| 摘要 |
The indolium compounds of the present invention are represented by general formula (I) below and exhibit thermal decomposition behavior further suitable for optical recording materials used in an optical recording layer of an optical recording medium for high-speed recording.
(In the formula, ring A represents a benzene or naphthalene ring; Z represents, for example, an optionally halogenated C 1-8 alkyl group that is optionally interrupted by -O-, -CO-, -OCO-, or -COO-; at least one of R 1 and R 2 represents a group represented by general formula (II) or (III), and when only one of R 1 and R 2 is a group represented by general formula (II) or (III), the other represents a C 1-30 organic group; R 3 and R 4 each represent a hydrogen atom, a C 1-30 organic group, or others; X represents a C 1-8 alkyl group, which is optionally substituted with a halogen atom or a hydroxyl group or optionally interrupted by an ether bond, or others; Y 1 represents a hydrogen atom or a C 1-30 organic group; n represents an integer of 0 to 4, q represents an integer of 0 to 4; An m- represents an m-valent anion; m represents 1 or 2; and p represents a coefficient to keep the electric charge neutral.)
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