CRYSTALLINE NONSOLVATED POLYMETHINE COMPOUND

摘要

A novel polymethine compound which exhibits excellent stability in a solution, a high gram absorption coefficient, and excellent storage stability and is easily handleable and highly sensitive to general-purpose semiconductor lasers, that is, the crystalline nonsolvated polymethine compound represented by the formula (I): (I) and a process for the production of the crystalline nonsolvated polymethine compound of the formula (I), characterized by reacting a polymethine ether of the general formula (II) with hydrochloric acid: (II) wherein R is alkyl, alkoxyalkyl, or optionally substituted aryl.