title: Nitric Oxide Reactivity of a Cu(II) Complex of an Imidazole-Based Ligand: Aromatic C-Nitrosation Followed by the Formation of N-Nitrosohydroxylaminato Complex.
abstract: A binuclear Cu(II) complex, 1, [Cu2(L-)2(OAc)](OAc) of imidazole-based ligand LH {LH = 2-(bis(2-ethyl-5-methyl-1H-imidazol-4-yl)methyl)phenol} was synthesized and characterized spectroscopically and structurally. Addition of an equivalent amount of nitric oxide (NO) by a gastight syringe to the acetonitrile:methanol (5:1, v/v) solution of complex 1 at room temperature resulted in the reduction of Cu(II) center to Cu(I) with concomitant C-nitrosation of the ligand. Spectroscopic characterization of the resulting Cu(I) complex (1a) of the C-nitrosylated ligand, L' {L' = 2-(bis(2-ethyl-5-methyl-1H-imidazol-4-yl)methyl)-4-nitroso-phenol} has been done. The Cu(I) complex, 1a, further reacted with NO to result in the corresponding N-nitrosohydroxylaminato complex, 2, [Cu2(L-ONNO)2](OAc)2through the formation of a Cu(I)-nitrosyl intermediate. A small fraction of the nitrosyl intermediate decomposed to the corresponding Cu(II) complex 3, [Cu(L')2], and N2O in a parallel reaction.
authors.affiliation: Department of Chemistry, Indian Institute of Technology Guwahati , North Guwahati, Assam 781039, India.
authors.forename: Hemanta
authors.initials: H
authors.lastname: Deka
authors.affiliation: Department of Chemistry, Indian Institute of Technology Guwahati , North Guwahati, Assam 781039, India.
authors.forename: Somnath
authors.initials: S
authors.lastname: Ghosh
authors.affiliation: Department of Chemistry, Indian Institute of Technology Guwahati , North Guwahati, Assam 781039, India.
authors.forename: Kuldeep
authors.initials: K
authors.lastname: Gogoi
authors.affiliation: Department of Chemistry, Indian Institute of Technology Guwahati , North Guwahati, Assam 781039, India.
authors.forename: Soumen
authors.initials: S
authors.lastname: Saha
authors.affiliation: Department of Chemistry, Indian Institute of Technology Guwahati , North Guwahati, Assam 781039, India.
authors.forename: Biplab
authors.identifier: http://orcid.org/0000-0002-0594-6749
authors.initials: B
authors.lastname: Mondal