| 摘要 |
PURPOSE:To obtain an ammonia detecting reagent, by utilizing the fact that a certain leucobenzylidene compound is superior in an ammonia detecting sensitivity to a nitrated leuco dye, keeps the sensitivity in a dry state or in a hydrophobic medium, and has better stability against light and heat. CONSTITUTION:A compound of formulaIis found to be superior in an ammonia detecting sensitivity to a nitrated leuco dye, keeps the sensitivity in a dry state or in a hydrophobic medium, and stability against light and heat, and is utilized as an ammonia detecting reagent. In formulaI, A is an electron-donating group such as oxygen or sulfur, L is a (substituted) methine group, Z<2> is 5- or 6-membered monocyclic or bicyclic heterocyclic nucleus, X<(-)> is an acid anion, Z' is an atom group necessary to form a benzene ring or a naphthalene ring, E is nitro, cyano, etc., m and p are each 0 or 1, and n is 1 or 2. |
