Abstract
The complete vibrational spectra of crystalline C6H6 and C6D6 have been calculated using semiempirical atom-atom potential functions. The calculation uses a free molecule normal coordinate basis including Eckart mass-weighted coordinates. The following factors affecting the calculated freuqencies have been investigated in some detail: (i) intermode mixing among internal vibrations and between internal and external modes, (ii) inclusion of the first derivative of the atom-atom potential with respect to interatomic distances, (iii) number of atom-atom interactions, (iv) fulfillment of equilibrium conditions, and temperature effects. The Jacobian of the crystal frequencies, equilibrium conditions, and heat of sublimation with respect to the individual atom-atom parameters have been evaluated and a refinement of the potential parameters is presented. The agreement between the calculated frequencies and available experimental data is satisfactory specially for lattice frequencies. Transition dipole-dipole calculations lead to poor agreement with observed frequencies thus showing the model to be inappropriate for crystalline benzene.
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Dates
Type | When |
---|---|
Created | 21 years, 7 months ago (Feb. 4, 2004, 5:30 p.m.) |
Deposited | 1 year, 6 months ago (Feb. 9, 2024, 6:09 a.m.) |
Indexed | 2 months, 1 week ago (June 27, 2025, 3:28 a.m.) |
Issued | 52 years, 7 months ago (Feb. 1, 1973) |
Published | 52 years, 7 months ago (Feb. 1, 1973) |
Published Print | 52 years, 7 months ago (Feb. 1, 1973) |
@article{Taddei_1973, title={Calculation of crystal vibrations of benzene}, volume={58}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.1679353}, DOI={10.1063/1.1679353}, number={3}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Taddei, G. and Bonadeo, H. and Marzocchi, M. P. and Califano, S.}, year={1973}, month=feb, pages={966–978} }