Synthesis and Characterization of Mononuclear Octahedral Titanium(IV) Complexes Containing Ti:O, Ti(O2), and Ti(OCH3)x (x = 1-3) Structural Units

The oxidation of [(Me 3 tacn)Ti III Br 3 ] (where Me 3 tacn is 1,4,7-trimethyl-1,4,7-triazacyclononane) in water with Na 2 [S 2 O 8 ] yields upon addition of NaClO 4 yellow-orange [(Me 3 tacn)Ti IV Br 3 ]ClO 4 (1). The series [(Me 3 tacn)Ti IV Br x (OCH 3 ) (3-x) )] + (x=2 (2); x=1 (3); x=0 (4)) has been synthesized by oxidation reactions of [(Me 3 tacn)TiBr 3 ] with air in acetonitrile/methanol mixtures and methanol as solvents