Schiff base chemistry of the rhenium(V)-oxo core with '3+2' ligand donor sets.

Overview

Reactions of [ReOCl(3)(PPh(3))(2)] with the bidentate ligands 2-(2-hydroxyphenyl) benzoxazole and (2'-hydroxyphenyl)-2-thiazoline resulted in the isolation of the complexes [ReOCl(2)(OC(6)H(4)-2-C=NC(6)H(4)-2-O)(PPh(3))] (1) and [ReOCl(2)(OC(6)H(4)-2-C=NCH(2)CH(2)S)(PPh(3))] (2). Reactions of 1 with the tridentate Schiff base ligands salicylaldehyde 2-hydroxyanil (H(2)L(1b)), salicylaldehyde 2-mercaptoanil (H(2)L(2b)) afnd S-benzyl-2-[(2-hydroxyphenyl)methylene] dithiocarbazate (H(2)L(3b)) yielded the '3+2' rhenium(V) oxo species [ReO(OC(6)H(4)-2-C=NC(6)H(4)O) (OC(6)H(4)CH=NC(6)H(4)O)] (3), [ReO(OC(6)H(4)-2-C=NC(6)H(4)O)-(OC(6)H(4)CH=NC(6)H(4)S)] (4) and [ReO(OC(6)H(4)-2-C=NC(6)H(4)O){OC(6)H(4)CH=N-N=C(SCH(2)C(6)H(5))S}] (5). Similarly, the reactions of [ReOCl(2)(OC(6)H(4)-2-C=NC(6)H(4)S)(PPh(3))] (2) with H(2)L(2b), H(2)L(3b) and 2-[(2-hydroxyphenyl) methylene]-N-phenyl-hydrazinecarbothioamide (H(2)L(4b)) were exploited to prepare [ReO(OC(6)H(4)-2-C=NC(6)H(4)S)(OC(6)H(4)CH=NC(6)H(4)O)] (6), [ReO(OC(6)H(4)C=NC(6)H(4)S){OC(6)H(4)CH=N-N=C (SCH(2)C(6)H(5))S}] (7) and [ReO(OC(6)H(4)-2-C=NC(6)H(4)S){OC(6)H(4)CH=N-N=C(NHC(6)H(5))}] (8), respectively.