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.
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