A series of neutral rhenium(V) oxo complexes was synthesized by the reaction of ReOBr4-with diamino-thiolthioether ligands of the type (RSC(CH~)~CH~NH(O-C&)NHCH~C(CH~)~SH. The complexes were characterized by IR, UVIvisible, and 'H and 13C NMR spectroscopy and by fast-atom-bombardment mass spectroscopy. The single-crystal X-ray structure determination on two of the complexes, where R = CH2CH-CH2 and CH2CH2-CH3, showed them to consist of a square pyramidal ReVON2S2 core. R~O[CH~=CHCHZSC(CH~)~CH~N(~-C6&)NCH2C(CH3)2S], C17HzsN20SzRe, crystallizes in the monoclinic space group P21h with a = 17.899(3) A, b = 13.910(1) A, c = 15.936(1) A, , ! ? = 104.70(1)", Z = 8, DCdc = 1.813 g ~m -~, andp(Cu Ka) = 139.8 cm-'. The propyl complex, C17H27N20S2Re, crystallizes in the monoclinic space group P211u with u = 18.076(1) A, b = 13.920(1) A, c = 15.994(1) A, , ! ? = 105.09(1)", Z = 8, Dcdc = 1.797 g ~m -~, and p(Cu Ka) = 138.0 cm-'.The combination of the steric and electronic effects of the aromatic ring fused to the backbone of the N-C-C-N ligand and the S-substitution result in deprotonation of both amine nitrogens and coplanarity of the base of the square pyramidal complex.
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