THE INTERACTION OF BORON TRIFLUORIDE WITH HYDRAZINE

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Abstract
Boron trifluoride and anhydrous hydrazine react rapidly at 25° invacuo yielding a 1:1 complex compound, BF3•N2H4 (m.p. 87°), while at higher temperatures, or with diethyl ether as solvent, they form complex mixtures containing 52.2 to 63.5 mole percent BF3; but in tetrahydrofuran solution the 2:1 adduct, 2BF3•N2H4 (m.p. 260°) is formed. The X-ray powder diffraction pattern of BF3•N2H4 consists of 28 lines from which a unit cell with triclinic symmetry was calculated. The thermal decomposition of BF3•N2H4 is complex, yielding in part N2, NH3, NH4BF4, and BN. Hydrolysis of BF3•N2H4 yields a mixture of hydroxyfluoroborate ions. At −80°, BF3•N2H4 absorbs NH3 to form a diammoniate which liberates NH3 slowly at higher temperatures. Partial displacement of BF3 from BF3•N2H4 by HCl and partial absorption of HCl by BF3•N2H4 occur simultaneously at 110°.Infrared spectra of BF3•N2H4 and 2BF3•N2H4 have been measured in the range of 4000 to 650 cm−1 and frequency assignments have been made.

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