Two novel coordination polymers with Zn(II): Synthesis, structural characterization, thermal analysis and fluorescent properties

Under similar hydrothermal synthetic conditions used, a novel flexible ligand 2-(3-(pyridin-2-yl)-1H-pyrazol-1-yl)acetonitrile (PPAN), benzenedicarboxylate isomers (H(2)ip = isophthalate, H(2)tp = terephthalate) and Zinc(II) acetate, two novel mixed-ligand Zn(II) coordination polymers {Zn-3(PPAA)(2)(mu(4)-ip)(2)}(n) (1) and {Zn-2(PPAA)(2)(mu-tp)}(n) (2) (PPAA(-) = 2-(3-(pyridin-2-yl)-1H-pyrazol-1-yl)acetate) have been isolated, in 1-2 PPAN ligand is also hydrolyzed into a novel PPAA(-) ligand. Complex 1 contains 1D double chains of {[Zn(PPAA)](+)}(n) cation structural units, which are further extended by these ten-a-dentate mu(4)-ip(2-) ligands forming a novel 2D three-layered framework with (4.8(2))(2)(4(3).6(2).8)(2)(4(3).8(3))(2)(4(8).6(6).8) topology. While complex 2 contains bi-nuclear [Zn-2(PPAA)(2)](2+) structural units, which are extended by four ten-a-dentate mu-tp(2-) ligands to link eight neighboring di-nuclear [Zn-2(PPAA)(2)](2+) units ultimately forming a 3D framework with a lim symbol of (4.10(2))(2)(4(2).10(4)) topology. The flexible coordination modes of PPAA(-) and benzenedicarboxylate isomers also reveal a great potential in the construction of these novel mixed-ligand luminescent frameworks with diverse structural motifs and unique functional properties. (C) 2013 Elsevier B.V. All rights reserved.