✦ LIBER ✦

Determination of the proton affinities of H2O and CS2 relative to C2H4

✍ Scribed by Bruce J. McIntosh; Nigel G. Adams; David Smith

Publisher: Elsevier Science
Year: 1988
Tongue: English
Weight: 627 KB
Volume: 148
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(88)80290-2

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✦ Synopsis

The forward and reverse rate coefficients for the proton transfer reactions C*H: +H20+C2H4tHrO+, C2H: +CS$C2H.,tCS2H+ and C&H++H,OXS,+H,O+ have been measured at 295 and 480 K and also at 210 K for the first of these reactions. Values of the enthalpy and entropy changes have been obtained from van 't Hoff plots. The entropy changes are found to be in excellent agreement with values calculated from ratios of rotational and translational partition functions. Using the proton affinity (PA) for C,H, of 162.6f0.5 kcal mol-' as a reference, we obtain PA(HrO)= 165.1 kO.7 and PA(C$)= 162.9kO.7 kcal mol-r.

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