UNSPECIFIED (1993) THERMOCHEMISTRY OF THE AZIDE ANION - ASSIGNMENT OF DELTA(F)H(0)(N3-,G) USING VISCOSITY B-COEFFICIENT DATA. JOURNAL OF PHYSICAL CHEMISTRY, 97 (30). pp. 7876-7879. ISSN 0022-3654

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Abstract

Uncertainty concerning the magnitudes of key thermodynamic values at the heart of azide chemistry has prevailed for a number of years. The ''direct' experimental determination of quantities like DELTA(f)H0(N3-,g), differ quite markedly (some 50 kJ mol-1) from the values indicated from indirect thermochemical cycles via lattice energies. The viscosity B-coefficients of alkali metal azides in aqueous solution are utilised, in conjunction with a well-established correlation, to estimate these important quantities from a new standpoint. The following values constitute the best estimates via this route: DELTA(f)H0(N3-,g) = 189 +/- 5.2 and DELTA(f)H0(N3.,g) = 450.5 +/- 11.8 kJ mol-1 (based on the averaged electron affinity of the azide radical, A(e)(N3.,g) = 261 +/- 5.6 kJ mol-1 from recent studies). Estimates of the lattice energies of the azide salts are presented. A value for the bond dissociation energy D0(H-N3) is assigned to be 388 +/- 13 kJ mol-1.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry
Journal or Publication Title:	JOURNAL OF PHYSICAL CHEMISTRY
Publisher:	AMER CHEMICAL SOC
ISSN:	0022-3654
Date:	29 July 1993
Volume:	97
Number:	30
Number of Pages:	4
Page Range:	pp. 7876-7879
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/21110

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