NOTES
Feb., 1960
+ C'[sin + sin(+k + 2 ~ / p +) . . . . . ])e-6'RT d+k c$k
(7).
As before, the expressions in brackets are identically zero. Conclusion.-Equation 1 applies not only to free rotation, but to the more general case of rotational barriers of twofold or higher symmetry. Experimental electric moments deviating from those predicted by this equation thus indicate non-symmetrical barriers or interactions between rotating groups.
THE HEAT OF COMBUSTION OF TETRAMETHYLTETRAZENE AND 1,l-DIMETHYLHYDRAZINE BY TERENCE hl. DONOVAN, C. HOWARDSHOMATE WILLIAMR. MCBRIDE
AND
Chemistry Division. Research Department, U . S . Naval Ordnance Test Statzon, Chzna Lake, Californzo Received September 2%,lQbQ
Interest in 1,l-dimethylhydrazine and related compounds for consideration as propellants for rocket propulsion applications led to the present experimental work for the determination of the heat of combustion of tetramethyltetrazene, the lowest alkyl homolog of the 2-tetrazenes >N-N= N-N
