INFRARED SPECTROSCOPIC STUDY OF DERIVATIVES OF COBALT TRICARBONYL NITROSYL

Author Institution: Department of Chemistry, Princeton University“Infrared spectra in the CO and NO stretching region of mono and disubstituted derivatives of $Co(CO)_{3}N0$ in which CO is replaced by $PCl_{3}, PCl_{2} (C_{6}H_{5}), PCl(C_{6}H_{5})_{2}, P(C_{6}H_{5})_{3}$, p-tolyl isonitrile, t-butyl isonitrile and orthophenanthroline are recorded. The $\pi$-electron accepting abilities of coordinated CO and NO are compared and a ``spectrochemical series’’ for $\pi$-bonding ligands is proposed.