Ionization of normal alkanes: enthalpy, entropy, structural and isotope effects

M Meot-Ner, LW Sieck, P Ausloos

Index: Meot-Ner (Mautner), M.; Sieck, L.W.; Ausloos, P. Journal of the American Chemical Society, 1981 , vol. 103, # 18 p. 5342 - 5348

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Citation Number: 37

Abstract

Abstract: Enthalpies and entropies of ionization (AH?, Sio) of C4 to Cll normal alkanes were determined from charge-transfer equilibrium measurements between 300 and 420 K by using photoionization high-pressure mass spectrometry. Large negative ASi'values are observed in C7 and larger n-alkanes, from-4.7 cal mol-'KI (-19.6 J mol-'KI) in heptane to-13.9 cal mol-'Kl (-58.1 J mol-'KI) in undecane; in contrast, ASi'of C& n-alkanes is negligible. Mio ...