Reversible thermochromic organic materials usually consist of
at least three components namely a colour former, colour developer
and solvent. Common colour formers are electron-donating, leuco
dyes, as exemplified by spirolacones,fluorans, spiropyrans or ful-
gides. As these compounds change colour when pH is altered, they
are in reality, halochromic. Frequently used examples include
crystal violet lactone and thymolphthalein. Their reaction with the
second component, the electron-accepting developer, defines the
position of the longest wavelength absorption which causes
Reversible thermochromic organic materials usually consist ofat least three components namely a colour former, colour developerand solvent. Common colour formers are electron-donating, leucodyes, as exemplified by spirolacones,fluorans, spiropyrans or ful-gides. As these compounds change colour when pH is altered, theyare in reality, halochromic. Frequently used examples includecrystal violet lactone and thymolphthalein. Their reaction with thesecond component, the electron-accepting developer, defines theposition of the longest wavelength absorption which causes
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