title: The styrylpyridine dye for the silane sol-gel transition studies by time-dependent fluorescence.
abstract: A trans-4-(p-N,N-dimethylaminostyryl)-N-vinylbenzylpyridinium chloride (vbDMASP) fluorescence probe was optimized in ground and excited state as a function of change in the microenvironment polarity, using the Amsol HyperChem program package. In the calculations, protic and aprotic solvents were used. On this basis a change in the molecule geometry after excitation, depending on the surrounding solvent, was determined. Absorption and steady-state fluorescence spectra of vbDMASP in the solvent of different polarity and in the model water-glycerol solutions were also recorded. On the basis of Stokes' shift change with the Onsager polarity scale a change in the dipole moment of the probe during transition from ground to excited state, in protic and aprotic solvents was determined. Since during the sol-gel transition of tetraethylorthosilane in the acidic environment both polarity and viscosity of the microenvironment change the vbDMASP probe was applied and fluorescence time-resolved measurements were done. On this basis the correlations between the results of time-resolved measurements for the multichromophoric probe applied in the gelation process and molecular optimization data are discussed.
authors.affiliation: Institute of General Food Chemistry, Technical University of Łódź, ul. Stefanowskiego 4/10, 90-924 Łódź, Poland.
authors.forename: Donata
authors.initials: D
authors.lastname: Jóźwik
authors.forename: Ewa
authors.initials: E
authors.lastname: Miller
authors.forename: Barbara
authors.initials: B
authors.lastname: Wandelt
authors.forename: Stanisław
authors.initials: S
authors.lastname: Wysocki
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D005782:Gels / Q000737:chemistry*; D011726:Pyridinium Compounds / Q000737:chemistry*; D012821:Silanes / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods
chemical_list: C500828:4-(4-N,N-dimethylaminostyryl)-N-vinylbenzylopyridinium chloride; D000814:Aniline Compounds; D005782:Gels; D011726:Pyridinium Compounds; D012821:Silanes