Controlling the oxidation of bis-tridentate cobalt(ii) complexes having bis(2-pyridylalkyl)amines: ligand vs. metal oxidation. Issue 33 (16th June 2017)

• Record Type: Journal Article
• Authors: Anjana, S.; Donring, S.; Sanjib, P.; Varghese, B.; Murthy, Narasimha N.
• Is Part Of: Dalton transactions. Volume 46:Issue 33(2017)
• Page Start: 10830
• Page End: 10836
• Publication Date: 2017-06-16
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c7dt01792h
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Two bis-tridentate chelated cobalt(ii ) complexes, which differ in the ligand structure by a methylene group, activate molecular oxygen (O2 ), and give different oxidation products. Abstract : Two bis-tridentate chelated cobalt(ii ) complexes, which differ in the ligand structure by a methylene group, activate molecular oxygen (O2 ), and give different oxidation products. The O2 reaction of [Co II (pepma)2 ] 2+ (1 ) with unsymmetrical 2-(2-pyridyl)- N -(2-pyridylmethyl)ethanamine (pepma) results in ligand oxidation, to the corresponding Co(ii ) imine complex [Co II (pepmi)2 ] 2+ (2 ). Contrastingly, the Co(ii ) complex [Co II (bpma)2 ] 2+ (3 ) of similar symmetrical bis(2-pyridylmethyl)amine (bpma), undergoes metal oxidation, yielding a cobalt(iii ) complex, [Co III (bpma)2 ] 2+ (4 ). The reversibility of the amine to imine conversion and the stability of the Co(ii ) imine complex (2 ) are investigated. Furthermore, the solution dynamics of Co(ii ) complexes are highlighted with the help of paramagnetic 1 H-NMR spectroscopy.