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Dual Pathways in the Oxidation of an Osmium(III) Guanidine Complex. Formation of Osmium(VI) Nitrido and Osmium Nitrosyl Complex
- Source :
- Inorganic Chemistry. 56:2022-2028
- Publication Year :
- 2017
- Publisher :
- American Chemical Society (ACS), 2017.
-
Abstract
- The guanidine moiety of arginine is involved in the active sites of a variety of enzymes, such as nitric oxide synthase (NOS) and NiFe hydrogenase. In this paper we aim to investigate the effects of a metal center on the oxidation of guanidine, which should provide an interesting comparison with the biological aerobic oxidation of arginine catalyzed by NOS. We studied the oxidation of an osmium(III) guanidine complex, mer-[Os(L){N(H)C(NH2)2}(CN)3]−, (OsG, HL = 2-(2-hydroxyphenyl)benzoxazole) by m-chloroperbenzoic acid (m-CPBA), which is potentially an O atom transfer reagent, and by (NH4)2[CeIV(NO3)6], which is a one-electron oxidant. With m-CPBA, mer-[Os(NO)(L)(CN)3]− (mer-OsNO) is the product, while with CeIV, mer-[OsVI(N)(L)(CN)3]− (mer-OsN) is formed instead. The crystal structures of mer-OsNO and mer-OsN were determined by X-ray crystallography. The mechanisms for the oxidation of OsG by m-CPBA and CeIV are proposed.
- Subjects :
- Arginine
010405 organic chemistry
Stereochemistry
chemistry.chemical_element
Crystal structure
Benzoxazole
010402 general chemistry
01 natural sciences
Medicinal chemistry
0104 chemical sciences
Catalysis
Inorganic Chemistry
chemistry.chemical_compound
chemistry
Reagent
Moiety
Osmium
Physical and Theoretical Chemistry
Guanidine
Subjects
Details
- ISSN :
- 1520510X and 00201669
- Volume :
- 56
- Database :
- OpenAIRE
- Journal :
- Inorganic Chemistry
- Accession number :
- edsair.doi.dedup.....72edd405c12d07164e956da6017b327d