The Deposition and Characterization of Langmuir-Blogett Films of Mono-crown Ether Substituted Unsymmetrical Phthalocyanines

Abstract

Abstract: The mono-layers and Langmuir-Blogget films forming properties of three novel unsymmetrical phthalocyanines bearing one crown ether ring and three alkoxyl chains have been studied. Inspection of the π-A isotherms indicates that they form stable and well distributed mono-layers on water subphase. The mono-layers can be transferred to CaF₂ substrates. UV-Vis spectroscopic studies show that the absorbance varies linearly with the number of layers. Compounds a and b gave rise to Ytype deposition while compound c deposited in Ytype over the first few dipping cycles with subsequent Z-type deposition on the following cycles. The molecular packing of the films has been probed by polarized UV-Vis spectroscopy and low-angle X-ray diffraction methods. The results show that the phthalocyanine macrorings of compounds a, b and c inclined to the substrates' surface with an angle of 39°, 57° and 47°, respectively. The thickness of the corresponding films was estimated to be 1.9, 2.2 and 2.9 nm, respectively.

Key words: Unsymmetrical phthalocyanine, Crown ether, LB film

CLC Number:

O647.1

TrendMD:

LI Xi-You, XU Hui-Jun . The Deposition and Characterization of Langmuir-Blogett Films of Mono-crown Ether Substituted Unsymmetrical Phthalocyanines[J]. Chem. J. Chinese Universities, 1998, 19(6): 967.

References

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