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.
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 (I)H 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.
Department of Chemistry, University of Delhi, Delhi 110 007, India. smschauhan@chemistry.du.ac.in
S M S
SM
Chauhan
Anil
A
Kumar
K A
KA
Srinivas
M K
MK
Mishra
D057927:Hydrophobic and Hydrophilic Interactions; D058105:Polymerization; D011166:Porphyrins / Q000737:chemistry*; D013057:Spectrum Analysis
D011166:Porphyrins