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• W2013790652 endingPage "270" @default.
• W2013790652 startingPage "263" @default.
• W2013790652 abstract "Iron-57 Mössbauer spectra at 80 K have been recorded for a series of bis ligated complexes of iron(III) protoporphyrinate IX (3,7,12,17-tetramethyl-8,13-divinylporphyrin-2,18-dipropionate)[FeL]+ with imidazole (Him), 1-methylimidazole (1Me-im), and 2-methylimidazole (2Me-im). The spectra were recorded in frozen solutions of dimethyl sulphoxide (dmso), acetone, and 50%(v/v) ethanol–water and also in the presence of hydrogen-bonding agents such as trifluoroethanol or 1,10-phenanthroline in acetone. This is the first report of Mössbauer spectroscopic studies on the solvent dependence of a series of substituted imidazole complexes of [FeLCl]. Significant new results are obtained which are interpreted in the light of reported e.s.r., n.m.r., and electronic absorption data. A value of 2.43 mm s–1 for the quadrupole splitting (ΔEQ) of the imidazolate complex [FeL(Him)(im)] is assigned to a parallel orientation of the planar axial ligands, whereas a value of ΔEQ= 1.87 mm s–1 for the [FeL(2Me-im)2]+ is assigned to a perpendicular orientation of the imidazole planes. Large linewidths of about 0.6–0.98 mm s–1 are attributed to the presence of a statistical distribution of imidazole planes around the thermodynamically stable arrangement. The influences of hydrogen bonding on the Mössbauer parameters are discussed. The 2Me-im complex and the 1Me-im complex in dmso show slow spin–lattice relaxation at 80 K." @default.
• W2013790652 created "2016-06-24" @default.
• W2013790652 creator A5021004747 @default.
• W2013790652 creator A5076263008 @default.
• W2013790652 date "1990-01-01" @default.
• W2013790652 modified "2023-10-18" @default.
• W2013790652 title "Mössbauer studies on cytochrome b models: bis ligated complexes of iron(<scp>III</scp>) protoporphyrinate IX with imidazole and substituted imidazoles" @default.
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• W2013790652 doi "https://doi.org/10.1039/dt9900000263" @default.
• W2013790652 hasPublicationYear "1990" @default.
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