A Zinc（II） Coordination Polymer Possessing a Linear Trinuclear Building Block [Zn3（CO2）6N2]

A new coordination polymer [Zn3(bpda)3(bpy)]1(H2bpda=2,2’-biphenyldicar-boxylic acid, bpy=4,4’-bipyridien) has been hydrothermally synthesized and characterized by single-crystal X-ray diffraction analysis, elemental analysis, TG analysis and IR spectrum. 1 Crystallizes in cubic crystal system, space group Ia3, with a=20.9687(9), V=9219.7(3)3, Z=8, and R(I> 2σ(I))=0.0431. Complex 1 is a three-dimensional framework involving a new building block, linear trinuclear {Zn3(CO2)6N2} cluster. In the structure, each bpda coordinates to four zinc atoms via its two bridging bidentate carboxylate groups. To the best of our knowledge, 1 implies a new coordination mode of 2,2’-biphenyldicarboxylic acid. The solid state fluorescent spectra show a strong emission peak at 451 nm (λex=341 nm).