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

Abstract Whole series of fac- [Fe II (CN) x (CO) 3 I (3 −  x ) ] − ( x  = 1–3) generated by stepwise replacement of iodide from fac- [Fe II (CO) 3 I 3 ] − 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.