Abstract
IN a recent review1 of the dissociation energies of the gaseous monohalides of boron, aluminium, gallium and thallium, it was concluded that the best value for D 0″ (aluminium monobromide) is 105 k.cal. mole−1. Dr. P. Gross has now kindly directed my attention to the work of Semenkovich2, who has determined the standard heat of formation of gaseous aluminium monobromide by a thermochemical method similar to that used by Gross, Campbell, Kent and Levi3 for aluminium monofluoride and monochloride. Semenkovich obtains Q f(AlBrg) = + 1.1 k.cal. mole−1. With ΔS H(Al) = 77.4, Q f(Brg) = 26.71, and D 298″ – D 0″ = 0.85, D 0″(AlBr) = 102.2 k.cal mole−1. As with AlF and AlCl, this value is a little lower than two of the spectroscopic estimates from the state A 1Π, which, for AlBr, are 106.9 k.cal. by extrapolation, and >104.4 k.cal. from the highest observed vibrational level: it is, however, consistent with a predissociation limit which leads to D 0″ ⩽ 105.7 k.cal.
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References
Barrow, R. F., Trans. Faraday Soc., 56, 952 (1960).
Semenkovich, S. A., Zhurnal Prikladnoi Khimii, 30, 933 (1957).
Gross, P., Campbell, C. S., Kent, P. J. C., and Levi, D. L., Disc. Faraday Soc., 4, 206 (1948).
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BARROW, R. Dissociation Energy of Aluminium Monobromide. Nature 189, 480 (1961). https://doi.org/10.1038/189480a0
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DOI: https://doi.org/10.1038/189480a0
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