Electrochemical and Photophysical Behavior of 1-Naphthol in Benzyl-n-hexadecyldimethylammonium 1,4-bis (2-ethylhexyl) Sulfosuccinate Large Unilamellar Vesicles.

AIRAM COBO SOLIS; CORREA N M; P G MOLINA

PHYSICAL CHEMISTRY CHEMICAL PHYSICS

ROYAL SOC CHEMISTRY

Lugar: CAMBRIDGE; Año: 2016 vol. 18 p. 15645 - 15653

1463-9076

In the present contribution, 1-naphthol is investigated in large unilamellar vesicles formed from a new catanionicsurfactant, benzyl-n-hexadecyldimethylammonium 1,4-bis(2-ethylhexyl)sulfosuccinate, by electrochemical andspectroscopic techniques. The electrochemical results show that 1-naphthol experiences a partition processbetween the water phase and the large unilamellar vesicle bilayer phase, which is corroborated by absorptionspectroscopic studies at pH = 6.40 and pH = 10.75. Interestingly, studies of 1-naphthol emission in benzyl-nhexadecyldimethylammonium1,4-bis(2-ethylhexyl)sulfosuccinate large unilamellar vesicles at pH = 10.75 and insodium 1,4-bis(2-ethylhexyl)sulfosuccinate water solution show that when the 1,4-bis(2-ethylhexyl)sulfosuccinatemoiety is part of the bilayer, the 1,4-bis(2-ethylhexyl)sulfosuccinate polar head interacts strongly with 1-naphthol,by favoring emission from the excited neutral species resulting in the appearance of a new band closeto l = 355 nm. It seems that the large unilamellar vesicle bilayer of the catanionic vesicle slows downthe proton transfer process observed in water, where only emission from 1-naphtholate is detected