Preparation of a series of (imidazole)pentaaquachromium(III) complexes and kinetics of their reduction by 1-hydroxy-1-methylethyl radicals
Journal Article
·
· Inorganic Chemistry; (United States)
- Iowa State Univ., Ames (USA)
- Rudjer Boskovic Inst., Croatia (Yugoslavia)
A series of (imidazole)pentaaquachromium(III) complexes, (H{sub 2}O){sub 5}Cr(Im-X,Y){sup 3+} were prepared and characterized in acidic aqueous solution. These complexes are reduced by {sup {center dot}}C(CH{sub 3}){sub 2}OH radicals with rate constants that vary with substituents on the imidazole ring. At 25C the values of the rate constants, k/10{sup 5} L mol{sup {minus}1} s{sup {minus}1} (X,Y), are 1.1 (1-CH{sub 3}, H), 2.1 (2-CH{sub 3}, H), 3.8 (4-CH{sub 3}, H), 6.6 (H, H), 7.2 (4-CH{sub 3}, 5-CONH{sub 2}), and 16 (4-Cl, 5-Cl). A mechanism is proposed whereby the initial electron transfer takes place at coordinated imidazole, followed by a rapid intramolecular electron transfer to yield Cr(H{sub 2}O){sub 6}{sup 2+} and X,Y-ImH{sup +}.
- OSTI ID:
- 5977520
- Journal Information:
- Inorganic Chemistry; (United States), Journal Name: Inorganic Chemistry; (United States) Vol. 30:3; ISSN 0020-1669; ISSN INOCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKYL RADICALS
AQUEOUS SOLUTIONS
AZOLES
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHROMIUM COMPLEXES
COMPLEXES
DATA
DISPERSIONS
ETHYL RADICALS
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
HYDROXY COMPOUNDS
IMIDAZOLES
INFORMATION
KINETICS
METHYL RADICALS
MIXTURES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
RADICALS
REACTION KINETICS
REDUCTION
SOLUTIONS
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
400201* -- Chemical & Physicochemical Properties
ALKYL RADICALS
AQUEOUS SOLUTIONS
AZOLES
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHROMIUM COMPLEXES
COMPLEXES
DATA
DISPERSIONS
ETHYL RADICALS
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
HYDROXY COMPOUNDS
IMIDAZOLES
INFORMATION
KINETICS
METHYL RADICALS
MIXTURES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
RADICALS
REACTION KINETICS
REDUCTION
SOLUTIONS
SYNTHESIS
TRANSITION ELEMENT COMPLEXES