Fabrication of ordered Langmuir-Blodgett multilayers of octa-n-alkoxy phthalocyanines

M. J. Cook*, A. J. Dunn, M. F. Daniel, R. C.O. Hart, R. M. Richardson, S. J. Roser

*Corresponding author for this work

    Research output: Contribution to journalArticle (Academic Journal)peer-review

    74 Citations (Scopus)

    Abstract

    The monolayer and deposition behaviour was investigated for a series of eight 1, 4, 8, 11, 15, 18, 22, 25-octa-alkoxy phthalocyanines. Relative to their metal-free analogues, the copper octapropoxy, copper octabutoxy and copper octapentyloxy phthalocyanines gave larger values for the average area per molecule at a standard surface pressure, showed much reduced hysteresis in the π-A isotherm and exhibited greater monolayer stability. The best deposition onto hydrophilic glass was observed for compounds bearing octabutoxy and octapentyloxy chains. These gave even, green multilayer films by either Y- or Z-type deposition. Films of copper and zinc octapentyloxy phthalocyanines gave X-ray diffraction patterns consistent with domains of layer structuring. The layer thickness was 24 Å for the former and 26 Å for the latter. These values correspond well to the maximum molecular dimension obtained from space-filling models and suggest that, where layer structuring occurs, the molecules are arranged with their planes approximately orthogonal to the substrate surface. The photostability of two examples was investigated.

    Original languageEnglish
    Pages (from-to)395-404
    Number of pages10
    JournalThin Solid Films
    Volume159
    Issue number1-2
    DOIs
    Publication statusPublished - 1 Jan 1988

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