Intramolecular excimer fluorescence kinetics of 1,2-bis(4-pyrenylbutanoyl)phosphatidylcholine as a probe of molecular organization in spread monolayers at the nitrogen-water interface

Intramolecular excimer kinetics in a lipid containing two pyrene moieties, 1,2-bis(4-pyrenylbutanoyl)-phosphatidylcholine, have been examined by steady-state and time-resolved fluorescence in spread monolayers of several lipids to determine the effects of molecular organization on lipid dynamics. It...

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Bibliographic Details
Published in:Langmuir 1993-08, Vol.9 (8), p.2097-2101
Main Authors: Bohorquez, Maria, Patterson, L. K
Format: Article
Language:English
Subjects:
400201 - Chemical & Physicochemical Properties
550200 - Biochemistry
AROMATICS
BASIC BIOLOGICAL SCIENCES
Chemistry
CONDENSED AROMATICS
ELEMENTS
EMISSION SPECTROSCOPY
ENERGY LEVELS
Exact sciences and technology
EXCITED STATES
FLUORESCENCE SPECTROSCOPY
Gas-liquid interface and liquid-liquid interface
General and physical chemistry
HYDROCARBONS
HYDROGEN COMPOUNDS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
INTERFACES
KINETICS
LIPIDS
MEMBRANES
MOLECULAR STRUCTURE
NITROGEN
NONMETALS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PYRENE
SPECTROSCOPY
Surface physical chemistry
WATER
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Summary:Intramolecular excimer kinetics in a lipid containing two pyrene moieties, 1,2-bis(4-pyrenylbutanoyl)-phosphatidylcholine, have been examined by steady-state and time-resolved fluorescence in spread monolayers of several lipids to determine the effects of molecular organization on lipid dynamics. It is found that excimer formation responds markedly to compression in monolayers of unsaturated lipids, such as dioleoylphosphatidylcholine (DOL) and dielaidoylphosphatidylcholine (DEL). As expected, excimer decay was found to be little affected by lipid packing. For dipalmitoylphosphatidylcholine (DPL) systems, discontinuous changes in photophysical behavior are seen at the lipid phase transition. These types of behavior are consistent with those observed for dipyrenyl compounds in vesicles and lend themselves to a parallel data treatment. The kinetics of this probe were also measured in bulk solutions of known viscosity to provide some comparison with the data found in monolayers. 10 refs., 8 figs.
ISSN:0743-7463
1520-5827
DOI:10.1021/la00032a032