Photodissociation of (DMSO)2Fe(II)PPIX to form a transient five-coordinate complex as studied using transient resonance Raman spectroscopy
✍ Scribed by R. E. Nalliah; E. W. Findsen
- Publisher
- John Wiley and Sons
- Year
- 1993
- Tongue
- English
- Weight
- 495 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0377-0486
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✦ Synopsis
Abstract
Resonance Raman spectra of iron(II) protoprophyrin IX [Fe(II)PP] in dimethyl sulfoxide (DMSO) and deuterated DMSO were obtained at high and low photon densities using 10 ns laser pulses. At low photon density, comparison of the Raman spectra of the complex with those of carbonmonoxy‐hemoglobin indicates that a low‐spin, six‐coordinate (DMSO)~2~Fe(II)PP complex exists; at high photon density, spectral comparisons with deoxyhemoglobin and the 2‐methylimidazole heme complex (2‐MeIm)Fe(II)PP indicate that a transient high‐spin, five‐coordinate complex is formed by photodissociation of a DMSO ligand. This phenomenon is reversible and observable on a 10 ns time‐scale.