Journal
CHEMPHYSCHEM
Volume 14, Issue 11, Pages 2450-2461Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201300256
Keywords
charge transfer; chromophores; density functional calculations; donor-acceptor systems; nonlinear optics
Funding
- China Scholarship Council
- National Science Foundation [CHE-0952253]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0952253] Funding Source: National Science Foundation
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Nonempirically tuned hybrid density functionals with rangeseparated exchange are applied to calculations of the first hyperpolarizability (b k) and charge-transfer (CT) excitations of linear push-pull donor-acceptor-substituted organic molecules with extended p-conjugated bridges. An unphysical delocalization with increasing chain length in density functional calculations can be reduced significantly by enforcing an asymptotically correct exchange-correlation potential adjusted to give frontier orbital energies representing ionization poten-tials. The delocalization error for a number of donor-acceptor systems is quantified by calculations with fractional electron numbers and from orbital localizations. Optimally tuned hybrid variants of the PBE functional incorporating range-separated exchange can produce similar magnitudes for b k as MollerPlesset second-order perturbation (MP2) correlated calculations. Improvements are also found for CT excitation energies, with results similar to an approximate coupled-cluster model (CC2).
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