Citation: XU Zong-Ping, ZHAO Yan-Ying, WANG Hui-Gang, ZHENG Xu-Ming. Resonance Raman Spectroscopy and Density Functional Theory Investigations on the Excited State Structural Dynamics of N-Methylpyrrole-2-carboxaldehyde and Its Solvent Effect[J]. Acta Physico-Chimica Sinica, ;2012, 28(01): 65-72. doi: 10.3866/PKU.WHXB20122865
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Resonance Raman spectra of N-Methylpyrrole-2-carboxaldehyde (NMPCA) were obtained and seven excitations covered the A- and B-band electronic absorptions. The electronic excitations and the Franck-Condon region structural dynamics of NMPCA were studied by resonance Raman spectroscopy and time-dependent density functional theory (TD-DFT) calculations. The A- and B-band electronic absorptions were assigned to π →π* transitions on the basis of the TD-B3LYP/6-311 ++ G(d,p) level of theory. The resonance Raman spectra showed Raman intensity in the fundamentals, the overtones and the combination bands for about 11-13 vibrational modes (A-band excitation) or 7-11 vibrational modes (B-band excitation). These were predominately due to the C=O stretch mode ν7, the ring deformation+N1- C6 stretch ν17, the ring deformation mode ν21 and the C6-N1-C2/C2-C3-C4 anti-symmetry stretch mode ν14. This indicates that the Franck-Condon region Sπ structural dynamics of NMPCA mainly occurs along the C=O stretch, the ring deformation, and the N1-C6 stretch reaction coordinates. In a certain solvent and under different excitation wavelengths the relative intensity of the C=O stretch mode ν7 versus the C6-N1-C2/C2-C3 -C4 anti-symmetry stretch mode ν14 shows an intense to weak to intense change as the excitation wavelengths decrease. This intensity variation directly reflects the Sn/Sπ state-mixing or crossing of the potential energy surfaces in the Franck-Condon region. Solvents can efficiently tune the Franck- Condon region Sn/Sπ state-mixing or crossing processes.
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