Synthesis, Crystal Structure and Photoluminescent Property of a New Zn(II) Complex Based on 3,4-Bis(2-pyridyl)-5-(4-pyridyl)-1,2,4-triazole

The coordination polymer [Zn-1.5(2,2',4 ''-tpt)(tpa)(2)](n) (2,2',4 ''-tpt = 3,4-bis(2-Pyridyl)-5-(4-pyridyl)-1,2,4-triazole, H(2)tpa = terephthalic acid) has been obtained by solution evaporation method and characterized by elemental analysis, IR, TG and single-crystal X-ray diffraction. The title compound crystallizes in the triclinic system, space group P (1) over bar, with a = 10.331(3), b = 10.596(1), c = 14.966(3) angstrom, beta = 99.029(0)degrees, V = 1448.86(6) angstrom(3), Z = 2, D-c = 1.668 g/cm(3), = 1.320 mm(-1), F(000) = 740, R = 0.0359 and wR = 0.0841 with I > 2 sigma(I)). In this polymer, the asymmetric unit contains two crystallographically independent Zn(II) ions in different coordination environments. Zn(1) ion is five-coordinated, forming a distorted tetragonal pyramidal geometry, while the Zn(2) ion is six-coordinated to get a distorted octahedral geometry. Each Zn(II) ion is linked by 2,2',4 ''-tpt and H(2)tpa ligands, forming an infinite 2D structure. The existence of O(8)-H(8)center dot center dot center dot O(2) hydrogen bonding interactions leads the 2D chains to generate a 3D structure. In addition, 1 shows strong photoluminescent emissions in the solid state at room temperature, so it can be used as potential optical materials.