Dioxygen Binding by Cobalt(II) Complexes of 8,8'-bis(aminomethyl)-2,2'-biquinoline

Authors

Muhammad S. Khan, Department of Chemistry, College of Science, Sultan Qaboos University, P.O. Box: 36, PC 123, Al-Khod, Muscat, Sultanate of Oman
Nawal K. Al-Rasbi, Department of Chemistry, College of Science, Sultan Qaboos University, P.O. Box: 36, PC 123, Al-Khod, Muscat, Sultanate of Oman
Edwin C.Constable, Department of Chemistry, University of Basel, Spitalstrasse 51, CH-4056 Basel, Switzerland

Abstract

A new series of Co(II) complexes of the type CoLX2 , where Lis a tetra-dentate ligand 8,8'-bis(aminomethyl)-2,2'-biquinoline and X= SCN–, BF4–, I– or NO3– , have been synthesized and characterized. The complexes have magnetic moments in the range typical of a low-spin d7 Co(II) center. The interaction of these Co(II) complexes with dioxygen was studied by E.S.R. spectroscopy. A dicobalt(III) peroxo-bridged complex was formed in DMF solution, associated with the formation of an E.S.R.-silent solution compatible with the formation of low-spin d6 Co(III) species. Similar behavior was also observed for the interaction of these Co(II) complexes with dioxygen in the presence of ancillary ligands such as pyridine and 2-methylimidazole. The dioxygen complexes proved successful as oxygen carrier oxidation catalysts for tripehnylphosphine and 2,6-bis(t-butyl)phenol.

Recommended Citation

Khan, Muhammad S.; Al-Rasbi, Nawal K.; and C.Constable, Edwin (2014) Dioxygen Binding by Cobalt(II) Complexes of 8,8'-bis(aminomethyl)-2,2'-biquinoline, Sultan Qaboos University Journal For Science: Vol. 19: Iss. 2, 21-28.
DOI: https://doi.org/10.24200/squjs.vol19iss2pp21-28
Available at: https://squjs.squ.edu.om/squjs/vol19/iss2/6