Zinc coordination polymers with rigid dicarboxylates and semirigid 3,5-bis(imidazole-1-yl) pyridine: syntheses, structural topologies, and luminescent properties

Abstract

Two metal coordination polymers, {[Zn(bpdc)(bip)]·2H₂O}_n (1) and [Zn(tdc)(bip)] (2) [H₂bpdc = biphenyl-4,4’-dicarboxylate, H₂tdc = thiophene-2,5-dicarboxylate, bip = 3,5-bis(imidazole-1-yl)pyridine], have been synthesized and characterized by IR, elemental analysis, XRD, and X-ray single-crystal diffraction. In 1, bpdc and bip link Zn(II) ions into a corrugated 2D layer. The corrugated 2D layers polycatenate each other, yielding a 2D→3D polycatenation net. In 2, dinuclear Zn(II) units are formed by bip and further connected by tdc to construct a 2D 3-connected framework. The luminescent properties of 1 and 2 are investigated in the solid state at room temperature.

Keywords:

• Zinc(II) coordination polymers
• Crystal structure
• Luminescence

Acknowledgment

We thank the support of this work by NSFC (No. 31200642 and 41106146), Special Funds for the Basic R&D Program in the Central Non-profit Research Institutes (No. 20603022012018) and Special Scientific Research Funds for Central Non-profit Institutes, Chinese Academy of Fishery Sciences (No. 2013A1002).