PSEUDOTETRAHEDRAL COBALT(II)-COMPLEXES OF 2,5-DIMETHYL-1,3,4-THIADIAZOLE

The cobalt(II) complexes of 2,5-dimethyl-l, 3,4-thiadiazole (DTZ) Co(DTZ)2X2(X = Cl, Br, I, N03) have been prepared and investigated. Their observed magnetic moments lie in the range 4.4-4.6 B.M. The complexes have a pseudo-tetrahedral coordination; a threefold splitting of the electronic v2and v3 bands of the halide complexes indicate aC2Vsymmetry. In the nitrate complex the anion is coordinated as monodentate ligand as shown by its infrared bands; however a weak interaction of a second oxygen atom, with a consequent distortion of the pseudo-tetrahedral coordination toward a six-coordination, cannot be excluded. In all these complexes the ligand DTZ is coordinated to the metal ion through one of the two nitrogen atoms. The far i.r. v(CoN) and v(CoX) (X = Cl, Br, I, O) bands were identified. © 1979, Taylor & Francis Group, LLC. All rights reserved.