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NH2/ND2-vapour pressure isotope effect of cyclopropylamine |
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| Authors: | Hans Wolff |
| Institution: | Physikalisch-chemisches Institut, Universität Heidelberg, D-6900 Heidelberg, Federal Republic of Germany Department of Chemistry, University of Warsaw, Warsaw Poland |
| Abstract: | The NH2/ND2-vapour pressure isotope effect has been determined between 283 and 333 K for cyclopropylamine, an amine with a strong ring strain. The measurements are represented by the relation lnP(C3H5N2H2)/P(C3H5NH2)] = −(8821.73 ± 68.949) (K/T)2 + (23.379 ± 0.223)K/T and correspond to a normal (PD/PH < 1) effect. They suggest an association that is slightly weaker than that of propylamine and nearly agrees with that of isopropylamine. The differences are discussed in terms of acidities and steric factors. |
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