Model studies of azide binding to functional analogues of CcO.
N3- binding to a functional model of CcO is investigated in its Fe3+, Fe3+Cu+, and Fe3+Cu2+ forms. A combination of EPR and FTIR indicates that N3- binds in a bridging mode in the bimetallic sites and signature N3- bands are identified for several forms of N3- binding to the site. The presence of the distal metal increases the binding affinity of N3-. This bridging enables antiferromagnetic interaction between the two metal centers in the Fe3+Cu2+ state, which results in an EPR-silent ground state.
Collman
James P
JP
Department of Chemistry, Stanford University, Stanford, CA 94305, USA. jpc@stanford.edu
Dey
Abhishek
A
Decréau
Richard A
RA
Yang
Ying
Y
D001386:Azides / Q000737:chemistry*; D001665:Binding Sites; D003576:Electron Transport Complex IV / Q000737:chemistry*; D008958:Models, Molecular; D013053:Spectrophotometry; D017550:Spectroscopy, Fourier Transform Infrared
D001386:Azides; D003576:Electron Transport Complex IV