Infrared and Raman Spectra Studies on Isomultinuclear Organometallic Carbyne Compounds

The infrared and Raman spectra of five isomultinuclear organometallic carbyne compounds were studied. The results show that the introduction of N atom from TMEDA or P atom from DPPE to W atom (both N and P are strong σ-donor and weak π-acceptor) will decrease the bonding intensity of W≡C. The pressure tunning IR and Raman spectra of compound III indicate the presence of pressure-induced phase-transition near 20 kbar in it. There are two effects en the ν_(W≡C) of this compound with increasing pressure:the normal increasing the ν_(W≡C) wavenumber due to the shorting W≡C bond and increasing the W-CO π backbonding to decrease the ν_(W≡C) wavenumber.