METAL COMPLEX TYPE SQUARYLIUM COMPOUNDS AND OPTICAL RECORDING MEDIA MADE BY USING THE SAME

摘要

The invention provides materials having spectral characteristics, light resistance, solubility and thermal decomposition characteristics suitable for DVD-R recording, more specifically, squarylium-metal complexes represented by the general formula (I): (I) wherein R<1> and R<2> are each independently optionally substituted alkyl, optionally substituted aralkyl, optionally substituted aryl, or an optionally substituted heterocyclic group; Q is a metal atom having ability to coordinate; q is 2 or 3; and A is optionally substituted aryl, an optionally substituted hetero- cyclic group, or Y=CH- (wherein Y is optionally substituted aryl or an optionally substituted heterocyclic group).