SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF THE MIXED TER- AND BIDENTATE SCHIFF BASE TECHNETIUM(V) COMPLEX TcO{(o[sbnd]O[sbnd]C6H4) (CH3) C[dbnd]NN[dbnd]C(S) (SCH3)} {(CH3)2C[dbnd]NN[dbnd]C(S) (SCH3)}

The complex TcO{(o[sbnd]O[sbnd]C6H4)(CH3) C[dbnd]NN[dbnd]C(S)(SCH3)}{(CH3)2C[dbnd]NN[dbnd]C(S) (SCH3)} was prepared by the reaction of (n-Bu4N) [TcOCl4] in methanol with the Schiff base S-methyl-β-N-(2-hydroxyphenylethylidene)dithiocarbazate in acetone. The compound was characterized by elemental analysis, vibrational and optical spectroscopy, and X-ray crystallography. Crystal data: C15H19N4O2S4Tc, monoclinic, space group P21/c, a = 14.799(5), b = 7.470(2), c = 19.272(5)A, U = 2064.4(1.8)A3, Z = 4, D calc = 1.65 g cm−3. The structure was refined by least-squares methods to R = 0.102. The complex has a Tc=O bond distance of 1.633(8)A, and the deprotonated phenolic oxygen of the terdentate ONS-donor ligand is coordinated trans to the oxo oxygen.