Syntheses, Crystal Structures, and Photoluminescence of Zinc(II) and Cobalt(II) Coordination Polymers Based on Semiflexible 1,4-Bis(4-phenoxy)benzenedicarboxylate

Hydrothermal reactions of Co(NO3)(2)6H(2)O and Zn(NO3)(2)6H(2)O with 1,4-bis(4-phenoxy)benzenedicarboxylic acid (H(2)bcpb) resulted in the formation of the coordination polymers [Zn(bcpb)(Py)](n) (1), and [Co(bcpb)(Py)(2)](n) (2), respectively. Their structures were studied by single-crystal and powder X-ray diffraction methods and further characterized by IR spectroscopy, elemental analyses, and thermogravimetric analyses (TGA). Single X-ray diffraction analyses revealed that complex 1 has a 1D loop chain. Each repeated unit contains two carboxylate ligands and two SBUs (secondary building units), whereas complex 2 has a 2D 4-connected sql sheet with point symbol (4(4).6(2)). The complexes are further expanded to 3D supramolecular structures through non-covalent bonding interactions. Besides, photoluminescent property of complex 1 was also investigated in the solid state at room temperature.