Electronic spectrum and characterization of diabatic potential energy surfaces for thiophenol

Zhang, Linyao; Truhlar, Donald G.; Sun, Shaozeng

doi:10.1039/c8cp05215h

Title: Electronic spectrum and characterization of diabatic potential energy surfaces for thiophenol

Journal Article · Mon Oct 29 00:00:00 EDT 2018 · Physical Chemistry Chemical Physics. PCCP

DOI:https://doi.org/10.1039/c8cp05215h· OSTI ID:1611114

^[1];

^[2]; Sun, Shaozeng ^[3]

Harbin Institute of Technology (China); Univ. of Minnesota, Minneapolis, MN (United States)
Univ. of Minnesota, Minneapolis, MN (United States)
Harbin Institute of Technology (China)

The electronic spectrum of thiophenol was simulated by a normal-mode sampling approach combined with TDDFT in the Tamm–Dancoff approximation (TDA). The vertical excitation energies were compared with electronic structure calculations by completely renormalized equation-of-motion coupled cluster theory with single and double excitations and noniterative inclusion of connected triples (CR-EOM-CCSD(T)) and by multi-reference perturbation theory. The spectrum was computed both with and without solvation effects, and these spectra are compared to each other and to experiment. Using multireference-perturbation-theory adiabatic wave functions and model-space diabatization by the fourfold way, diabatic potential energy surfaces of the lowest three singlet states (¹ππ, ¹ππ^*, and ¹n_πσ^*) were constructed along the S–H stretching coordinate, the C–C–S–H torsion coordinate, and the v_16a and v_16b normal coordinates. The first two of these two are primary coordinates for the photodissociation, and the diabatic crossing seams of the three states were calculated and plotted as functions of the two coordinates. The other two coordinates are out-of-plane ring distortion modes studied to assess the extent of their role in coupling the states near the first conical intersection, and the v_16a mode was shown to be an important coupling mode there. The current study is the first step toward a detailed mechanistic analysis of the photoinduced S–H fission process of thiophenol, a test system to understand ¹n_πσ^*-mediated reactions, at the same time already providing a better understanding of the thiophenol electronic excitations by clarifying the assignment of the experimental results.

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Research Organization:: Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0008666; SC0015997

OSTI ID:: 1611114

Alternate ID(s):: OSTI ID: 1480554

Journal Information:: Physical Chemistry Chemical Physics. PCCP, Vol. 20, Issue 44; ISSN 1463-9076

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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