Structural basis for aggregation mode of oligo-p-phenylene ethynylenes with ionic surfactants.
Langmuir
; 29(51): 15732-7, 2013 Dec 23.
Article
em En
| MEDLINE
| ID: mdl-24279339
ABSTRACT
In this letter, the aggregation modes of two classes of ionic p-phenylene ethynylene oligomers with oppositely charged surfactants are studied. The location of the ionic side chains was found to influence the type of aggregate formed when an equivalent number of surfactant molecules are added to solution. When the charged groups were located at the terminal ends of the molecule, strong H-aggregates were observed to form. Alternatively, when the ionic groups were both located on opposite sides of the central phenyl ring, the formation of J-aggregates was observed. Interestingly, as the surfactant concentration approaches the critical micelle concentration, the weakly bound aggregates are dissociated and the absorbance spectrum returns to what is observed in water. This study reveals the structural basis for aggregation effects between molecules based on the p-phenylene ethynylene backbone, and gives an understanding of how to influence the aggregation mode of similar compounds.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Polímeros
/
Tensoativos
Idioma:
En
Revista:
Langmuir
Assunto da revista:
QUIMICA
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Estados Unidos