Abstract
Mössbauer spectra in frozen aqueous ethanolic solution of complexes of the type [(PPIX)Fe(II)-(HisR) 2] are reported where HisR = histidine, N-α-acetyl histidine, pilocarpate or histamine. At alkaline pH 12.0, the complexes are found to be monomeric and low spin with quadrupole splittings (Δ E Q) similar to that of reduced cytochrome b 5. The Δ E Q values are typical of bis(imidazole) coordination to (protoporphyrinato IX)iron(II) (Δ E Q = 0.9–1.04 mm s −1). The results indicate that hydrogen bonding to the NH of the coordinated imidazole considerably decreases the Δ E Q values.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.