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Interchain interactions in conjugated materials: The exciton model versus the supermolecular approach

J. Chem. Phys. 112, 4749 (2000); doi:10.1063/1.481031

Issue Date: 8 March 2000

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D. Beljonne and J. Cornil
Laboratory for Chemistry of Novel Materials, Center for Research in Molecular Electronics and Photonics, University of Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium

R. Silbey
Center for Materials Science and Engineering, Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

P. Millié
CEA/Saclay, DRECAM, 91191 Gif-Sur-Yvette, France

J. L. Brédas
Laboratory for Chemistry of Novel Materials, Center for Research in Molecular Electronics and Photonics, University of Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium
Department of Chemistry, The University of Arizona, Tucson, Arizona 85721-0041
Correlated quantum-chemical techniques are applied to the description of electronic excitations in interacting conjugated chains. The focus is on the magnitude and conjugation-length dependence of the splitting of the lowest optically allowed excitonic state, which is induced by interchain interactions. We first examine cofacial dimers formed by linear polyene chains of various lengths and use two strategies to compute the exciton coupling energy. One is based on molecular exciton theory, which assumes that the excited-state wave functions of the isolated chains remain unperturbed by the intermolecular forces; in the other, the supermolecular approach, the wave functions are obtained from molecular orbital calculations performed for the whole system and are therefore not constrained to a single chain. We find that the two techniques lead to consistent results, provided an appropriate form for the interchain Coulomb interactions is adopted in the excitonic model. In particular, both formalisms indicate a peak behavior for the evolution of the exciton splitting energy with the length of the interacting conjugated chains. As an illustration, the chain-length dependence of the Davydov splitting is evaluated in the case of oligothiophenes on the basis of the experimental x-ray crystal structures; the results are compared to recent polarized absorption data. ©2000 American Institute of Physics.
History: Received 29 September 1999; accepted 14 December 1999
Permalink: http://link.aip.org/link/?JCPSA6/112/4749/1
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KEYWORDS and PACS

Keywords
PACS
  • 71.15.Fv
    Electronic structure Methods of electronic structure calculations Atomic- and molecular-orbital methods (including tight binding approximation, valence-band method, etc.)
  • 71.35.-y
    Electronic structure Excitons and related phenomena
  • YEAR: 2000

PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
AIP is a member of CrossRef AIP

REFERENCES (35)
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