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Efficient Vibrational Energy Transfer through Covalent Bond in Indigo Carmine Revealed by Nonlinear IR Spectroscopy
He, Xuemei1,2; Yu, Pengyun1,2; Zhao, Juan1,2; Wang, Jianping1,2
2017-10-12
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY B
Volume121Issue:40Pages:9411-9421
AbstractUltrafast vibrational relaxation and structural dynamics of indigo carmine in dimethyl sulfoxide were examined using femtosecond pump-probe infrared and two-dimensional infrared (2D IR) spectroscopics. Using the intramolecularly hydrogen-bonded C=O and delocalized C=C stretching modes as infrared probes, local structural and dynamical variations of this blue dye molecule were observed. Energy relaxation of the vibrationally excited C=O stretching mode was found to occur through covalent bond to the delocalized aromatic vibrational modes On the time scale of a few picoseconds or less. Vibrational quantum beating was observed in magic-angle pump-probe, anisotropy, and 2D IR cross-peak dynamics, showing an oscillation period of ca. 1010 fs, which corresponds to the energy difference between the C=O and C=C transition frequency (33 cm(-1)). This confirms a resonant vibrational energy transfer happened between the two vibrators. However, a more efficient energy-accepting mode of the excited C=O stretching was believed to be a nearby combination and/or overtone mode that is more tightly connected to the C=O species. On the structural aspect, dynamical-time-dependent 2D IR spectra reveal an insignificant inhomogeneous contribution to time-correlation relaxation for both the C=O and C=C stretching modes, which is in agreement with the generally believed structural rigidity of such conjugated molecules.
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/41289
Collection分子反应动力学实验室
Affiliation1.Chinese Acad Sci, Inst Chem, CAS Res Educ Ctr Excellence Mol Sci, Beijing Natl Lab Mol Sci,Mol React Dynam Lab, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
He, Xuemei,Yu, Pengyun,Zhao, Juan,et al. Efficient Vibrational Energy Transfer through Covalent Bond in Indigo Carmine Revealed by Nonlinear IR Spectroscopy[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2017,121(40):9411-9421.
APA He, Xuemei,Yu, Pengyun,Zhao, Juan,&Wang, Jianping.(2017).Efficient Vibrational Energy Transfer through Covalent Bond in Indigo Carmine Revealed by Nonlinear IR Spectroscopy.JOURNAL OF PHYSICAL CHEMISTRY B,121(40),9411-9421.
MLA He, Xuemei,et al."Efficient Vibrational Energy Transfer through Covalent Bond in Indigo Carmine Revealed by Nonlinear IR Spectroscopy".JOURNAL OF PHYSICAL CHEMISTRY B 121.40(2017):9411-9421.
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