Synthesis of fac-[FeII(CN)(CO)3I2]− and chemistry of the fac-[FeII(CN)x(CO)3I(3 − x)]− series (x = 1–3)

Whole series of fac-[FeII(CN)x(CO)3I(3 − x)]− (x = 1–3) generated by stepwise replacement of iodide from fac-[FeII(CO)3I3]− by cyanide were isolated and structurally characterized. The infrared trend of this series demonstrates the effect of the electronic properties of ligands on the coordinated CO stretching frequencies.

Graphical abstractWhole series of fac-[FeII(CN)x(CO)3I(3 − x)]− (x = 1–3) generated by stepwise replacement of iodide from fac-[FeII(CO)3I3]− by cyanide were isolated and structurally characterized. The infrared trend of this series demonstrates the effect of the electronic properties of ligands on the coordinated CO stretching frequencies.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Mono-cyano fac-[FeII(CN)(CO)3I2]− was isolated and structural characterized. ► Reactions between fac-[FeII(CO)3I3]− and 1, 2 or 3 equivalents of cyanide were studied. ► CO stretching frequencies of fac-[FeII(CN)x(CO)3I(3 − x)]− (x = 1, 2 or 3) series follows neat trend.