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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3487
Title: Syntheses, structures and properties of ruthenium complexes of tridentate ligands: Isolation and characterization of a rare example of ruthenium nitrosyl complex containing {RuNO}5 moiety
Authors: Ghosh, Kaushik
Kumar R.
Kumar S.
Meena J.S.
Published in: Dalton Transactions
Abstract: Novel ruthenium complexes [Ru(L1)(NO)Cl2] (1), [Ru(L2)(PPh3)Cl2] (2), [Ru(L 2)(PPh3)(NO2)Cl] (3) and [Ru(L 2)(PPh3)(NO)Cl](ClO4)2 (4) (where L1H = N′-phenyl-N′-(pyridin-2-yl)picolinohydrazide and L2 = (1-phenyl-1-(pyridin-2-yl)-2-(pyridin-2-ylmethylene)hydrazine) were synthesized. These complexes were characterized by using IR, UV-Vis, elemental analysis, electrochemical and NMR spectral studies. The molecular structures of nitrosyl complexes 1 and 4 were determined by X-ray crystallographic studies. Complexes 1 and 4 readily released NO under visible and ultraviolet light and free NO was transferred to reduced myoglobin. The amount of photoreleased NO was estimated using Griess reagent assay. During photolysis of NO, the generation of reactive nitrogen or/and reactive oxygen species was determined by DPPH (2,2-diphenyl-1-picrylhydrazine) radical quenching studies under aerobic conditions. A paramagnetic complex [Ru(L 2)(PPh3)(NO)Cl](NO3)3 (5) was synthesized via chemical oxidation of 4 with an excess of ceric ammonium nitrate (CAN) in acetonitrile. Complex 5 was characterized by UV-Vis, IR, elemental analysis and EPR spectral studies which authenticated the presence of the {RuNO}5 moiety in 5. Theoretical investigation by DFT calculation supported the oxidation of complex 4 having {RuNO}6 species and the formation of 5 containing {RuNO}5. © 2013 The Royal Society of Chemistry.
Citation: Dalton Transactions (2013), 42(37): 13444-13452
URI: https://doi.org/10.1039/c3dt00027c
http://repository.iitr.ac.in/handle/123456789/3487
Issue Date: 2013
ISSN: 14779226
Author Scopus IDs: 57204513823
57208685185
7405769266
55846423900
Author Affiliations: Ghosh, K., Department of Chemistry, Indian Institute of Technology, Roorkee, Roorkee-247667 Uttarakhand, India
Kumar, R., Department of Chemistry, Indian Institute of Technology, Roorkee, Roorkee-247667 Uttarakhand, India
Kumar, S., Department of Chemistry, Indian Institute of Technology, Roorkee, Roorkee-247667 Uttarakhand, India
Meena, J.S., Department of Chemistry, Indian Institute of Technology, Roorkee, Roorkee-247667 Uttarakhand, India
Corresponding Author: Ghosh, K.; Department of Chemistry, Indian Institute of Technology, Roorkee, Roorkee-247667 Uttarakhand, India; email: ghoshfcy@iitr.ernet.in
Appears in Collections:Journal Publications [CY]

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