Thermochromism of the Methanol Solution Containing Cobalt(II)-dioxime Complex and Tributylpho sphine
1986 Volume 1986 Issue 6 Pages 771-774
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1986 Volume 1986 Issue 6 Pages 771-774
The methanol solution of Co(dmgBF2)2 (the BF2 capped species of bis(dimethylglyoximato)-cobalt(II) complex, Fig.1) containing a excess (with a mole ratio of about 1-6: 1) of tributylphosphine (P(n-C4H9)3) was remarkably thermochromic. The solution which was purple at higher temperature than -20°C became blue at lower temperature than -40°C, and the color change was reversible. The thermal change of the visible absorption spectra of the solution, showed that the patterns of spectra at lower and higher temperatures are quite similar to those observed at higher and lower concentration ranges of tributhylphosphine. It is suggested from the visible absorption spectra and ESR spectra that the thermochromism of Co(dmgBF2)2-P(n-C4H9)3-methanol solution is due to the shift of equiliblium between CoII(dmgBF2)2·P(n-C4H9)3 (purple) and CoI(dmgBF2)2·P(n-C4H9)3 (blue), and is th e same sort of change observed in varying concentrations of tributylphosphine.
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