FT-IR spectroscopic investigation of some Hofmann type complexes: M(2-(1-Cyclohexenyl)ethylamine)2Ni(CN)4 (M = Ni, Co)

New Hofmann type complexes in the form of M(CyHEA)2Ni(CN)4 (where CyHEA = 2-(1-cyclohexenyl)ethylamine; M = Ni or Co) have been prepared in powder form and their infrared spectra have been reported in the range of 4000–400 cm−1. The thermal behaviour of these complexes has been investigated by differential thermal analysis (DTA) and thermo-gravimetric analysis (TGA). The results suggest that these compounds are similar in structure to Hofmann type complexes and their structures consist of polymeric layers |M–Ni(CN)4|∞ with the CyHEA molecule bound to the metal atom (M).