Computational Evidence of Inversion of 1La and 1Lb-Derived Excited States in Naphthalene Excimer Formation from ab Initio Multireference Theory with Large Active Space: DMRG-CASPT2 Study

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• 作者：Soichi Shirai ; Yuki Kurashige ; Takeshi Yanai
• 刊名：Journal of Chemical Theory and Computation
• 出版年：2016
• 出版时间：May 10, 2016
• 年：2016
• 卷：12
• 期：5
• 页码：2366-2372
• 全文大小：412K
• 年卷期：0
• ISSN：1549-9626

文摘

The naphthalene molecule has two important lowest-lying singlet excited states, denoted ¹L_a and ¹L_b. Association of the excited and ground state monomers yields a metastable excited dimer (excimer), which emits characteristic fluorescence. Here, we report a first computational result based on ab initio theory to corroborate that the naphthalene excimer fluorescence is ¹L_a parentage, resulting from inversion of ¹L_a and ¹L_b-derived dimer states. This inversion was hypothesized by earlier experimental studies; however, it has not been confirmed rigorously. In this study, the advanced multireference (MR) theory based on the density matrix renormalization group that enables using unprecedented large-size active space for describing significant electron correlation effects is used to provide accurate potential energy curves (PECs) of the excited states. The results evidenced the inversion of the PECs and accurately predicted transition energies for excimer fluorescence and monomer absorption. Traditional MR calculations with smaller active spaces and single-reference theory calculations exhibit serious inconsistencies with experimental observations.