Threshold-photoelectron spectroscopic study of methyl-substituted hydrazine compounds

The valence shell electronic structures of methylhydrazine (C[H.sub.3]NHN[H.sub.2]), 1,1-dimethylhydrazine ([(C[H.sub.3]).sub.2]NN[H.sub.2]) and tetramethylhydrazine ([(C[H.sub.3]).sub.4][N.sub.2]) are studied. A linear relationship between the ionization energy of a specific orbital and the inverse of the size of the molecule is shown and neutral and ion heats of formation for methyl-hydrazine, 1,1-dimethylhydrazine and tetramethylhydrazine are obtained from G3 calculations.