Side-chain-controlled H- and J-aggregation of amphiphilic porphyrins in CTAB micelles.
The aggregation behavior of a series of amphiphilic 4-hydroxyphenyl porphyrins with one (P1), two (P2) and three (P3) hexadecyl side chains in cetyltrimethylammonium bromide (CTAB) micelles has been studied by means of UV-vis and fluorescence spectra. It was found that the number of hexadecyl side chains not only controls the H- and J-aggregation of the porphyrins in CTAB micelles, but also influences the aggregation concentration and tendency. With increasing porphyrin concentration, P1 and P2 form H-aggregates in CTAB micelles, while P3 forms J-aggregates. Porphyrins with more hexadecyl side chains tend to form aggregates more easily and at lower concentrations in CTAB micellar solutions.
Guo
Lin
L
Key Laboratory of Mesoscopic Chemistry of MOE and School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, PR China. linguo@nju.edu.cn
D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D007700:Kinetics; D008823:Micelles; D011166:Porphyrins / Q000737:chemistry*; D012995:Solubility; D012996:Solutions / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D013501:Surface-Active Agents / Q000737:chemistry*
D002593:Cetrimonium Compounds; D008823:Micelles; D011166:Porphyrins; D012996:Solutions; D013501:Surface-Active Agents; D000077286:Cetrimonium