| 摘要 |
An optical recording medium having a substrate and an optical recording layer on the substrate. The optical recording layer is formed of an optical recording material containing at least one heterocyclic compound represented by general formula (III):
wherein Z 1 represents oxygen, sulfur, -CR 5 R 6 -, etc. (R 5 and R 6 are each a substituent, e.g., an alkyl group or an aralkyl group, or are taken together to form a ring); R 1 and R 2 each represent hydrogen, etc.; R 3 and R 4 each represent an alkyl group having 1 to 8 carbon atoms or are taken together to form a heterocyclic ring having no multiple bond; An' - represents a q-valent anion; q represents 1 or 2; p represents a number necessary to neutralize an electric charge; and m represents a number of 1 to 4.
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