| 摘要 |
A cyanine compound represented by formula (I): <CHEM> wherein ring A and ring B each represent a substituted or unsubstituted benzene ring or a substituted or unsubstituted naphthalene ring; R<1>, R<2>, R<3>, and R<4> each represent an alkyl group having 1 to 4 carbon atoms or a substituted or unsubstituted benzyl group, or R<1> and R<2> are taken together, or R<3> and R<4> are taken together, to form a 3- to 6-membered ring, provided that at least one of R<1>, R<2>, R<3>, and R<4> is a substituted benzyl group; Y<1> and Y<2> each represent an organic group having 1 to 30 carbon atoms; An<m-> represents an m-valent anion; m represents an integer 1 or 2; and p represents a coefficient for maintaining overall charge neutrality. |
