Syntheses, Crystal Structures, Luminescent Properties and Electrochemical Synthesis of Group 12 Element Coordination Polymers with 4-substituted 1,2,4-triazole Ligands
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The self-assembly of Zn(II), Cd(II) or Hg(II) salts with long flexible 1,2,4-triazole based ligands resulted in coordination polymers and mononuclear complexes of diverse topology. Indeed, the 1D chain [ZnCl2(btpm)] (1)(P?1), the 2D square-grid [Zn(btpm)2(H2O)](BF4)2·2(btpm)·8H2O (2)(P21212),and the 1D chain [Cd3Cl6(btpm)2]·8H2O (3)(P?1), with btpm = bis(4-(1,2,4-triazol-4-yl)phenyl)methane were crystallized. In addition, the mononuclear complexes [ZnCl2(ppt)2] (4) (I2) and [HgBr2(ppt)2] (5)(C2) were obtained along with the 1D polymer
[Cd2Cl2(ppt)4](CdCl4)·4DMF (6) (P?1), with ppt = (4-phenoxyphenyl)-1,2,4-triazole.
1D chains of formula [ZnCl2(tpca)] (7) (P21/c) and [HgBr2(tpca)] (8) (P21/c), along with the 2D net, [Cd(tpca)2(H2O)2]·2H2O (C2/c) (9) with tpca = N-(1,2,4-triazol-4-yl)pyridine-3-carboxamide. In addition, the X-ray structures of tpca and ppt are described. All compounds display solid-state blue luminescence which has been investigated in detail. Electrochemical synthesis of 2, which has been rarely applied for MOFs synthesis, revealed hollow particles.