An interpretation of the structure of Langmuir-Blodgett films of octa-substituted metal-free phthalocyanine molecules from optical spectra

RAY, A. K., NABOK, A. V., HASSAN, A. K., OMAR, O., TAYLOR, R. E. and COOK, M. J. (1998). An interpretation of the structure of Langmuir-Blodgett films of octa-substituted metal-free phthalocyanine molecules from optical spectra. Philosophical magazine. B, Physics of condensed matter, electronic, optical, and magnetic properties, 78 (1), 53-64.

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Link to published version:: 10.1080/13642819808206726

Abstract

Ultraviolet-visible absorption spectra of Langmuir-Blodgett (LB) films of octa-substituted metal-free phthalocyanine molecules are decomposed into Gaussian-Lorentzian components in order to compare the in-plane molecular arrangements of the two groups of the compounds with short and long alkyl chains. LB films of long-chain molecules represent the Davydov splitting of the Q band, which corresponds to the 'herringbone' molecular structure and the angle between the molecules is estimated to be 75 degrees. For short-chain molecules, the largely broadened 'blue' component of the Davydov doublets is suppressed and this can be explained by the domination of an anisotropic stack-like molecular arrangement in LB films.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Electronic Materials and Sensors Research Group
Identification Number: 10.1080/13642819808206726
Depositing User: Ann Betterton
Date Deposited: 30 Mar 2010 17:37
Last Modified: 30 Mar 2010 17:37
URI: http://shura.shu.ac.uk/id/eprint/1446

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