The reaction of the new asymmetric 1,3,4-thiadiazole-based ligand 2-[(5-ethylthio-1,3,4-thiadiazol-2-yl)hydrazonomethyl]phenol (H 1 ETHP) with various third-row transition metal salts resulted in the formation of six new mononuclear complexes [Cr(ETHP) 2 ]ClO 4 (1), [Fe(ETHP) 2 ][FeCl 4 ] (2), [Co(ETHP)(ETHP -H )] (3), [Ni(ETHP)(H 1 ETHP)]Cl (4), [Ni(ETHP)(H 1 ETHP)](ClO 4 ) (5), [Ni(ETHP)(H 1 ETHP)]Br (6), and one tetranuclear complex [Cu 2 Cl 3 (ETHP)(H 1 ETHP)] 2 (7). H 1 ETHP and all complexes have been analyzed by single crystal X-ray diffraction. Structural analysis of 1-6 reveals complexes of the [ML 2 ] n+type (n = 0,1), in which the mono anionic ligand ETHP coordinates in a tridentate NNO fashion via its imine, thiadiazole and [a]
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