Effects of β-Cyclodextrin on Fluorescence Quenching of Sodium 1-Pyrenesulfonate by Aniline in Aqueous Media

Abstract

β-Cyclodextrin added to the fluorescence quenching system of the title compounds has two effect, depression on dynamic quenching and binding between the fluorescer and quencher causing rapid quenching.

Formation and decay of pyrene radical cation and pyrene dimer radical cation in the absence and presence of cyclodextrins during resonant two-photon ionization of pyrene and sodium 1-pyrene sulfonate

“…The absorption peak of PySA À in the presence of bCD and gCD shifted slightly to the longer wavelength region because of the inclusion of PySA À in the ground state in bCD and gCD. [34][35][36] The association constant of 1:1-inclusion compound between PySA À and bCD (PySA À /bCD) was found to be 30 M À1 by Harada et al 35 The absorption spectrum of PySA À included in gCD showed peaks at around 375 nm, and the fluorescence spectrum showed peaks at 396 and 486 nm. Two peaks at 396 and 486 nm in the fluorescence spectra were assigned to PySA À in the singlet excited state ( 1 PySA À *) and the excimer, respectively.…”

“…8,9 Inclusion of one or two Pys in cyclodextrins (CD) results from hydrophobic interaction between Py and the inside cavity of CD, 26 while the inclusion effects on 1 Py* and 1 Py 2 * have been studied by fluorescence enhancement. 10,[27][28][29][30][31][32][33][34][35][36] Formation of Py radical anion from the reaction of PySA À and hydrated electron (e aq À ) and the CD inclusion effect on the reaction have been reported during pulse radiolysis of PySA À in water in the presence of CD. 37 However, the inclusion effects on the formation and decay of Py þ and Py 2 þ have not been reported.…”

Inclusion complexation of a few pyrylium salts by β-cyclodextrin studied by fluorescence, NMR and laser flash photolysis

“…If this happens, the quenching rates would be larger in the presence of b-CD. 44,45 In order to gain a better understanding of the electron transfer reaction, transient absorption spectra were recorded in the case of 3 encapsulated in b-CD. It has been shown that Ñash photolysis of pyrylium saltÈ2-NS lead to formation of pyranyl radical 430È480 nm) and 2-NS radical cation (j max (600È700 nm).48 Laser Ñash photolysis of the 3È2-NS system using the 355 nm light from a Nd : YAG laser gave the transient spectrum shown in Fig.…”

Interactions of aluminum ions in cationic and anionic amphiphilic nematic liquid crystalline solutions

“…The dipole coupling, eq 2, like the quadrupole splitting, /¡7h2 (2> is dependent on an order parameter and as well the magnetogyric ratio, 7H, and the internuclear distance, r¡j. The order parameter, Sy, contains within it many of the same components for micelle (11) (15) Lawson, K. D.; Flautt, T. J. J. Am.…”