ROOM-TEMPERATURE PHOSPHORESCENCE OF 1-BRO MONAPHTHALENE BETA-CYCLODEXTRININ ANIONIC SURFACTANT INCLUSION COMPLEXES

Intense room-temperature phosphorescence(RTP) of 1-bromonaphthalene(1- BrN) induced by anionic surfactants(AS) was studied in aerated aqueous beta-cyclodextrin(beta-CD) solution. It has been found that considera bly enhanced RTP arises from the formation of the 1:1:1/AS:1-BrN:beta- CD ternary inclusion complex. Analyses of spectral structure and surfa ce tension of solutions suggest that the hydrophobic hardrocarbon chai n of surfactants was partly included in the apolar cavity of beta -CD and the part with the polar head group of hydrocarbon chain located ou tside the cavity coiled over the top of beta-CD, providing an effectiv e protection for RTP. Since it contains a surfactant with a polar head group, the complex precipitate was homogeneously dispersed in aqueous solution and stable RTP was obtained.