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The enthalpies of formation of bis(dimethylamino)cyanophosphine, (dimethylamino)dicyanophosphine, and tricyanophosphine

✍ Scribed by H.M.A. Al-Maydama; Arthur Finch; P.J. Gardner; A.J. Head

Book ID: 102573491
Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 395 KB
Volume: 27
Category: Article
ISSN: 0021-9614
DOI: 10.1006/jcht.1995.0059

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✦ Synopsis

The standard molar enthalpies of formation at the temperature 298.15 K of {(CH3)2N}2PCN(l), (CH3)2NP(CN)2(l), and P(CN)3(cr) have been determined by reaction calorimetry as -(0.4 2 3.2) kJ•mol -1 , (189.3 2 5.0) kJ•mol -1 , and (373.1 2 6.8) kJ•mol -1 , respectively. Enthalpies of vaporization have been obtained from vapour-pressure measurements for the first two compounds and the corresponding values of DfH°m(g)/(kJ•mol -1 ) derived as (54.2 2 3.5), (228.7 2 5.5), and (448.4 2 7.4), respectively. The values of the bond enthalpies D(P-CN) in the cyanophosphines are discussed.

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