'''Solvatochromism''' is the ability of a chemical substance to change colour due to a change in solvent polar molecule|polarity Negative solvatochromism corresponds to hypsochromic shift positive solvatochromism corresponds to bathochromic shift with increasing solvent polarity The sign of the solvatochromism depends on the polarity of the molecule of the dye in its ground state
An example of positive
solvatochromism is the 44'-bisfuchsone which is orange in nonpolar toluene red in slightly polar
acetone and red-violet in more polar
methanolExamples of negative
solvatochromism are 2--N-methyl-quinolinium betaine which is ink-blue in nonpolar chloroform and blood-red in polar water and 4-(4'-hydroxystyryl)-N-methyl-pyridinium iodide which is violet in
n-
butanol red in
n-propanol orange in
methanol and yellow in
waterUses
Solvatochromism can be used in environmental sensors and in molecular electronics for
construction of
molecular switchesSee also
- Bathochromic shift
- Hypsochromic shift
External links
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