Chromium complex energy parameter

Activation parameters associated with k were determined at pH 10, 12, and high [OH ], but no dissection into values for the elementary steps was attempted/ The complete thermal, photophysical, and photochemical pathways are summarized in Scheme 1. Very similar results have been obtained for [Cr(bipy)3] " using laser flash photolysis with conductivity and visible spectral detection. However, the pKa of the aquointermediate was found to be less than 2, and it is suggested that this may indicate that this intermediate has a Gillard-type covalent hydrate structure rather than a seven-coordinate chromium(III) structure. The preference, however, is for a seven-coordinate intermediate. Energy transfer from the Eg excited state of [Cr(bipy)3] to a series of cobalt(III) complexes has also been studied. The wavelength dependence of the phosphorescence yields of [Cr(en)3] is also available. ... 

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