Influence of pseudohalide ligands on the structural versatility and properties of novel ternary metal complexes with 1,2,4-triazolo[1,5-a]pyrimidine

Abstract

Eight new multidimensional metal(II) complexes [Zn(tp)2(NCS)2] (1), [Ni(tp)2(H2O)2(µ-tp)2Ni(NCS)4]n (2), [Co(tp)2(H2O)2(µ-tp)2Co(NCS)4]n (3), [Cd(tp)2(NCS)2]n (4), [Mn(tp)2(NCS)2(H2O)2] (5), [Zn(tp)2(NCO)2] (6), [Cd(tp)(NCO)2]n (7) and [Cd(tp)(N3)2]n (8) have been synthesized by conventional reactions of the 1,2,4-triazolo[1,5-a]pyrimidine with metallic(II) salts in the presence of thiocyanate, cyanate and azide as auxiliary ligands. X-Ray diffraction studies on these compounds show that species 1, 5 and 6 are mononuclear units in which zinc and manganese have tetrahedral and octahedral coordination geometry, respectively. Complexes 2 and 3 are isostructural and consist of neutral chains with triazolopyrimidine bridging ligands through N1, N3 nitrogen atoms. Compound 4 exhibits a 2D rectangular-grid-like structure and complexes 7 and 8 are cyanate-bridged chains formed by defective cubanes. Magnetic and luminescent properties of these materials have also been studied.