SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF THE MIXED TERDENTATE ANDBIDENTATE SCHIFF-BASE TECHNETIUM(V) COMPLEX TCO((O-O-C6H4) (CH3) C=NN=C(S) (SCH3))((CH3)2C=NN=C(S) (SCH3))

The complex cO{(o-O-C6H4)(CH3)C=NN=C(S)(SCH3)}{(CH3)2C=NN=C(S) (SCH3)} was prepared by the reaction of (n-Bu4N) [TcOCl4] in methanol with th e Schiff base -beta-N-(2-hydroxyphenylethylidene)dithiocarbazate in ac etone. The compound was characterized by elemental analysis, vibration al and optical spectroscopy, and X-ray crystallography. Crystal data: C15H19N4O2S4Tc, monoclinic, space group P2(1)/c, a = 14.799(5), b = 7. 470(2), c = 19.272(5) angstrom, U = 2064.4(l.8) angstrom3, Z = 4, D(ca lc) = 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) angstr om, and the deprotonated phenolic oxygen of the terdentate ONS-donor l igand is coordinated trans to the oxo oxygen.