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1 Polish Journal of Chemistry

1 2001

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Solvatochromism of 1-(p-Aminostyryl)pyridium Salts

Gawinecki R., Trzebiatowska K.

Polish Journal of Chemistry

2001

Vol. 75, nr 2

231-239

Solvatochromism of eighteen 1-methyl-(p-aminostyryl)pyridinium perchlorates was studied. For each solvent the V~ max values follow the R o substituent constants of the amino groups present in the molecule. The V~ max values for compounds are usually highest and lowest in water and in methylene chloride, respectively. The substituent bathochromic shifts in some solvents are as large as 5700 cm-1. No inverted solvatochromism is observed. Analysis of the spectra do not confirm also this effect to be negative. Dependence between the band position and solvent polarity, hydrogen bond donor acidity and hydrogen bond acceptor basicity is of low quality. There is no simple relationship between the V~ max values and the solvent dielectric constants.