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The enthalpies of formation of (dimethylamino)dichlorophosphine, bis(dimethylamino)chlorophosphine, and tris(dimethylamino)phosphine

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

Book ID
102573465
Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
330 KB
Volume
27
Category
Article
ISSN
0021-9614

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✦ Synopsis

The standard molar enthalpies of formation at the temperature 298.15 K of (CH3)2NPCl2(l), {(CH3)2N}2PCl(l), and {(CH3)2N}3P(l) have been determined by reaction calorimetry as -(286.3 2 2.4) kJ•mol -1 , -(220.1 2 2.3) kJ•mol -1 , and -(112.8 2 2.3) kJ•mol -1 , respectively. Enthalpies of vaporization have been obtained from vapour-pressure measurements and the corresponding values of DfH°m(g) derived as -(245.5 2 2.5) kJ•mol -1 , -(174.2 2 2.6) kJ•mol -1 , and -(71.3 2 2.4) kJ•mol -1 , respectively. The values of the bond enthalpies D(P-Cl) and D(P-N) in substituted phosphines are discussed. † Throughout this paper uncertainty intervals of reported experimental results denote 95 per cent confidence limits, calculated using Student's t at the appropriate number of degrees of freedom.

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The enthalpies of formation of bis(dimet
The enthalpies of formation of bis(dimethylamino)cyanophosphine, (dimethylamino)dicyanophosphine, and tricyanophosphine
✍ H.M.A. Al-Maydama; Arthur Finch; P.J. Gardner; A.J. Head 📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 395 KB

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