Theoretical investigation of the lowest singlet and triplet states in poly(paraphenylene vinylene)oligomers
J. Chem. Phys. 102, 2042 (1995); doi:10.1063/1.468726
Issue Date: 1 February 1995
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Using the semiempirical intermediate neglect of differential overlap (INDO) Hamiltonian in combination with configuration interaction techniques, we calculate the optical and photoinduced absorption spectra of poly(paraphenylene vinylene) oligomers containing from two to five phenyl rings; the evolutions with chain length of the singlet–singlet and triplet–triplet excitation energies as well as the values extrapolated for the polymer are in good agreement with experiment. The geometry relaxation phenomena in the first one-photon allowed singlet excited state and in the lowest triplet state are modeled on the basis of either bond-order/bond-length relationships or the formation of (bi)polaron-type defects; the results are compared to those of direct geometry optimizations in the excited state. The different methods consistently lead to more pronounced bond-length modifications in the triplet state than in the singlet state. ©1995 American Institute of Physics.
| History: | Received 6 July 1994; accepted 27 October 1994 |
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KEYWORDS and PACS
TRIPLETS,
OLIGOMERS,
POLYMERS,
PHENYLENE RADICALS,
INDO CALCULATIONS,
CONFIGURATION INTERACTION,
HAMILTONIANS,
ABSORPTION SPECTRA,
CHAINS,
LENGTH,
EXTRAPOLATION,
RELAXATION,
BOND LENGTHS,
MODIFICATIONS,
POLARONS,
OPTIMIZATION,
EXCITED STATES
- 31.15.Ct
Electronic structure of atoms, molecules and their ions: theory Calculations and mathematical techniques in atomic and molecular physics (excluding electron correlation calculations) Semi-empirical and empirical calculations (differential overlap, Hückel, PPP methods, etc.) - YEAR: 1995
RELATED DATABASES
PUBLICATION DATA
0021-9606 (print)
1089-7690 (online)
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