| 摘要 |
PROBLEM TO BE SOLVED: To provide a write-once type optical recording medium particularly having an excellent durability by satisfactorily high density recording and reproducing with a laser having a wavelength of 520 to 690nm. SOLUTION: The optical recording medium comprises a dipyrromethene metal chelate compound represented by a formula (wherein R1 to R7 are each independently a hydrogen atom, a 20-0C substituted or unsubstituted alkyl group, alkoxy group, alkenyl group, aryl group or heteroaryl group, A is a 20-0C substituted aryl group or a substituted or unsubstituted heteroaryl group, and M is a cobalt or copper) in a recording layer. |
