Characteristics of excimer formation in langmuir-blodgett assemblies of 1-palmitoyl-2-pyrenedecanoylphosphatidylcholine and dipalmitoylphosphatidylcholine
✍ Scribed by Paavo K.J. Kinnunen; Antti-Pekka Tulkki; Helge Lemmetyinen; Juha Paakkola; Jorma A. Virtanen
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- English
- Weight
- 603 KB
- Volume
- 136
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Langmuir-Blodgett film alloys of PPDPC (1-palmitoyl-2-t lO-(pyren-l-yl)]decanoyl-sn-glycer~3-phosphocholine) and DPPC (1,2dipalmitoyl-sn-glycero-3-phosphatidylchohne) were assembled in varying molar proportions on quartz glass slides. The transferred layers were then characterized according to their pyrene excimer to monomer fluorescence intensity ratio Z,lr, and fluorescence quantum yields as a function of film composition. The observed deviation from non-ideal mixing is considered to be due to the formation of regular distribution patterns of PPDPC in a DPPC lattice. The observed critical mole fractions of PPDPC evident as steps in Za/ZM versus X PPDPC plots can be accounted for by a model involving a trigonal distribution of pyrenedecanoyl chains in the phospholipid acyl chain lattice. The implications of the distribution of PPDPC as superlattices to the excimer formation mechanism are discussed.