
%0 Journal Article
%A Lantzke, IR 
%A Watts, DW 
%T Octahedral cobalt(III) complexes in dipolar aprotic solvents. VI. Spectrophotometric determination of ion association of halide ions with <I>cis</I>-chlorodimethylformamidebisethylenediaminecobalt(III) ion and <I>cis</I>-chlorobromobisethylenediaminecobalt(III)ion in anhydrous NN-dimethylformamide
%J Australian Journal of Chemistry
%D 1966/06/01
%V 19
%N 6
%P 969-979
%K 
%R https://doi.org/10.1071/CH9660969
%U https://www.publish.csiro.au/paper/CH9660969 
%X Using a spectrophotometric technique the ion association constants for three systems of octahedral cobalt complexes and halide ions have been determined at three temperatures in NN-dimethylformamide. The values of K, &#916;Hº, and &#916;Sº for each system have been calculated. At 30º they are as follows:     cis-[CoCl(DMF) en2]2+ + Cl- &#8596; ion pair    K=1.51±0.03 x 104 1.mole-1(&#916;H0= 0.93 ± 0.02 kcal mole-1,&#916;Sº= 22.l+0.4 e.u)   cis-[CoCl(DMF) en2]2++2Cl- &#8596; ion triplet  K= 1.21±0.05 X 106 1.2 mole-2(&#916;Hº=-3.8±0.lkcal mole-1, &#916;Sº=15.41± 0.5 e.u)  cis-[CoCl(DMF) en2]2++Br- &#8596; ion pair  K= 9.20±0.18 X 103 1.1 mole-1(&#916;Hº=-7.2±0.lkcal mole-1, &#916;Sº=42± 1.0 e.u)    cis-[CoBrCl en2]+ + Br- &#8596; ion pair    K = 690±l41. mole-1 (&#916;Hº = 1.27±0.03 kcal mole-1, &#916;Sº= 8.8±0.2 e.u.)    The dependence of the measured K, the association constant, on the wavelength of measurement, small amounts of water in the solvent, and the anion of the complex salt, has also been investigated. 
