| 摘要 |
PURPOSE:To obtain high sensitivity and high durability which are substantially practicable by incorporating a specific bisazulenium salt compd. into a titled compsn. CONSTITUTION:This compsn. comprises at least one kind of the bisazulenium salt compd. expressed by the formula I, II or III. In the formulas, R<1> denotes a hydrogen atom, lower alkyl group, etc., or the substitution product thereof, R<2> and R<2> denote a hydrogen atom, halogen atom, etc., or the substitution product thereof, R<4> denotes a hydrogen atom, alkyl group, etc., or the substitution product thereof, R<5>-R<11> denote a hydrogen atom, hydroxy group, etc., or the substitution product thereof. A substd. or unsubstd. arom. ring may be formed by at least one combination among the combinations; R<5> and R<6>, R<7> and R<8>, R<8> and R<9>, R<9> and R<10>, and R<10> and R<11>. B<1>, B<2> denote a hydrogen atom, lower alkoxy group, etc., or the substitution product thereof, Y denotes -O-, etc., R<12>, R<13> denote a hydrogen atom, halogen atom, etc., or the substitution product thereof. |
