Abstract
We have investigated the through-bond exchange interactions in three non-Kekulé hydrocarbon diradicals on the basis of single- and multireference coupled cluster and related broken-symmetry (BS) methods. The singlet–triplet energy gap (S-T gap) and diradical characters for these species are evaluated. It is found that the spin contamination involved in the BS solutions is non-negligible and the approximate spin-projection method greatly improves the usual BS solutions. As for Mukherjee’s state-specific multireference coupled cluster (MkMRCC) computations, the size-consistent correction with the UHF localized natural orbitals (ULO) is useful to obtain the qualitatively correct 2J values.
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Acknowledgments
T. S. is grateful for the Research Fellowships from Japan Society for the Promotion of Science for Young Scientists (JSPS). This work has been supported by Grants-in-Aid for Scientific Research (KAKENHI) (Nos. 21550014, 19750046, 19350070) from JSPS and that on Grant-in-Aid for Scientific Research on Innovative Areas (“Coordination Programming” area 2170, No. 22108515) from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT).
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Dedicated to Professor Akira Imamura on the occasion of his 77th birthday and published as part of the Imamura Festschrift Issue.
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Appendix
Definitions of acronyms are given in Table 7.
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Saito, T., Nishihara, S., Yamanaka, S. et al. Singlet–triplet energy gap for trimethylenemethane, oxyallyl diradical, and related species: single- and multireference computational results. Theor Chem Acc 130, 739–748 (2011). https://doi.org/10.1007/s00214-011-0914-z
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DOI: https://doi.org/10.1007/s00214-011-0914-z