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First principle calculations of dipole-dipole dispersion coefficients for the ground and first π → π∗ excited states of some azabenzenes
Linköping University, Sweden.ORCID iD: 0000-0002-1191-4954
2004 (English)In: Journal of Computational Methods in Sciences and Engineering, ISSN 1472-7978, E-ISSN 1875-8983, Vol. 4, no 3, 321-332 p.Article in journal (Refereed) Published
Abstract [en]

The complex polarization propagator method has been applied to the calculation of dipole-dipole dispersion coefficients (also known as C6 coefficients) of pyridine, pyrazine, and s-tetrazine. These calculations refer to the electronic ground states as well as the first excited states of π → π∗ character. It is argued that accurate ground state dispersion coefficients are obtained with density functional theory using the B3LYP exchange-correlation functional. The proposed values for the C6 coefficients of pyridine, pyrazine, and s-tetrazine in their ground states are 1543 a.u., 1398 a.u., and 1014 a.u., respectively. Multi-configurational complete active space calculations are performed on these compounds in their respective π → π∗ excited state. The isotropic averages of the frequency-dependent polarizabilities are smaller in the excited states, but the effective frequencies-defined in the London-van der Waals dispersion relation-are on the other hand larger.

Place, publisher, year, edition, pages
IOS Press, 2004. Vol. 4, no 3, 321-332 p.
Keyword [en]
Density functional theory, Dispersions, Ground state, Pyridine, Van der Waals forces, Complete active space, Complex polarization propagator, Dispersion coefficient, Dispersion relations, Electronic ground state, Exchange-correlation functionals, First principle calculations, Frequency-dependent polarizabilities, Excited states
National Category
Theoretical Chemistry
URN: urn:nbn:se:kth:diva-198799ScopusID: 2-s2.0-26044476395OAI: diva2:1058927

QC 20161222

Available from: 2016-12-21 Created: 2016-12-21 Last updated: 2016-12-22Bibliographically approved

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Norman, Patrick
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