| abstract |
An indole compound represented by general formula (I): n n n n n n n n n n Wherein R 1 and R 2 each represent a hydrogen atom, a hydrocarbon group having 1 to 30 carbon atoms or a substituent represented by general formula (II); R 3 and R 4 each represent an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms or an aryl group having 6 to 30 carbon atoms; R 5 , R 6 , R 7 , and R 8 each represent a hydrogen atom, a hydrocarbon group having 1 to 30 carbon atoms, a halogen atom, a hydroxyl group, a nitro group, a cyano group, NHR or NR′R″; R, R′, and R″ each represent an alkyl group having 1 to 10 carbon atoms, or R′ and R″ are taken together to form a ring; or R 5 and R 6 , or R 6 and R 7 , or R 7 and R 8 may be taken together to form a ring; An q− represents a q-valent anion; q represents 1 or 2; and p represents a coefficient necessary to maintain charge neutrality. |