| abstract |
The present invention relates to an optical information recording medium comprising a recording layer applied directly on a substrate or applied on a substrate by intervening an underlayer therebetween, and further comprising a protective layer on said recording layer if necessary, characterized in that said recording layer contains at least one of the compounds expressed by the following general formula (I) or (II): <IMAGE> (I) <IMAGE> (II) (wherein in the above formulas, X1 to X3 represent O, S or Se; A- represents an anion; l, m or n represents 0 or 1; R4 represents a substituted or non-substituted aryl group or heterocyclic group; R3, R5, R6, R9, R10 and R11 represent hydrogen or an alkyl group; R1, R2, R7, R8, R12, and R13 represent hydrogen or a substituted or non-substituted alkyl, aryl or styryl group; Z1, Z3 and Z5 represent atomic groups necessary for forming a substituted or non-substituted pyrylium, thiapyrylium, selenapyrylium, benzopyrylium, benzothiapyrylium, benzoselenapyrylium, naphthopyrylium, naphthothiapyrylium or naphthoselenapyrylium; Z2 and Z4 represent atomic groups necessary for forming a substituted or non-substituted five-membered ring or six-membered ring; and said five-membered ring and six-membered ring may be condensed with an aromatic ring). |