Effects of imidazole deprotonation on vibrational spectra of high-spin iron(II) porphyrinates.

ABSTRACT: The effects of the deprotonation of coordinated imidazole on the vibrational dynamics of five-coordinate high-spin iron(II) porphyrinates have been investigated using nuclear resonance vibrational spectroscopy. Two complexes have been studied in detail with both powder and oriented single-crystal measurements. Changes in the vibrational spectra are clearly related to structural differences in the molecular structures that occur when imidazole is deprotonated. Most modes involving the simultaneous motion of iron and imidazolate are unresolved, but the one mode that is resolved is found at higher frequency in the imidazolates. These out-of-plane results are in accord with earlier resonance Raman studies of heme proteins. We also show the imidazole vs imidazolate differences in the in-plane v

SUBMITTER: Hu C 

PROVIDER: S-EPMC3613136 | biostudies-literature | 2013 Mar

REPOSITORIES: biostudies-literature