Spectral study on the molecular orientation of a tetracationic porphyrin dye on the surface of layered silicates |
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| Authors: | Alexander Čeklovský Juraj Bujdák Adriana Czímerová Nobuo Iyi |
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| Institution: | (1) Department of Hydrosilicates, Institute of Inorganic Chemistry, Slovak Academy of Sciences, 842 36 Bratislava, Slovakia;(2) National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan |
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| Abstract: | Tetracationic porphyrin dyes TMPyP and ZnPyP were intercalated into hydrophobized layered silicate films of three smectites.
The smectites represented the layered silicate specimens of high (Fluorohectorite, Corning; FHT), medium (Kunipia F montmorillonite;
KF) and low layer charge (Laponite, Laporte; LAP). The molecular orientations of the dye cations were studied by means of
linearly-polarized ultraviolet-visible (UV-VIS) spectroscopy. The spectral analysis and consequent calculations of tilting
angles of the transition moments at the wavelengths of Soret band transitions were in the range of 25°-35°. The determined
angles indicated molecular orientation of the dye cations being almost parallel to the surface of the silicates. Slightly
higher values (above 35°), determined for a FHT film, indicated either a slightly tilted orientation of the dye cations or
the change of molecular comformation after the intercalation of the dye.
Presented at 5-th International Conference Solid State Surfaces and Interfaces, November 19–24, 2006, Smolenice Castle, Slovakia |
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| Keywords: | Dichroism linearly polarized spectroscopy molecular orientation porphyrin dye smectite |
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