Abstract

The57Fe Mossbauer spectra of substituted pentacyanoferrate /II/ complexes [/CN/5 FeII L]3− have been obtained for L=adenine, guanine, purine, caffeine, ethylene sulphide, dimethyl sulphoxide, and ammonia. The Mossbauer parameters are utilized to classify the various ligands according to their σ and π bonding abilities. A linear correlation between the Mossbauer isomer shift and the tetragonal distortion caused by the ligand L is proposed. Comparison between this linear correlation and the approximative method of Wentworth and Piper1 is made.

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