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2-Furan carboxaldoxime (anti-form) or anti-furan 2-aldoxime (FDH) forms octahedral complexes of the type M(FDH) 2 Cl 2  (M = Mn, Co, Ni, Cu and Zn) and M(FDH) 3 Cl 3  (M = Cr and Fe). The infra red spectral studies have revealed that the coordination of the metal involved the oxime oxygen and the furan ring oxygen. However, the ligand acts as bidentate in case of M(FDH) 2 Cl 2  while it is monodentate in M(FDH) 3 Cl 3 . The M-O bands in the infrared spectra may be taken as a criterion for the denticity of the ligand in its various metal complexes. Bands at 670-630 cm -1  and around 450 cm- 1  indicate the bidentate ligand, while the absence of the band at 670-630 cm- 1  reveals monodenticity. The : C=N-stretching frequency has been found to increase with decreasing stability of the bivalent metal complexes, while it is insensitive in case of the trivalent metal complexes.

Infrared Spectral Studies of Metal Chelates of 2-Furan Carboxaldoxime