental analysis, IR and XRPD(X-ray powder diffraction). This complex crystallized in the triclinic system, with P1 space group and parameters a=0.66922(5) nm, b=0.97291(8) nm, c=1.22184(9) nm, α=99.0020(10)°, β=99.1300(10)°, γ=99.1910(10)°, V= 0.76176(10) nm3 and Z=2. The structure is a three-dimensional supramolecular network based on linear coordination chains through π-π stacking and hydrogen bonding interactions. The confromation of the starting ligand H6LI transfromed to the H2LII. The complex emits strong luminescence at room temperature.