Skip navigation
Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3483
Title: Ruthenium-nitrosyl complexes derived from ligands containing two carboxylate functional groups and studies on the photolability of coordinated NO
Authors: Ghosh, Kaushik
Kumar S.
Kumar R.
Published in: European Journal of Inorganic Chemistry
Abstract: Ruthenium complexes [RuIII(L1)(PPh3) 2(Cl)] (1) and [RuIII(L2)(PPh3) 2(Cl)] (2) (in which L1H2 and L 2H2 are iminodiacetic acid and pyridine-2,6-dicarboxylic acid, respectively, and H stands for a dissociable proton) derived from the ligands that contain two carboxylate groups were synthesized and characterized. These complexes were treated with in situ generated NO derived from acidified nitrite solution, which afforded the formation of two {Ru-NO}6 complexes [Ru(L1)(PPh3)2(NO)](ClO4) (1a) and [Ru(L2)(PPh3)2(NO)](ClO4) (2a). The molecular structure of the representative complex [Ru(L 2)(PPh3)2(NO)](ClO4) (2a) was determined using X-ray crystallography. Characterization of complexes 1a and 2a by IR and NMR spectroscopic studies revealed the presence of {Ru-NO}6 species with S = 0 ground state. ESI-MS data also supported the formation of 1a and 2a. Exposure to UV light promoted rapid loss of NO from both ruthenium nitrosyls to generate RuIII photoproducts of the type [Ru(L)(PPh 3)2(S)](ClO4) (in which S stands for solvent). The quantum yields of NO photorelease for complexes 1a and 2a were measured using a chemical actinometry study. The NO released in solution was estimated using the Griess reagent, and the results were compared with the data obtained from sodium nitroprusside (SNP). A 2,2-diphenyl-1-picrylhydrazine (DPPH) radical quenching assay was performed to estimate the amount of generated reactive nitrogen species and/or reactive oxygen species under aerobic conditions during photolysis of NO. Ru-nitrosyl complexes [Ru(L1)(PPh3) 2(NO)](ClO4) (1a) and [Ru(L2)(PPh 3)2(NO)](ClO4) (2a) with a {RuNO}6 moiety were synthesized, and the crystal structure of 2a was determined. Photoreleased nitric oxide was quantified by Griess reaction; the amount of generated reactive N and/or O species was estimated by 2,2-diphenyl-1- picrylhydrazine (DPPH) radical quenching assay during photodissociation of NO. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Citation: European Journal of Inorganic Chemistry (2014), (9): 1454-1461
URI: https://doi.org/10.1002/ejic.201301225
http://repository.iitr.ac.in/handle/123456789/3483
Issue Date: 2014
Publisher: Wiley-VCH Verlag
Keywords: Nitric oxide
NO ligand
Photochemistry
Quenching
Ruthenium
ISSN: 14341948
Author Scopus IDs: 57204513823
7405769266
57208685185
Author Affiliations: Ghosh, K., 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
Kumar, R., 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]

Files in This Item:
There are no files associated with this item.
Show full item record


Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.