Neutron scattering spectra of hydridocarbonyls in the 900–200 cm–1energy region

Abstract

It is shown that neutron scattering spectroscopy is a powerful technique for characterizing vibrations of hydrogen atoms in simple and complex transition metal hydridocarbonyls. The spectra of HCo(CO)₄, H₂Fe(CO)₄, HMn(CO)₅, HCo(PF₃)₄, KHFe(CO)₄, H₃Mn₃(CO)₁₂ and CsHFe₃(CO)₁₁ are recorded and discussed, and a neutron “selection rule” is used to assign vibrations in the first three compounds. It is found that the hydrogen bending vibration for a hydrogen atom in a three centre-two-electron bond, is little displaced from that in an ordinary bond.