Exploring oxorhenium '3+1' mixed-ligand complexes carrying the S-benzyl-3-[(2-hydroxyphenyl)methylene]dithiocarbazate [ONS]/monothiol [S] donor set: synthesis and characterization.

The reaction of ReOCl(3)(PPh(3))(2) with the potentially tridentate ligand S-benzyl-3-[(2-hydroxyphenyl)methylene]dithiocarbazate ([ONS] donor set) and para-substituted benzenethiols [C(6)H(4)X-4-SH] (where X=H, F, Cl, Br and OCH(3)) in the presence of Et(3)N afforded a series of integrated '3+1' oxorhenium(V) complexes with general formula [ReO{eta(3)-OC(6)H(4)-2-CH=N-N=C(SCH(2)Ph)-S}(eta(1)-C(6)H(4)X-4-S)]. The molecular structure of [ReO{eta(3)-OC(6)H(4)-2-CH=N-N=C(SCH(2)Ph)-S}(eta(1)-C(6)H(4)F-4-S)] (4) was determined by single-crystal X-ray analysis. Complex 4 consists of a central oxorhenium(V) core with phenolic oxygen, azomethine nitrogen and thiol sulfur donor from the thiosemicarbazone Schiff base ligand and one sulfur donor from monothiol ligand completing a distorted square pyramidal environment. Crystal data for 4, C(21)H(16)FN(2)O(2)S(3)Re: orthorhombic, P2(1)2(1)2(1), a=5.6682(3), b=11.6600(6), c=31.697(2) A, V=2094.9(2) A(3), Z=4.