Five new complexes are reported with nitromethane as a ligand, viz. [M(CH3NO2)6]2+[FeCl4]2− where M is Mg(II), Mn(II), Fe(II), Co(II) and Ni(II). They are identified by chemical analysis and with the aid of physical measurements. The NO2 rocking mode (BI) shifts to higher frequencies; no shift in the NO stretching frequencies has been observed. In the far infrared a metal‐dependent absorption band is observed, which is attributed to the metal‐ligand stretching vibration. It is noticed that the relative size and stability of the anion influences such quantities as formation of the complex in the first place, shifts in ligand vibrational frequencies, ligand field transitions.
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Driessen et al. (1969) studied this question.