Effect of Pressure on the Fe–C Bond in Substituted Cyanides

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Abstract
The effect of pressure has been studied on the bonding in four nitroprussides and in Na3(CN)5NH3, using Mössbauer resonance. At atmospheric pressure, the spectrum consists of low‐spin Fe(II) with a very high electron density at the iron nucleus and a large quadrupole splitting. At modest pressure and high temperature a single peak appears with approximately the isomer shift of the initial pair. This is attributed to a decrease in the asymmetry due to changes in the Fe–NO bond. At high pressures and high temperatures very large conversion to high‐spin Fe(II) is observed. This is attributed to a large decrease in the back donation of Fe electrons to the ligands.

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