Solid-state thermochromism studied by variable-temperature diffuse reflectance spectroscopy. A new perspective on the chromism of salicylideneanilines
Article Abstract:
A successful application of variable-temperature diffuse reflectance spectroscopy is reported for the study of the solid-state thermo- and photochromism of salicylideneanilines that belong to a class of the most well-know chromic organic compounds. It is demonstrated that the color of the materials is controlled by a trace of colored species and that the variable-temperature diffuse reflectance spectroscopy is quite an effective tool for its detention and therefore the study of the chromism in the solid state.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2004
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Direct observation of surface ethyl to ethane interconversion upon C(sub 2)H(sub 4) hydrogenation over Pt/Al(sub 2)O(sub 3) catalyst by time resolved FT-IR spectroscopy
Article Abstract:
Time-resolved FT-IR spectra of ethylene hydrogenation over alumina-supported Pt catalyst are recorded at 25 ms resolution in the temperature range of 323-473 K using various H(sub 2) concentrations (1 atm total gas pressure). It is observed that a fraction (twenty five percent) of the asymptotic ethane growth at 323 K is prompt, which indicates that there are surface ethyl species that react much faster than the majority of the CH(sub 3)CH(sub 2)Pt intermediates.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2005
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Lennard-Jones model of frequency-selective barochromism and thermochromism of spectral holes in glasses
Article Abstract:
Pressure and temperature effects on (quasi) homogenous optical spectra of dyes in solvent glasses and polymers were investigated by hole burning. The relevance of the Lennard-Jones model approach, with respect to temperature and pressure broadening and linear electron-phonon coupling is discussed in short.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2004
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