Mechanism of Substitution Reactions in Complex Ions. III. Kinetics of Aquation of Some Cobalt(III) Complex Ions1,2

1953 ◽  
Vol 75 (13) ◽  
pp. 3089-3092 ◽  
Author(s):  
Ralph G. Pearson ◽  
Charles R. Boston ◽  
Fred Basolo
Keyword(s):  
Complex Ions ◽  
Substitution Reactions ◽  
Kinetics Of

Substitution reactions of some bis(2,2'-bipyridine) and mixed 2,2'-bipyridine, 2,2',2'-terpyridine complexes of ruthenium(II). II. The kinetics of substitution of nitrite and other nucleophiles

1968 ◽  
Vol 21 (4) ◽  
pp. 915 ◽  
Author(s):  
NR Davies ◽  
TL Mullins
Keyword(s):  
Aqueous Solution ◽  
Low Frequency ◽  
Single Step ◽  
Second Order ◽  
Complex Ions ◽  
Substitution Reactions ◽  
Arrhenius Parameters ◽  
Nitro Complexes ◽  
Nucleophilic Reagents ◽  
Kinetics Of

The rates of substitution of the complex ions [Ru11(H2O)bipytrpy]2+ and [Ru11(H2O)2 bipy2]2+, where bipy = 2,2'-bipyridine and trpy = 2,2',2"-terpyridine, by a number of nucleophilic reagents in aqueous solution, have been determined as a function of temperature. The reactions were observed to be second order and rates fall in the sequence Ni > NO2 > SCN-> pyridine. The range of Arrhenius parameters is very large with some unusually low frequency factors. The diaquo complex appears to undergo substitution leading to disubstituted derivatives in a single step. In the case of substitution by nitrite, there is evidence that the final products are nitro complexes formed by rapid isomerization of intermediate nitrito complexes.

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