- Water-induced fluorescence quenching of mono- and dicyanoanilines
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Photophysical properties of monocyano- (2-, 3-, and 4-cyano) and dicyano- (3,4-, 3,5-, 2,3-, 2,4-, 2,5-, and 2,6-dicyano) anilines are investigated by fluorescence measurements. All the monocyanoanilines are virtually nonfluorescent in water (quantum yield 0.01); however, in nonaqueous solvents (cyclohexane, acetonitrile and ethanol), the fluorescence quantum yield is enhanced substantially. In contrast, dicyanoanilines investigated are highly fluorescent both in aqueous and nonaqueous environments. The photophysical data and MO calculations suggest that conformational changes in the amino group and variation of hydrogen-bonding interactions between the solute and solvent water upon electronic excitation are responsible for the water quenching in the monocyanoanilines.
- Oshima, Juro,Yoshihara, Toshitada,Tobita, Seiji
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p. 306 - 311
(2008/02/13)
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- Model Substances for Electro-optical and Dielectric Studies, Part I. Synthesis and Structure of 1,4-Bis(4'-dimethylamino-3',5'-dicyanophenyl)bicyclooctane
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A synthesis for a new 1,2,6-donor-acceptor-substituted chromophoric benzene system is given.This chromophore is incorporated in a bicyclooctane system to build up model compounds for electro-optical and dielectrical studies.Furthermore a preparative convenient route to derivatives of 1,4-bis(diphenyl)bicyclooctane is worked out.The structures of the new compounds are proven by spectroscopical means. - Key words: 1,2,6-Donor-Acceptor-Substituted Benzenes, 1,4-Bis(diphenyl)bicyclooctane Derivatives
- Detzer, Norbert,Burkhard, Oswald,Schaffrin, Heinz,Liptay, Wolfgang
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p. 1129 - 1141
(2007/10/02)
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