RAMAN-STUDY OF THE MECHANISMS OF FORMATION OF WATER MONOMETHYLHYDRAZINE SOLID MIXTURES

Water-monomethylhydrazine (MMH) mixtures have been investigated by means of Raman spectroscopy for the entire concentration range at room temperature and vs. temperature for some mixtures. The Raman spectra of the liquid mixtures have shown that several species coexist in solution. Spectroscopic features have been assigned to MMH dimers and MMH n-hydrates, confirming previous investigations performed in our laboratories using other techniques. It has been shown that solvation of MMH had a major influence on the C-N-N skeleton vibrations. For highly concentrated solutions in MMH, the presence of a high percentage of MMH dimers has been confirmed. A preliminary study of the effects of temperature on some water-MMH mixtures has shown that the skeleton frequencies are also perturbed by cooling.