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- W2071724992 abstract "The Mossbauer spectra of Fe(por)X (por = tetraphenylporphinato, TPP, and tetrakis(p-chlorophenyl)porphinato, Tp-ClPP, dianions; X = Cl, Br and I) have been measured. They show varying quadrupolar pattern depending on the temperature: asymmetric broadening of the high-velocity line at higher temperatures, a symmetric doublet at a temperature Tr, and a reversal in asymmetry below Tr. The temperature dependence results from temperature-dependent spin-spin relaxation in high-spin iron(III) and the off-diagonal terms of the hyperfine operator, and reflects the ionic zero-field splitting. For a given X, Tr is higher and the quadrupole splitting, ΔeQ, is larger for Tp-ClPP derivatives than for TPP derivatives. The result is explained on the basis of the resonance effect of the p-chloro substituents of the meso-phenyl groups. When por is fixed, both the values of Tr and ΔEQ are in the order Cl < Br < I. This is interpreted as due to the predominantly ionic character of the bond between the halide and iron ions." @default.
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- W2071724992 date "1993-04-01" @default.
- W2071724992 modified "2023-09-29" @default.
- W2071724992 title "Spin relaxation in high-spin iron(III) complexes of tetraphenylporphine" @default.
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- W2071724992 doi "https://doi.org/10.1016/0168-583x(93)95220-y" @default.
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