Crystallographic and infrared spectroscopic study of bond distances in Ln[Fe(CN)6]·4H2O (Ln=lanthanide)

Along with crystallographic data of Ln[Fe(CN)6]·4H2O (Ln=lanthanide), the infrared spectra are reassigned to examine bond length trends across the series of Ln. The changes in mean Ln–O, Ln–N, Ctriple bond; length of mdashN and Fe–C distances are discussed and the bond natures of Ln–N and Ln–O are studied by bond length linear or quadratic fitting and comparisons with relevant ionic radii. The two different Ctriple bond; length of mdashN bond distances have been simulated by the covalo-electrostatic model.