Information recording medium and oxonol compound

摘要

An optical information recording medium has a recording layer coposed essentially of an oxonol compound of the following formula: in which each of R¹, R² and R³ is a substituent group X^k+ is an onium ion, each of p and q is an integer of 0 to 4, r is an integer of 1 to 5, n is 0 or 1, k is an integer of 1 to 10, and in the case that p or q is an integer of 2 or more, plural substituent groups represented by R¹ or R² are the same or different or they can connect with each other to form a ring.