Photolytic and thermal properties of a new series of intramolecular bridged alkyl cobaloxime complexes

Abstract

The photolytic kinetic properties of a new series of intramolecular bridged alkyl cobaloxime complexes Br(O–C₃H₆-(dmgH))(dmgH))Co^III (2), [H₂O(O–C₃H₆-(dmg))(dmgH₂)]Co^III[ClO₄ (3), ]Py(O–C₃H₆-(dmg))(dmgH₂)[Co^III]ClO₄ (4), [Bzm(O–C₃H₆-(dmg))(dmgH₂)]Co^III[ClO₄ (5) and ]Im(O–C₃H₆-(dmg))(dmgH₂)[Co^III]ClO₄ (6) and their precursor aqua-(3-bromopropyl)cobaloximes (1) were investigated by UV-Vis spectroscopy. The products of photolytic solutions were characterized by both ESI-MS and ¹H-NMR techniques. Our results revealed a carbon-center radical that is produced from Co–C bond cleavage under photolysis might be linked to the equatorial ligand and thus retained in the proximity of Co^II-complex. The thermo-gravimetric analysis of complex 2 gives the same conclusion.