Infrared Studies of Transition-Metal Nitrosyl (14NO and 15NO) Complexes—Nitrosylruthenium(III), Nitrosylchromium(II) and Nitrosylcobalt(II) Complexes

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Abstract
For K2[RuX5(NO)] (X=Cl and Br), K3[Cr(CN)5(NO)]·H2O, [Cr(NH3)5(NO)]X2 (X=Cl and ClO4) and black-[Co(NH3)5(NO)]Cl2, it was attempted to determine the coordinating atom of the nitrosyl group to the metal atom and to assign the skeletal vibrations between the metal and the nitrosyl group by measuring the effect of the nitrogen isotope 15N on infrared spectra. The isotopic shifts for the 15NO-complex to the 14NO-complex were calculated for two kinds of a linear three-body model, M–N–O and M–O–N (M=metal atom), and the calculated shifts were compared with the observed ones. For nitrosylruthenium and nitrosylchromium complexes, the M–N–O arrangement was found, and of the two absorption bands in the region 530–620 cm−1, the higher wave number was assigned to the M–N stretching vibration and the lower one to the M–N–O bending vibration. For black-[Co(NH3)5(NO)]Cl2, the Co–O–N arrangement was found.