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• W2045249564 abstract "Electronic absorption, and excitation spectra of 1-methyl-4-[4-aminostyryl] pyridinum iodide (M-NH2) were measured in solvents of different polarity. The (M-NH2) dye exhibits negative solvatochromism, i.e. a hypsochromic band shift as the solvent polarity increases. The fluorescence quantum yield is also sensitive to the polarity and viscosity of the medium. The ground and excited state protonation constants were calculated and amount to 3.35 and 0.62, respectively. The effect of micellization on the emission spectrum of (M-NH2) are also studied in sodium dodecyl sulphate (SDS). The fluorescence intensity increases as the concentration of SDS increases with an abrupt change at cmc. The quantum yield of the cis trans photoisomerization is also determined in aqueous buffer solution of pH 1.1." @default.
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• W2045249564 date "2003-01-01" @default.
• W2045249564 modified "2023-09-26" @default.
• W2045249564 title "Influence of solvent polarity and medium acidity on the UV–Vis spectral behavior of 1-methyl-4-[4-amino-styryl] pyridinum iodide" @default.
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• W2045249564 doi "https://doi.org/10.1016/s1386-1425(02)00182-8" @default.
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