
TY  - JOUR
A1  - Fowless, AD 
A1  - Lawrance, GA 
A1  - Stranks, DR 
A1  - Sullivan, TR 
A1  - Vanderhoek, N 
T1  - The Effect of Pressure on the Anation of Diaquabis(ethane-1,2-diamine)cobalt(III) by Selenate and Sulfate, and on the Isomerization of the <I>trans</I>-Aquabis(ethane-1,2-diamine)(hydrogenselenito)cobalt(III) Ion
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1988
VL  - 41
IS  - 9
SP  - 1263
EP  - 1273
KW  - 
UR  - https://doi.org/10.1071/CH9881263 
N2  - The reversible nucleophilic substitution of cis-[Co(en)2(OH2)2]3+ (en = ethane-1,2-diamine) by sulfate and selenate at pH 2.0 was studied at elevated pressure, and activation volumes (&#916;V&#8225;) for anation and solvolysis were determined. The &#916;V&#8225; values for anation by sulfate and selenate were +8.3±0.5 and +8.5±0.4 cm3 mol-1 respectively, whereas solvolysis of sulfato and selenato complexes cis -[Co(en)2(OH2)(XO4)]+ gave &#916;V&#8225; values of -2.2±0.4 and -3.3±0.7 cm3 mol-1 respectively. The trans &#8594; cis [Co(en)2(OH2)(OSeO2H)]2+ isomerization studied at pH 1.0 and elevated pressure yielded &#916;V&#8225; + 7.2±0.4 cm3 mol-1. All reactions can be interpreted in terms of dissociative mechanisms. 
ER  -

