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A New Chiral Bithiophene Based on Derivatization of 1,1'-Binaphthyl-2,2'-diol

Drabowicz J., Krasowska D., Mielniczak A.

Polish Journal of Chemistry

2007

Vol. 81, nr 11

1983-1985

The synthesis of a new chiral 2,2'-dihydroxy-1,1' - binaphthyl derivative containing protected hydroxyl groups and bithiophene-functionalities is described. The cross-coupling Pd-catalyzed reaction of suitably functionalized substrates under Negishi reaction conditions constitutes the most effective protocol for preparation of rac-6,6'- bis(5- methyl- 2,2'-bithiophen-5'-yl)-2,2'-dimethoxy-1,1'-binaphthyl 5.

4-(4-Dimethylaminostyryl)pyridinium derivative: a solvent viscosityand polarity-sensitive fluorescent sensor

Mielniczak A., Wandelt B., Wysocki S.

Materials Science

2002

Vol. 20, No. 4

59-68

Trans-4-(p-N,N-dimethylaminostyryl)-N-vinylbenzylpyridinium chloride (1) is a newly synthesised multichromophore chemosensor. This molecule displays strong intramolecular charge transfer properties. It fluorescences in a very favourable region (480-650 nm in polar and viscous solutions) for its use as a sensing system. Steady-state and time-resolved fluorescence spectroscopy have been used to characterize photophysical properties in viscous and non-viscous polar solutions. We investigated the influence of solvent viscosity on the rate constants of radiative and non-radiative processes of deactivation of (1) in aqueous solutions.