Optical information recording medium and novel immonium compound

An optical information recording medium comprising a substrate having provided thereon a recording layer capable of recording information by laser beam irradiation, wherein the recording layer contains at least one compound represented by the following general formula (I):

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• wherein R represents a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group;
• X represents an anion;
• m represents 0, 1 or 2;
• A represents a group represented by general formula (II) or (III), wherein n represents 1 or 2;
• and at least one of all aromatic groups in existence is substituted by an aryl group having 6 to 18 carbon atoms, an acyl group having 2 to 18 carbon atoms, an alkylsulfonyl group having 1 to 18 carbon atoms, an arylsulfonyl group having 6 to 18 carbon atoms, an alkylsulfinyl group having 1 to 18 carbon atoms, an alkoxycarbonyl group having 2 to 18 carbon atoms, an aryloxycarbonyl group having 7 to 18 carbon atoms, an aryloxy group having 6 to 18 carbon atoms, an acyloxy group having 2 to 18 carbon atoms, a sulfonyloxy group substituted by a hydrocarbon group having 1 to 18 carbon atoms, a sulfamoyl group which may be substituted by a hydrocarbon group having 1 to 18 carbon atoms, a nitro group, a cyano group or a 4- to 7-membered heterocyclic group:
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