Abstract
Density functional theory calculations at PBE38/6-311+G** level by involving the polarizable continuum model in solvent dichloromethane were employed to explore the geometries, electronic excitations and associated properties of the donor–acceptor-donor (D–A–D) di-triphenylaniline-modified thiophenes of 4,4′-(thiophene-2,5-diyl)bis(N,N-diphenylaniline) (TPA–Th–TPA), 4,4′-([2,2′-bithiophene]-5,5′-diyl)bis(N,N-diphenylaniline) (TPA–ThTh–TPA) and 4,4′-(thieno[3,2-b]thiophene-2,5-diyl)bis(N,N-diphenylaniline) (TPA–TT–TPA). The spectral properties were investigated with the time-dependent density functional theory at the same theoretical level, involving 37.5% of the Hartree–Fock exchange energies and 50% of the local and non-local contributions, respectively, for the rest of the energies. It was found that the most stable TPA–Th–TPA has no symmetry (C1 point group) in the 1A electronic state, while the most stable structures for both TPA–ThTh–TPA and TPA–TT–TPA have C2 symmetry in the 1A state. Their vertical absorption spectra were examined with the twenty lowest excitations, while the emission spectra were equivalently simulated by the vertical transition (from S1 to S0) of the structure of the S1 state. Both the theoretical absorption and emission spectra agree very well with the experiments in terms of absolute wavelengths and their sequence for different compounds. For the absorption with the maximum wavelength and strength, the theoretical wavelengths reproduced the experiments with deviations of only 4.4, 0.6 and 7.3 nm for TPA–Th–TPA, TPA–ThTh–TPA and TPA–TT–TPA, respectively. While the emission peaks have slightly larger deviations by 44.5, 90.5 and 53.3 nm. Detailed features for the next intense peak, as well as their peak shoulders, were explored. For the electronic properties associated with the S0 → S1 transition, the hole-electron, frontier orbital and natural transition orbital analyses supported charge transfer characteristics. The inter-segment charge transfer analyses provided the magnitude of inter-segment charge transfer of TPA–Th–TPA, TPA–ThTh–TPA and TPA–TT–TPA by 67.1, 60.6 and 66.4%, respectively, within which the transfer from donors to acceptor(s) is dominant. In addition to the largest π conjugation of the ThTh group that leads to the largest redshift of the spectra and charge redistribution, TPA–ThTh–TPA has the largest vertical electron affinity energy, electronegativity and global electrophilicity with 2.01, 3.68 and 4.05 eV, respectively. All the molecules have electrostatic potentials in their S0 and S1 states by approximately 54% in the negative potential region, supplied mainly by the lone pair electrons of the S and N atoms as well as the π electrons of the C atoms. This leads to the compounds being more susceptible to electrophilic reactions. Similar atomic natural charge distributions for the different compounds in their S0 and S1 states were found, with the S atom(s) having the most positive charge (~ 0.42 e) and the N atoms having the most negative charge (~ − 0.51 e). Small changes in the atomic charge were found in the excitations, indicating that the charge transfer does not significantly change the atomic charge distributions.
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Acknowledgements
Part of the computations was performed in the High-Performance Computation Center of the Northwestern Polytechnical University. Support by the National Natural Science Foundation of China (No. 51761135032) is greatly acknowledged.
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This work was supported by the National Natural Science Foundation of China (No. 51761135032).
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HX did the experiments, performed the theoretical calculations and prepared the initial manuscripts. BX prepared the figures. SZ instructed the experiments. KS layout the research methods and revised the main manuscript. All authors reviewed the manuscript.
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Xing, H., Xue, B., Zhu, S. et al. Insights into the spectral property and electronic structure of di-triphenylaniline-modified monothiophene, dithiophene and thienothiophene. Theor Chem Acc 142, 84 (2023). https://doi.org/10.1007/s00214-023-03028-2
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DOI: https://doi.org/10.1007/s00214-023-03028-2