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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.
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References
- Murray, L.J., Dinca, M., Yano, J., Chavan, S., Bordiga, S., Brown, C.M. and Long, J.R. Highly-selective and reversible O2 binding in Cr3(1,3,5-benzenetricarboxylate)2. J. Am. Chem. Soc., 2010, 132(23), 7856-7857.
- Sun, Y., Chen, K., Jia, L. and Li, H. Toward understanding macrocycle specificity of iron on the dioxygen-binding ability: a theoretical study. Phys. Chem. Chem. Phys., 2011, 13(30), 13800-13808.
- Henrici‐Olivé, G. and Olive, S. Activation of molecular oxygen. Angew. Chem. Int. Ed., 1974, 13(1), 29-38.
- Sheldon, R.A. and Kochi, J.K., Chapter 4, Activation of Molecular Oxygen by Metal Complexes, In Metal-catalyzed Oxidations of Organic Compounds, p 71-119, ISBN 9780126393804, Academic Press, New York,1981.
- Sheldon, R.A., Metal-catalyzed Oxidations of Organic Compounds: Mechanistic Principles and Synthetic Methodology including Biochemical Processes. Elsevier, 2012.
- Buckingham, D.A., and Clark, C.R. In Comprehensive Coordination Chemistry, (Eds.) Wilkinson, G., Gillard, R.D. and McCleverty, J.A. Pergamon Press, Oxford, p 749-750, 1987.
- Tiné, M.R. Cobalt complexes in aqueous solutions as dioxygen carriers. Coord. Chem. Rev., 2012, 256(1), 316-327.
- Shahabadi, N., Kashanian, S. and Darabi, F. DNA binding and DNA cleavage studies of a water soluble cobalt(II) complex containing dinitrogen Schiff base ligand: The effect of metal on the mode of binding. Euro. J. Med. Chem., 2010, 45(9), 4239-4245.
- Calligaris, M., Nardin, G., Randaccio, L. and Ripamonti, A. Structural aspects of the synthetic oxygen-carrier NN′-ethylenebis-(salicylideneiminato) cobalt(II): structure of the addition compound with oxygen containing dimethylformamide. J. Chem. Soc. A: Inorg., Phys., Theo., 1970, 1069-1074.
- Floriani, C. and Calderazzo, F. Oxygen adducts of Schiff's base complexes of cobalt prepared in solution. J. Chem. Soc. A: Inorg., Phys., Theo., 1969, 946-953.
- Coleman, W.M. and Taylor, L.T. Dioxygen reactivity-structure correlations in manganese(II) complexes. Coord. Chem. Rev., 1980, 32(1), 1-31.
- Crumbliss, A.L. and Basolo, F. Monomeric cobalt-oxygen complexes. Science, 1969, 164(3884), 1168-1170.
- Calligaris, M., Nardin, G., Randaccio, L. and Tauzher, G. The structure of the 1:1 addition compound of molecular oxygen with NN′-ethylenebis(acetylacetoneiminato) cobalt(II) monopyridinate, Inorg. Nuc. Chem. Lett., 1973, 9(4), 419-422.
- Rodley, G.A. and Robinson, W.T. Structure of a monomeric oxygen-carrying complex, Nature, 1972, 235, 438.
- Chung, L.Y., Constable, E.C., Lewis, J., Raithby, P.R. and Kaye, P.T. Transition metal complexes of substituted 2,2′-biquinolines. Part 1. The crystal and molecular structures of [8,8′-bis(aminomethyl)-2,2′-biquinoline] dichloromanganese(II) and [8,8′-bis(aminomethyl)-2,2′-biquinoline] chlorocopper(II) chloride. J. Chem. Soc. Dalton Trans., 1988, (8), 2121-2125.
- McGarvey, B.R. and Carlin, R.L. Transition Metal Chemistry. Vol. 3, Marcel Dekker, New York, p 129-130.
- Figgis, B.N. and Lewis, J. The magnetic properties of transition metal complexes, Prog. Inorg. Chem., 1964, 6, 37-239.
- Hoffman, B.M., Diemente, D.L. and Basolo, F. Electron paramagnetic resonance studies of some cobalt(II) Schiff base compounds and their monomeric oxygen adducts. J. Am. Chem. Soc., 1970, 92(1), 61-65.
References
Murray, L.J., Dinca, M., Yano, J., Chavan, S., Bordiga, S., Brown, C.M. and Long, J.R. Highly-selective and reversible O2 binding in Cr3(1,3,5-benzenetricarboxylate)2. J. Am. Chem. Soc., 2010, 132(23), 7856-7857.
Sun, Y., Chen, K., Jia, L. and Li, H. Toward understanding macrocycle specificity of iron on the dioxygen-binding ability: a theoretical study. Phys. Chem. Chem. Phys., 2011, 13(30), 13800-13808.
Henrici‐Olivé, G. and Olive, S. Activation of molecular oxygen. Angew. Chem. Int. Ed., 1974, 13(1), 29-38.
Sheldon, R.A. and Kochi, J.K., Chapter 4, Activation of Molecular Oxygen by Metal Complexes, In Metal-catalyzed Oxidations of Organic Compounds, p 71-119, ISBN 9780126393804, Academic Press, New York,1981.
Sheldon, R.A., Metal-catalyzed Oxidations of Organic Compounds: Mechanistic Principles and Synthetic Methodology including Biochemical Processes. Elsevier, 2012.
Buckingham, D.A., and Clark, C.R. In Comprehensive Coordination Chemistry, (Eds.) Wilkinson, G., Gillard, R.D. and McCleverty, J.A. Pergamon Press, Oxford, p 749-750, 1987.
Tiné, M.R. Cobalt complexes in aqueous solutions as dioxygen carriers. Coord. Chem. Rev., 2012, 256(1), 316-327.
Shahabadi, N., Kashanian, S. and Darabi, F. DNA binding and DNA cleavage studies of a water soluble cobalt(II) complex containing dinitrogen Schiff base ligand: The effect of metal on the mode of binding. Euro. J. Med. Chem., 2010, 45(9), 4239-4245.
Calligaris, M., Nardin, G., Randaccio, L. and Ripamonti, A. Structural aspects of the synthetic oxygen-carrier NN′-ethylenebis-(salicylideneiminato) cobalt(II): structure of the addition compound with oxygen containing dimethylformamide. J. Chem. Soc. A: Inorg., Phys., Theo., 1970, 1069-1074.
Floriani, C. and Calderazzo, F. Oxygen adducts of Schiff's base complexes of cobalt prepared in solution. J. Chem. Soc. A: Inorg., Phys., Theo., 1969, 946-953.
Coleman, W.M. and Taylor, L.T. Dioxygen reactivity-structure correlations in manganese(II) complexes. Coord. Chem. Rev., 1980, 32(1), 1-31.
Crumbliss, A.L. and Basolo, F. Monomeric cobalt-oxygen complexes. Science, 1969, 164(3884), 1168-1170.
Calligaris, M., Nardin, G., Randaccio, L. and Tauzher, G. The structure of the 1:1 addition compound of molecular oxygen with NN′-ethylenebis(acetylacetoneiminato) cobalt(II) monopyridinate, Inorg. Nuc. Chem. Lett., 1973, 9(4), 419-422.
Rodley, G.A. and Robinson, W.T. Structure of a monomeric oxygen-carrying complex, Nature, 1972, 235, 438.
Chung, L.Y., Constable, E.C., Lewis, J., Raithby, P.R. and Kaye, P.T. Transition metal complexes of substituted 2,2′-biquinolines. Part 1. The crystal and molecular structures of [8,8′-bis(aminomethyl)-2,2′-biquinoline] dichloromanganese(II) and [8,8′-bis(aminomethyl)-2,2′-biquinoline] chlorocopper(II) chloride. J. Chem. Soc. Dalton Trans., 1988, (8), 2121-2125.
McGarvey, B.R. and Carlin, R.L. Transition Metal Chemistry. Vol. 3, Marcel Dekker, New York, p 129-130.
Figgis, B.N. and Lewis, J. The magnetic properties of transition metal complexes, Prog. Inorg. Chem., 1964, 6, 37-239.
Hoffman, B.M., Diemente, D.L. and Basolo, F. Electron paramagnetic resonance studies of some cobalt(II) Schiff base compounds and their monomeric oxygen adducts. J. Am. Chem. Soc., 1970, 92(1), 61-65.