Patent ID: 6551682
Filing Date: 2003-04-22
Classification: C07D,C07F,G11B,Y10T

Abstract:
An optical recording medium having a recording layer formed on a substrate, the recording layer allowing writing and/or reading information by a laser beam, in which the recording layer comprises a metal-containing azo compound represented by at least one formula which is selected from the following general formulae (a1), (a2), (a3) and (a4): wherein M(II) is a bivalent metal, each of X1 and X2 is a substituted or non-substituted residue that forms a monocyclic or polycyclic aromatic ring together with carbon atoms that are adjacent thereto at its both ends, each of Y1 and Y2 is a substituted or non-substituted residue that forms a nitrogen-containing aromatic heterocycle together with a nitrogen atom and carbon atoms that are adjacent thereto at its both ends, and a substituent when present in the residue is independently selected from the group consisting of a halogen atom, a substituted and non-substituted alkyl group, a substituted and non-substituted alkoxyl group, a substituted and non-substituted alkylthio group, a substituted and non-substituted aryl group, a substituted and non-substituted aryloxyl group, a substituted and non-substituted arylthio group, a nitro group, and a substituted and non-substituted amino group, and one residue is different from the other in at least one of a combination of X1 and X2 and a combination of Y1 and Y2.