| abstract |
An optical recording medium contains silicon naphthalocyanines of the formula ##STR1## where Nc is the radical of a naphthalocyanine system which may be substituted by alkyl, alkoxy, aryl or aralkyl, and n R 1 and R 2 are each independently of the other a radical of the formula (O) n R 3 , where n is 0 or 1 and R 3 is an unsubstituted radical, or ##STR2## where R 3 is as defined above and R 4 and R 5 are each independently of the other alkyl, alkoxy or (O) n R 3 or R 1 is alkyl. |