| abstract |
Siliconnaphthalocyanines of the formula in the Nc is the residue of a naphthalocyanine system which is optionally substituted by alkyl, alkoxy, aryl or aralkyl, and R¹ and R² independently of one another are a radical of the formula (O) n R³, where n is 0 or 1 and R³ is an unsaturated radical, or in which R³ has the abovementioned meaning and R⁴ and R⁵ independently of one another are alkyl, alkoxy or (O) n R³, or the radical R¹ is also alkyl, and optical recording medium containing these silicon naphthalocyanines. |