TY - JOUR
T1 - Reactivity of Hydrogen Atoms toward Some Cobalt (III) Complexes in Aqueous Solutions
AU - Halpern, Jack
AU - Rabani, Joseph
PY - 1966/2
Y1 - 1966/2
N2 - Kinetic studies on the reduction of various cobalt(III) complexes by hydrogen atoms are described. The hydrogen atoms were generated by Co60 γ irradiation of the solutions and the rates of reaction with thecobalt(III) complexes determined by competition with the reaction with ethanol. Rate constants ranging from 3.3 X 1010 to 2.0 X 107 M-1 sec-1 (at 26°) were determined for the reactions of H atoms with Co(NH3)5I2+, Co(NH3)5Br2+, Co-(NH3)5NCS2+, Co(NH3)5(H-fumarate)2+, Co(NH3)5Cl2+, Co(NH3)5N32+, Co(NH3)3(N02)3, Co(NH3)5N022+, Co-(NH3)5CN2+, and Co(CN)63-, along with upper limits for reactions with a number of other cobalt(III) complexes. In a number of cases the rates of reactions with the corresponding free ligands also were determined. The mechanisms of these reactions and the relation of the observed reactivity patterns for H atoms to those for other reductants are considered.
AB - Kinetic studies on the reduction of various cobalt(III) complexes by hydrogen atoms are described. The hydrogen atoms were generated by Co60 γ irradiation of the solutions and the rates of reaction with thecobalt(III) complexes determined by competition with the reaction with ethanol. Rate constants ranging from 3.3 X 1010 to 2.0 X 107 M-1 sec-1 (at 26°) were determined for the reactions of H atoms with Co(NH3)5I2+, Co(NH3)5Br2+, Co-(NH3)5NCS2+, Co(NH3)5(H-fumarate)2+, Co(NH3)5Cl2+, Co(NH3)5N32+, Co(NH3)3(N02)3, Co(NH3)5N022+, Co-(NH3)5CN2+, and Co(CN)63-, along with upper limits for reactions with a number of other cobalt(III) complexes. In a number of cases the rates of reactions with the corresponding free ligands also were determined. The mechanisms of these reactions and the relation of the observed reactivity patterns for H atoms to those for other reductants are considered.
UR - http://www.scopus.com/inward/record.url?scp=15544379008&partnerID=8YFLogxK
U2 - 10.1021/ja00956a015
DO - 10.1021/ja00956a015
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AN - SCOPUS:15544379008
SN - 0002-7863
VL - 88
SP - 699
EP - 704
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 4
ER -