Phase studies and thermochemistry of the aluminium bromide–pyridine system
- 1 January 1967
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 392-394
- https://doi.org/10.1039/j19670000392
Abstract
Phase studies have shown that the compounds C5H5N,AlBr3 and 2C5H5N,AlBr3 melt congruently at 116·0 and 183·4–185·1°, respectively, and 3C5H5N,AlBr3 melts incongruently at 170°. The heats of formation (–ΔH1; kcal. mole–1) of the crystalline complexes from crystalline aluminium bromide and liquid pyridine at 25°, determined calorimetrically, are 32·6, 45·7, and 56·3, respectively. The heat of sublimation of the 1 : 1 adduct is 19·9, the gas-phase heat of formation 45·3, and the dissociation energy, D(C5H5N–AlBr3), 73·6 kcal. mole–1.Keywords
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