
%0 Journal Article
%A Palmer, DA 
%T Volumes of Activation for the Base Hydrolysis of [Rh(NH<sub>3</sub>)<sub>5</sub>X]<sup>2+</sup> Complex Ions
%J Australian Journal of Chemistry
%D 1979/12/01
%V 32
%N 12
%P 2589-2595
%K 
%R https://doi.org/10.1071/CH9792589
%U https://www.publish.csiro.au/paper/CH9792589 
%X The pressure dependencies of the rates of base hydrolysis of [Rh(NH3)5X]2+ were measured at 313.2 K and &#956;1M, where X = Cl-, Br-, I- and NO3-, in the range 1-1500 bar. The respective &#916;&#957;&#8225;exp values are 19.3 ± 0.9, 20.2 ± 0.5, 20.4 ± 0.5 and 22.3 ± 0.9cm3 mol-1. The partial molar volumes of these complexes, as well as those of other relevant pentaamminerhodium(III) complexes, were also determined. The volume data are discussed in terms of the conventional dissociative conjugate base mechanism. The &#916;&#957;&#8225;exp for the aquation of [Rh(NH3)5NO3]2+ was found to be -6.9 ± 0.4cm3 mol-1 at 313.2K, [H+] 0.005M and &#956;0.1 M. An I mechanism is favoured for this process. 
