| abstract |
This invention relates to an optical information recording medium, characterized by having an organic thin film recording layer containing at least one of triaryl methane type coloring matters expressed by the general formula (1), (2) or (3): <IMAGE> (1) <IMAGE> (2) (wherein, in the above formulas (1) and (2), Ar1, Ar2 and Ar3 may be the same or different and represent a substituted or non-substituted arylene group, at least one pair of optical two nitrogen atoms bonded with said arylene groups being connected by an atomic chain having at least ten carbon atoms in total number in the shortest way; R1, R2, R3, R4, R5, R6 and R7 may be the same or different and represent hydrogen atom, aliphatic hydrocarbon group, cycloaliphatic hydrocarbon group, aromatic hydrocarbon group, halogen group, oxygen-containing characteristic group, ether group, carboxylic acid group, carboxylic acid ester group, acyl group, oxygen-containing complex group, sulfur-containing characteristic group, one nitrogen atom-containing characteristic group, two nitrogen atom-containing characteristic group or heterocyclic group; and X- represents and acid anion); or <IMAGE> (3) (wherein in the above general formula (3), Ar4, Ar5 and Ar6 may be the same or different and represent a substituted or non-substituted aryl group; and X- represents an acid anion; provided that at least one of said three aryl groups is a group expressed by the general formula, <IMAGE> wherein Z represents <IMAGE> R8, R9, R10 and R11 may be the same or different and represent hydrogen atom, aliphatic hydrocarbon group, cycloaliphatic hydrocarbon group, aromatic hydrocarbon group, halogen group, oxygen-containing characteristic group, ether group, carboxylic acid group, carboxylic acid ester group, acyl group, oxygen-containing complex group, sulfur-containing characteristic group, one nitrogen atom-containing characteristic group, two nitrogen atom-containing characteristic group or heterocyclic group; 1 represents 0 or an integer of 1 to 3; and m represents 0 or an integer of 1 to 4). |