Iron(III) and cobalt(III) complexes of types [Fe(LEt) 2 ]ClO 4 ·3/2C 6 H 6 (1) and [Co(LEt) 2 ]ClO 4 ·2CH 2 Cl 2 (2) with a new pyrimidine-derived thiosemicarbazone ligand, 2-S-methyl-6-methyl-4-formylpyrimidine-N(4)-ethylthiosemicarbazone (HLEt), having N, N, S donor centers have been synthesized and characterized by X-ray crystallography. The structural study shows distorted octahedral geometry for both 1 and 2 with MN 4 S 2 chromophores. The space group of 1 is C2/c (monoclinic) and that of 2 is P2 1 2 1 2 1 (orthorhombic). The electrochemical electron transfer study in MeCN solutions shows a one-electron reductive response presumably due to a metal(III)-metal(II) couple.
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