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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/24928


    Title: DFT-PCM studies of the solvent effects on the absorption properties of DCM
    Authors: 王伯昌;Wang, Bo-cheng
    Contributors: 淡江大學化學學系
    Keywords: DCM;DFT;DFT-PCM;TD-DFT;maximum absorption wavelength
    Date: 2006-12-01
    Issue Date: 2009-12-01
    Publisher: World Scientific Publishing
    Abstract: In this paper, we have performed the optimized structures of the red emitting material, 4-(dicyanomethylene)-2-methyl-6-[p-(dimethyl amino) styryl]-4H-pyran (DCM), with different polarity solvent environments by using the density functional theory (DFT) method, B3LYP/6-31G*. The time-dependent density functional theory (TD-DFT) and the polarizable continuum model (PCM) have been used to obtain the optical properties in the solvent environment. It has been observed that when the solvent polarity increases, the DCM molecule exhibits the red shift in the maximum absorption wavelength and enhances the oscillator strength (f). The solvent polarity also enhances the electron transfer ability from the electron-donating dimethylamine group (-N(CH3)2) to the electron-withdrawing =C(CN)2 group. The S0 → S1 transition of DCM is found to be π–π*. The maximum absorption wavelengths of different solvent environments are found to be consistent with the reported experimental results.
    Relation: Journal of Theoretical and Computational Chemistry 5(4), pp.957-965
    DOI: 10.1142/S0219633606002672
    Appears in Collections:[Graduate Institute & Department of Chemistry] Journal Article

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