Ab Initio CASSCF Study on Doublet and Quartet States of l,3,5-Tris(methylene)benzene and 1,3,5-Benzenetriamine Trication

Akihiro Ito, Aya Taniguchi, Kazunari Yoshizawa, Kazuyoshi Tanaka, Tokio Yamabe

研究成果: ジャーナルへの寄稿記事

9 引用 (Scopus)

抄録

Ab Initio CASSCF results of l,3,5-tris(methylene)benzene (TMB) and 1,3,5-benzenetriamine trication (BTA3+), which are model molecules of the actively researched triradicals with star-branched topology, are presented. This study included a geometry determination of the four low-lying states (4A1″, 4A2, 2A2, 2B1) of TMB and BTA3+. The doublet-quartet splitting energies (ΔED-Q) of TMB and BTA3+ were calculated to be 12.7 and 3.1 kcal mol-1, respectively. Furthermore, the doublet-doublet splitting energies of TMB and BTA3+, which arise from a Jahn-Teller distortion of the doubly degenerate 2E" state, were suitably estimated to be 2.5 and 6.8 kcal mol-1, respectively, due to obviation of the spin-contamination problem. As a result of configuration mixing, it was found that the doublet states for TMB and BTA3+ have to be represented at least by two configurations or more. In addition, the doublet states of TMB were regarded as being a doublet triradical, while those of BTA3+ were close to a doublet monoradical; associated with this result, the lowest doublet states of TMB and BTA3+ were found to be 2A2 and 2B1, respectively.

元の言語英語
ページ(範囲)337-343
ページ数7
ジャーナルBulletin of the Chemical Society of Japan
71
発行部数2
DOI
出版物ステータス出版済み - 1 1 1998
外部発表Yes

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Jahn-Teller effect
Benzene
Stars
Contamination
Topology
Molecules
Geometry
1,3,5-benzenetriamine

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

これを引用

Ab Initio CASSCF Study on Doublet and Quartet States of l,3,5-Tris(methylene)benzene and 1,3,5-Benzenetriamine Trication. / Ito, Akihiro; Taniguchi, Aya; Yoshizawa, Kazunari; Tanaka, Kazuyoshi; Yamabe, Tokio.

:: Bulletin of the Chemical Society of Japan, 巻 71, 番号 2, 01.01.1998, p. 337-343.

研究成果: ジャーナルへの寄稿記事

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abstract = "Ab Initio CASSCF results of l,3,5-tris(methylene)benzene (TMB) and 1,3,5-benzenetriamine trication (BTA3+), which are model molecules of the actively researched triradicals with star-branched topology, are presented. This study included a geometry determination of the four low-lying states (4A1″, 4A2, 2A2, 2B1) of TMB and BTA3+. The doublet-quartet splitting energies (ΔED-Q) of TMB and BTA3+ were calculated to be 12.7 and 3.1 kcal mol-1, respectively. Furthermore, the doublet-doublet splitting energies of TMB and BTA3+, which arise from a Jahn-Teller distortion of the doubly degenerate 2E{"} state, were suitably estimated to be 2.5 and 6.8 kcal mol-1, respectively, due to obviation of the spin-contamination problem. As a result of configuration mixing, it was found that the doublet states for TMB and BTA3+ have to be represented at least by two configurations or more. In addition, the doublet states of TMB were regarded as being a doublet triradical, while those of BTA3+ were close to a doublet monoradical; associated with this result, the lowest doublet states of TMB and BTA3+ were found to be 2A2 and 2B1, respectively.",
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