The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform

He Tian - One of the best experts on this subject based on the ideXlab platform.

Naohiko Mikami - One of the best experts on this subject based on the ideXlab platform.

  • Infrared spectroscopy of OH stretching vibrations of Hydrogen‐Bonded tropolone‐(H2O)n (n=1–3) and tropolone‐(CH3OH)n (n=1 and 2) clusters
    The Journal of Chemical Physics, 1996
    Co-Authors: Akira Mitsuzuka, Asuka Fujii, Takayuki Ebata, Naohiko Mikami
    Abstract:

    Infrared spectra of jet‐cooled tropolone‐(H2O)n (n=1–3) and tropolone‐(CH3OH)n (n=1 and 2) clusters were observed in the OH stretching region by using infrared‐ultraviolet double resonance techniques. Size separated electronic spectra of these clusters were also observed with hole‐burning spectroscopy in which the infrared laser was used as hole light. Both the infrared and hole‐burning spectra of the tropolone‐methanol clusters were found to be quite similar to those of the corresponding tropolone‐water clusters, indicating that a similar structure is expected for both the clusters. Structure of the n=1 and 2 clusters of tropolone‐water and ‐methanol is discussed. The infrared (IR) spectra suggest that the intramolecular Hydrogen Bond of tropolone OH is not destroyed in tropolone‐(H2O)n (n≤2) and ‐CH3OH, while the Intermolecular Hydrogen Bond dominates in tropolone‐(H2O)3 and ‐(CH3OH)2. The transformation of the intramolecular to Intermolecular Hydrogen Bond induced by the solvation is also discussed.

  • infrared spectroscopy of oh stretching vibrations of Hydrogen Bonded tropolone h2o n n 1 3 and tropolone ch3oh n n 1 and 2 clusters
    Journal of Chemical Physics, 1996
    Co-Authors: Akira Mitsuzuka, Asuka Fujii, Takayuki Ebata, Naohiko Mikami
    Abstract:

    Infrared spectra of jet‐cooled tropolone‐(H2O)n (n=1–3) and tropolone‐(CH3OH)n (n=1 and 2) clusters were observed in the OH stretching region by using infrared‐ultraviolet double resonance techniques. Size separated electronic spectra of these clusters were also observed with hole‐burning spectroscopy in which the infrared laser was used as hole light. Both the infrared and hole‐burning spectra of the tropolone‐methanol clusters were found to be quite similar to those of the corresponding tropolone‐water clusters, indicating that a similar structure is expected for both the clusters. Structure of the n=1 and 2 clusters of tropolone‐water and ‐methanol is discussed. The infrared (IR) spectra suggest that the intramolecular Hydrogen Bond of tropolone OH is not destroyed in tropolone‐(H2O)n (n≤2) and ‐CH3OH, while the Intermolecular Hydrogen Bond dominates in tropolone‐(H2O)3 and ‐(CH3OH)2. The transformation of the intramolecular to Intermolecular Hydrogen Bond induced by the solvation is also discussed.

Tianshu Chu - One of the best experts on this subject based on the ideXlab platform.

Qiong Zhang - One of the best experts on this subject based on the ideXlab platform.

Tachau Chang - One of the best experts on this subject based on the ideXlab platform.

  • investigation of tautomeric structures of thionin by satellite holes matrix dependence
    Chemical Physics Letters, 1999
    Co-Authors: Kevin C Weng, Chienchih Chiang, Shaoying Cheng, Roman I Personov, Jiyen Cheng, Tachau Chang
    Abstract:

    Abstract We have applied the satellite hole spectroscopy to study the tautomeric structures of thionin dye in glycerol:water glass. Slightly different frequencies (∼15 cm −1 ) are observed for several satellite holes of thionin upon tuning the burning wavelength, implying that two conformational structures exist. However, only one set of satellite holes occurring in the spectrum of thionin doped in polyvinyl butyral film allows us to investigate the tautomeric structures of thionin in different matrices. Our results suggest that the appearance of two tautomeric structures of thionin in glycerol:water glass is due to the proton exchange between different sites of thionin and the matrix through Intermolecular Hydrogen Bond.

  • Satellite holes of dye molecules doped in polymer films: Intermolecular Hydrogen-Bond effect
    Chemical Physics Letters, 1995
    Co-Authors: Chienchih Chiang, Jiyen Cheng, Jiann-hua Wang, Tachau Chang
    Abstract:

    Abstract We have studied the nonphotochemical hole-burned spectra of dye molecules in polyvinyl alcohol films, where the dye molecule contains a BF 2 functional group. An intense satellite hole that possibly corresponds to B-F bending is observed. The excitation into the B-F vibronic transition makes the rearrangement of the configurations of the host more efficient via the Intermolecular Hydrogen Bond. In addition, temperature-annealing-cycling results show that the same magnitude of the electron-phonon coupling determines the electronic zero phonon hole (ZPH) and the vibronic satellite hole (SH), even in the presence of the Intermolecular Hydrogen Bond. The hole intensity ratio of the SH to the ZPH suggests that the lowest absorption band consists of at least two prominent absorption components.