Spectroscopic and X-ray diffraction study of Langmuir-Blodgett films of some 1,4,8,11,15,18-hexaalkyl-22,25-bis(carboxypropyl)phthalocyanines

Michael J. Cook*, Neil B. McKeown, John M. Simmons, Andrew J. Thomson, Mervyn F. Daniel, Kenneth J. Harrison, Robert M. Richardson, Stephen J. Roser

*Corresponding author for this work

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

69 Citations (Scopus)

Abstract

Molecular assemblies within Langmuir-Blodgett (LB) films of 1,4,8,11,15,18-hexaoctyl-22,25-bis(carboxypropyl)phthalocyanine (1a) copper 1,4,8,11,15,18-hexanonyl-22,25-bis(carboxypropyl)phthalocyaninate (1b) and 1,4,8,11,15,18-hexadecyl-22,25-bis(carboxypropyl)phthalocyanine (1c) have been examined using X-ray diffraction, RAIRS and polarised optical spectroscopy. The LB films are constructed as bilayers by Y-type deposition and the resulting assemblies give rise to visible-region absorption spectra closely similar to those of crystallised films of octaalkylphthalocyanines. When heated, the molecular assemblies within the LB films of 1a and 1b reorganise irreversibly to a form in which the bilayer spacing is reduced. The transition from one type of packing to another is sharp for the film of 1a but occurs over a wide temperature range for the film of 1b. Heating the film of 1c to 140°C modifies the packing but in this case a further modification occurs on cooling.

Original languageEnglish
Pages (from-to)121-127
Number of pages7
JournalJournal of Materials Chemistry
Volume1
Issue number1
DOIs
Publication statusPublished - 1 Dec 1991

Keywords

  • Langmuir-Blodgett film
  • Phthalocyanine

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