| abstract |
(57) Abstract: To provide a dye that absorbs near infrared rays. A central pyrrolo [2, 1-a] Dye containing isoquinoline nucleus: (In the formula, Ar is a phenyl group or a substituted phenyl group; R 1 is an alkyl group, an alkaryl group, an aralkyl group or an aryl group; and Z is an atomic group containing a nitrogen atom having a positive charge, a carbonyl group or a nitrile group, and the pyrrolo [2 , 1-a] The isoquinoline nucleus forms a conjugated chain between the nitrogen atom and the positively charged nitrogen atom contained in Z, a carbonyl group or a nitrile group). |