
TY  - JOUR
A1  - Lantzke, IR 
A1  - Watts, DW 
T1  - 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
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1966
VL  - 19
IS  - 6
SP  - 969
EP  - 979
KW  - 
UR  - https://doi.org/10.1071/CH9660969 
N2  - 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. 
ER  -

