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

The photolytic kinetic properties of a new series of intramolecular bridged alkyl cobaloxime complexes Br(O-C(3)H(6)-(dmgH))(dmgH))Co(III)(2), H(2)O(O-C(3)H(6)-(dmg))(dmgH(2))]Co(III)ClO(4)(3), ]Py(O-C(3)H(6)-(dmg))(dmgH(2))Co(III)]ClO(4)(4), Bzm(O-C(3)H(6)-(dmg))(dmgH(2))]Co(III)ClO(4)(5) and ]Im(O-C(3)H(6)-(dmg))(dmgH(2))Co(III)]ClO(4)(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 (1)H-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.