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IJBB Vol.40(6) [December 2003] >


Title: Effect of side chain length on the aggregation of amphiphilic 5,10,15-tris (1-methylpyridinium-4-yl)-20-[4-(alkoxy) phenyl] 21H, 23H porphyrin tritosylates
Authors: Chauhan, S M S
Kumar, Anil
Srinivas, K A
Mishra, M K
Keywords: Aggregation
binary solvent
amphiphilic porphyrins
vesicles
higher aggregates
Issue Date: Dec-2003
Publisher: CSIR
Abstract: Self-aggregation of cationic amphiphilic 5, 10, 15-tris-(1-methylpyridinium-4-yl)-20-[4-(alkoxy)phenyl]-21H, 23H porphyrin tritosylates (2a-e) with different alkoxy chain length in aqueous and binary solvent systems has been studied by UV-visible, fluorescence and 1H NMR spectroscopy. Binary solvent, concentration, ionic strength, presence of surfactants, and temperature govern the aggregations of 2a-e. Porphyrins having side chain length more than ten carbon atoms (2c-e) form higher aggregates, such as vesicles by sonication of dimers formed initially, whereas porphyrins with lesser side chain length (2a & b) form lower aggregates only. Further, the size and the formation of vesicles have been confirmed by transmission electron microscopy (TEM) and dye entrapment experiments for 2e.
Page(s): 429-438
ISSN: 0301-1208
Source:IJBB Vol.40(6) [December 2003]

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