New reversible discoloration Characteristic chemical compound and the reversible discoloration Characteristic material null which uses

摘要

NEW MATERIAL:A reversible compound of formula I or formula II (R1-R6 are H, hydrocarbon groups and/or 1-15C aliphatic group, 5-10C alicyclic and/or 6-12C aromatic groups which may be substituted with substituents other than aliphatic groups; in addition, when at least one selected from R1-R3 and at least 2 groups are residues other than H, they may be incorporate with each other to form a ring; X- is monovalent anion). EXAMPLE:4,4'-bis[(B-benzyl-ammonio)phenyl]methane di-p-toluenesulfonate. USE:A reversibly color-changing material excellent in thermal stability with the passage of time, response, durabilityl and reversibility. It is used as a photochromic or thermochromic material. PREPARATION:4,4-Bis(aminophenyl)methane (MDA) is subjected to N-substituion with a hydrocarbon group or N-substituted aniline is condensed using formalin to give N-hydrocarbon-substituted MDA. The product is allowed to react with an acid or halide to give the compound of formula I-II.