Metallized azo dianion with two cationic dye counter ions for optical information recording medium.

摘要

There is disclosed a recordable optical element that includes a recording layer. The element has a transparent substrate and on the surface of the substrate, a) a recording layer containing a light absorbing material and b) a light reflecting layer, the improvement wherein said light absorbing material has the structure: wherein; R is hydrogen, alkyl having from 1 to 20 carbons, substituted or substituted aryl from 6 to 10 carbon atoms; R1 represents hydrogen or an alkyl group of from 1 to 6 carbon atoms; R2 represents a hydrogen, an alkyl group of from 1 to 5 carbon atoms; SO2R''' or SO2NHR''' where R''' is an alkyl group from 1 to 10 carbon atoms; an aryl group of from 6 to 10 carbon atoms or a hetaryl group of from 5 to 10 carbon atoms or a halogen atom; R3 represents hydrogen, an alkyl group of from 1 to 4 carbon atoms or a halogen atom; R4 represents alkyl group 1 to 10 carbon atoms; SO2R''', SO2NHR''' where R''' is an alkyl group from 1 to 10 carbon atoms; an aryl group of from 6 to 10 carbon atoms or a hetaryl group of from 5 to 10 carbon atoms or a halogen atom; R5 represents an electron withdrawing group such as NO2, CN, SO2R'''', SO2NRR where R'''', R or R each independently can represent a hydrogen, an alkyl group of from 1 to 5 carbon atoms; an aryl group of from 6 to 10 carbon atoms; a hetaryl group of from 5 to 10 carbon atoms; or a cycloalkyl group of from 5 to 7 carbon atoms; R6 represents hydrogen; an alkyl group of from 1 to 5 carbon atoms; or a halogen atom; X represents oxygen, sulfur or carboxyl or sulfo groups; and Dye<+> can be any dye that has one or more positive charges.