Structural characterisation of mononuclear zinc(ii) complexes of 4-methyl-3,5-di(2-pyridyl)-4H-1,2,4-triazole with three-atom co-ligands: [ZnII(medpt)2X]ClO4 (X = NCS−, N3 −, NO2 −)

Autor: Marco H. Klingele, Julia Klingele, Gunther Steinfeld
Rok vydání: 2009
Předmět:
Zdroj: Transition Metal Chemistry. 35:65-71
ISSN: 1572-901X
0340-4285
DOI: 10.1007/s11243-009-9296-7
Popis: The reaction of 4-methyl-3,5-di(2-pyridyl)-4H-1,2,4-triazole (medpt) with Zn(ClO4)2·6H2O and NaSCN, NaN3 or NaNO2 in a 2:1:1 molar ratio in MeOH/H2O (9:1) affords the mononuclear complexes [ZnII(medpt)2(NCS)]ClO4, [ZnII(medpt)2(N3)]ClO4 and [ZnII(medpt)2(NO2)]ClO4, respectively. All three complexes have been structurally characterised and found to feature unusual coordination polyhedra for 3,5-di(2-pyridyl)-4H-1,2,4-triazole complexes. In [ZnII(medpt)2(NCS)]ClO4 and [ZnII(medpt)2(N3)]ClO4, the zinc atom resides within a distorted square-pyramidal N5 coordination sphere [τ = 0.22 and 0.04, respectively] with two bidentate medpt ligands bound equatorially and the pseudohalide ion coordinating as a unidentate co-ligand in the apical position. In contrast, the NO2 − ion in [ZnII(medpt)2(NO2)]ClO4 acts as a bidentate ligand, which leads to a strongly distorted N4O2 coordination environment about the metal centre.
Databáze: OpenAIRE
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