BETA-CYCLODEXTRIN INDUCED ROOM-TEMPERATURE PHOSPHORESCENCE FROM 1-BROMONAPHTHALENE IN THE PRESENCE OF NAPHTHALENE AND 1-BUTANOL

Intense room temperature phosphorescence (RTP) from host-guest inclusi on complex of beta-cyclodextrin (beta-CD) with 1-bromonaphthalene (1-B rN), stabilized by naphthalene (N) and 1-butanol (B), has been investi gated. The spectral characteristics of luminescence emission and optim al conditions involved are reported. It has been confirmed that N and B are incorporated into the nonpolar cavity of beta-CD as the second a nd third guests. The extra space inside the cavity is more filled by N and B, and beta-CD more effectively shields 1-BrN from quencher in aq ueous solution. B completely hinders the formation of N excimer. Great er rigidity of the complex was achieved. Consequently, much more inten se fluorescence and phosphorescence appear in comparison with the tern ary beta-CD:1-BrN:B complex. The limit of detection is 7.38 x 10(-8) m ol 1(-1) for 1-BrN and 1.36 x 10(-6) mol 1(-1) for N.