Abstract
State-average complete active space self-consistent field (SA-CASSCF) calculations are performed on the energetically lowest two electronic states of a novel alkyl-substituted 4-quinopyran twisted π-system electrooptic chromophore. In the gas phase, the ground-state electronic configuration is diradicaloid (D), and the first excited state is zwitterionic (Z). When an external dipolar field is applied to simulate polar solvation, the relative energies of D and Z are dramatically perturbed. At sufficient field strengths, the relative ordering of the states is inverted so that Z becomes the ground state. As the energy difference between the D and Z states falls, the magnitudes of the longitudinal static polarizability (α) and hyperpolarizability (β) increase appreciably-in certain cases, by 2 orders of magnitude. These computational results are interpreted and supported by qualitative state correlation diagrams constructed from qualitative molecular orbital theory and are in agreement with recent experimental results on twisted π-system electro-optic chromophores (Kang, H. et al. J. Am. Chem. Soc. 2007, 129, 3267). The computational results also suggest that changing the environmental polarity is a promising strategy for tuning α and β in such types of chromophores, which experimentally exhibit large nonlinear optical response.
| Original language | English |
|---|---|
| Pages (from-to) | 44-50 |
| Number of pages | 7 |
| Journal | Journal of Physical Chemistry B |
| Volume | 112 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jan 10 2008 |
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ASJC Scopus subject areas
- Physical and Theoretical Chemistry
Cite this
Nonlinear response properties of ultralarge hyperpolarizability twisted π-system donor-acceptor chromophores. Dramatic environmental effects on response. / Brown, Eric C.; Marks, Tobin J; Ratner, Mark A.
In: Journal of Physical Chemistry B, Vol. 112, No. 1, 10.01.2008, p. 44-50.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Nonlinear response properties of ultralarge hyperpolarizability twisted π-system donor-acceptor chromophores. Dramatic environmental effects on response
AU - Brown, Eric C.
AU - Marks, Tobin J
AU - Ratner, Mark A
PY - 2008/1/10
Y1 - 2008/1/10
N2 - State-average complete active space self-consistent field (SA-CASSCF) calculations are performed on the energetically lowest two electronic states of a novel alkyl-substituted 4-quinopyran twisted π-system electrooptic chromophore. In the gas phase, the ground-state electronic configuration is diradicaloid (D), and the first excited state is zwitterionic (Z). When an external dipolar field is applied to simulate polar solvation, the relative energies of D and Z are dramatically perturbed. At sufficient field strengths, the relative ordering of the states is inverted so that Z becomes the ground state. As the energy difference between the D and Z states falls, the magnitudes of the longitudinal static polarizability (α) and hyperpolarizability (β) increase appreciably-in certain cases, by 2 orders of magnitude. These computational results are interpreted and supported by qualitative state correlation diagrams constructed from qualitative molecular orbital theory and are in agreement with recent experimental results on twisted π-system electro-optic chromophores (Kang, H. et al. J. Am. Chem. Soc. 2007, 129, 3267). The computational results also suggest that changing the environmental polarity is a promising strategy for tuning α and β in such types of chromophores, which experimentally exhibit large nonlinear optical response.
AB - State-average complete active space self-consistent field (SA-CASSCF) calculations are performed on the energetically lowest two electronic states of a novel alkyl-substituted 4-quinopyran twisted π-system electrooptic chromophore. In the gas phase, the ground-state electronic configuration is diradicaloid (D), and the first excited state is zwitterionic (Z). When an external dipolar field is applied to simulate polar solvation, the relative energies of D and Z are dramatically perturbed. At sufficient field strengths, the relative ordering of the states is inverted so that Z becomes the ground state. As the energy difference between the D and Z states falls, the magnitudes of the longitudinal static polarizability (α) and hyperpolarizability (β) increase appreciably-in certain cases, by 2 orders of magnitude. These computational results are interpreted and supported by qualitative state correlation diagrams constructed from qualitative molecular orbital theory and are in agreement with recent experimental results on twisted π-system electro-optic chromophores (Kang, H. et al. J. Am. Chem. Soc. 2007, 129, 3267). The computational results also suggest that changing the environmental polarity is a promising strategy for tuning α and β in such types of chromophores, which experimentally exhibit large nonlinear optical response.
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UR - http://www.scopus.com/inward/citedby.url?scp=38649111613&partnerID=8YFLogxK
U2 - 10.1021/jp072481f
DO - 10.1021/jp072481f
M3 - Article
C2 - 18067278
AN - SCOPUS:38649111613
VL - 112
SP - 44
EP - 50
JO - Journal of Physical Chemistry B Materials
JF - Journal of Physical Chemistry B Materials
SN - 1520-6106
IS - 1
ER -