Chemical and spectroscopic conformation of an exogenous ligand bridge in half met hemocyanin. |
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Authors: | R S Himmelwright N C Eickman E I Solomon |
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Affiliation: | Massachusetts Institute of Technology Cambridge, Massachusetts 02139 USA |
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Abstract: | Half hemocyanin is shown to undergo a unique change at the Cu(II)?Cu(I) active site with temperature, exhibiting class II mixed valent properties at low temperature (The appearance of an intense near IR intervalence-transfer transition and a delocalized EPR spectrum). This requires a Cu(II)NNNCu(I) bridging geometry. The effects of CO coordination to half , combined with the presence of a low energy charge transfer transition, demonstrate that azide is also bridging at room temperature. Finally, half is found to be capable of coordination of a second at the copper(II) site. |
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Keywords: | To whom all correspondence should be sent. |
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