Title: Linear polarizabilities and second hyperpolarizabilities of streptocyanines: Results from broken-Symmetry DFT and new CCSD(T) benchmarks

Journal Article · · Journal of Computational Chemistry
DOI: https://doi.org/10.1002/jcc.25519 · OSTI ID:1612454
 [1];  [2]; ORCiD logo [2]
  1. Univ. of California, Riverside, CA (United States); DOE/OSTI
  2. Univ. of California, Riverside, CA (United States)

In this work, we present a detailed analysis of the linear polarizability (α) and second hyperpolarizability (γ) in a series of streptocyanines, as predicted with various range-separated functionals and CCSD(T)-based methods. Contrary to previous work on these systems, we find that the lowest-energy electronic states for the larger streptocyanine oligomers are not closed-shell singlets, and improved accuracy can be obtained with certain DFT methods by allowing the system to relax to a lower-energy broken-symmetry solution. Our extensive analyses are complemented by new large-scale CCSD(T) and explicitly correlated CCSD(T)-F12 calculations that comprise the most complete and accurate benchmarks of α and γ for the streptocyanine systems to date. Taken together, our CCSD(T) and broken-symmetry DFT calculations (1) show that the MP2 benchmarks used in previous studies still exhibit significant errors (~ 25% for α and ~100% for γ) and, therefore, the MP2 calculations should not be used as reliable benchmarks for polarizabilities or hyperpolarizabilities, and (2) emphasize the importance of testing for a lower-energy open-shell configuration when calculating nonlinear optical properties for these systems. © 2018 Wiley Periodicals, Inc.

Research Organization:
Univ. of California, Riverside, CA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
SC0016269
OSTI ID:
1612454
Journal Information:
Journal of Computational Chemistry, Journal Name: Journal of Computational Chemistry Journal Issue: 28 Vol. 39; ISSN 0192-8651
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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