Dihalogenovanadium(IV) 5,7,12,14-tetramethyldibenzo[ b, i][1,4,7,11]Tetraazacyclodecinato complexes: Spectroscopic characterization and synthetic applications

Abstract

Products from the reaction of (C 22H 22N 4)V (C 22H 22N 4  deprotonated N 4 macrocyclic ligand 5,7,12,14-tetramethyldibenzo[ b, i][1,4,7,11]tetraazacyclodecine, H 2L) with halogenating agents depend on their nature. Stirring with two equivalents of oxalyl or thionyl dihalide (X, halide  Cl, Br) afforded quantitative conversion to the very sensitive complexes LVX 2, while in the presence of HX (X  FBr), ionic salts of the type [(HL)VX 2]X) were isolated. Deprotonation of the latter compounds with nitrogen bases afforded the former LVX 2 complexes. All complexes have been isolated and characterized by ESR, IR and UV-vis spectroscopy. Reaction of LVX 2 with H 2S and N 2NC 6H 5·B(C 2H 5) 3 led to complexes of the type LVY (YS and N C 6H 5·B(C 2H 5) 3).