직/편성물 염색

Phenomena Involving a Reversible Colour Change.

  • 출판일2002.06
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 294
Chemical reactions due to photochromism, thermochromism, ionochromism, electrochromism, and solvatochromism result in color changes in affected materials. Such photochromic compounds as spirobenzopyrans, fulgides and diarylethenes have applications in opthalmics, optical memory and switches, and the photoregulation of enzymes. Reversible thermochromic organic systems require heat to initiate a color change, whereas some inorganic systems require molecular rearrangement. Common ionochromic compounds include such pH sensitive dyes as phthalides, triarylmethanes, and fluorans. Ionochromic pigments are used in analytical chemistry, carbonless copying paper, and direct thermal printing. Electrochromic cells exhibit color changes in the presence of an electric current. Solvatochromism features shifts in the maxima of absorption or emission spectra due to differences in the solvation energies in the ground and excited states. 102 refs.
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