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 C1-8 alkyl group that is optionally interrupted by -O-, -CO-, -OCO-, or -COO-; at least one of R1 and R2 represents a group represented by general formula (II) or (III), and when only one of R1 and R2 is a group represented by general formula (II) or (III), the other represents a C1-30 organic group; R3 and R4 each represent a hydrogen atom, a C1-30 organic group, or others; X represents a C1-8 alkyl group, which is optionally substituted with a halogen atom or a hydroxyl group or optionally interrupted by an ether bond, or others; Y1 represents a hydrogen atom or a C1-30 organic group; n represents an integer of 0 to 4, q represents an integer of 0 to 4; Anm- represents an m-valent anion; m represents 1 or 2; and p represents a coefficient to keep the electric charge neutral.)
本发明的
吲哚鎓化合物由以下通式(I)表示,其热分解行为进一步适用于高速记录的光学记录介质的光学记录层中使用的光学记录材料。
(式中,环 A 代表苯环或
萘环;Z 代表例如任选被-O-、-CO-、-OCO-或-COO-打断的任选卤代 C1-8 烷基;R1 和 R2 中至少有一个代表通式(II)或(III)所代表的基团,当 R1 和 R2 中只有一个是通式(II)或(III)所代表的基团时,另一个代表 C1-30 有机基团;R3 和 R4 分别代表氢原子、C1-30 有机基团或其它; X 代表 C1-8 烷基,可任选被卤原子或羟基取代,或任选被醚键打断,或其它; Y1 代表氢原子或 C1-30 有机基团; n 代表 0 至 4 的整数,q 代表 0 至 4 的整数; Anm- 代表 m 价阴离子;m 代表 1 或 2;p 代表保持电荷中性的系数。)