Abstract
The empirical relation u(CC bond) = â0.071856 + 0.124162 r â 0.028974 r 2 was established from a statistical treatment of 57 electron diffraction measurements (1.2086 â©œ r â©œ 1.549, where r is the bond distance, and u is the mean amplitude of vibration; both in Ă units). The agreement between observed and calculated u values is significantly improved when compared with the corresponding treatment of bonded and non-bonded CC distances taken together.
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