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The heat capacity of N-dimethylaminodiborane was determined in the temperature range from 17° to 285°K by means of an adiabatic calorimeter. A first-order solid-solid transition was found at 199.9 ± 0.1 OK, with a latent heat of 7794 abs j moleI. The trip lepoint temperaturc was found to be 218.4 ± 0.2°K , and the heat of fusion to be 1,408 ± 30 abs j moleI. The measurements of the heat of vapo ri zation at 271.60 0 K (94.3 mIll Hg) yielded 30,119 ± 30 abs j mole I. The results of the vapor-press ure meas urements from 220° to 290 0 K can be represent ed by the equation

Heat capacity; heats of fusion, vaporization, and transition; and vapor pressure of N-dimethylaminodiborane, (CH3)2NB2H5