Construction of Cd/Zn(II)-1,2,4-triazolate coordination complexes via changing substituents and anions

A series of zero- to three-dimensional Cd/Zn(II)-1,2,4-triazolate coordination complexes have been obtained by changing the anions and the substituents on the triazole ring. Cd-2(2-pytrz)(2)Cl-4 (1) and Cd-3(patrz)(4)Cl-6 (2) (2-pytrz = 3,5-di(pyrid-2-yl)-1,2,4-triazole and dpatrz) 3,5-di(n-propyl)-4-amino-1,2,4-triazole) have discrete binuclear and trinuclear structures, respectively. Cd-3(atrz)(4)Cl-6 (3) and Cd(atrz)(2)(SCN)(2) (4) (atrz = 4-amino-1,2,4-triazole) are polymeric 1D chains constructed from trinuclear cadmium units and mononuclear cores. Cd(datrz)I (5), Zn(dmtrz)Cl (6), and Cd-3(dmatrz)(4)(N-3)(6) (7) (datrz = 3,5-diamino-1,2,4-triazole, dmtrz) 3,5-dimethyl-1,2,4-triazole, and dmatrz = 3,5-dimethyl-4-amino-1,2,4-triazole) all show two-dimensional layer structures. Complexes 5 and 6 are 2D grids based on binuclear clusters and present (4.8(2))(metal)(4.8(2))(trz) topology. Complex 7 is of 2D (4,4) topology when trinuclear cadmium units are regarded as four-connected nodes. For complexes 1-7, weak hydrogen-bonding contacts link the discrete polynuclear clusters, 1D chains, or 2D layers to form three-dimensional supramolecular structures. Zn-2(trz)(3)Cl (8) (trz = 1,2,4-triazole) presents an interesting 3D network based on three nonequivalent nodes and has a (4(6)8(6)12(24))(8(6)12(54))(4(2)8(4)12(36))(3) topology. Complexes 1-8 all exhibit strong blue fluorescence emission bands in the solid state at ambient temperature.