Substitution reactions of oxalato complex ions. VIII. Kinetics of the anation reaction of diaquobis(ethylenediamine)cobalt(III) ion by oxalate in acidic aqueous solution

1968 ◽  
Vol 7 (9) ◽  
pp. 1872-1876 ◽  
Author(s):  
P. M. Brown ◽  
G. M. Harris
Keyword(s):  
Aqueous Solution ◽  
Complex Ions ◽  
Substitution Reactions ◽  
Acidic Aqueous Solution ◽  
Kinetics Of ◽  
Anation Reaction

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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