Thermochromic Properties of Mixture Systems of Octadecylphosphonic Acid and Fluoran Dye

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We have examined the thermochromic behavior of thin films formed by mixing a fluoran dye (FD: 2'-(o-chloroanilino)-6'-di-n-butylaminospiro[isobenzofuran-1(3H),9'-[9H]xanthene]-3-one) and octadecylphosphonic acid (P18). The coloring and discoloring states were revealed to be controllable by changing the rate of cooling from the colored mixture liquid (100℃); quenching at 0℃ maintained the solidified colored state, yet discoloring occurred after slow cooling at the rate of 4℃/min. We confirmed by X-ray diffraction and FT-IR spectra that the solidified colored state is produced by formation of the supramolecules, in which seven molecules of P18 and one molecule of FD combined, whose aggregates are in a lamellar structure. In the discoloring state, the supramolecule is decomposed to P18 and FD due to the fractional crystallization of P18.
社団法人応用物理学会の論文
1994-10-15