| abstract |
In the present invention, the following general formula (I) (wherein R 1 and R 2 are the same or different and each represents a hydrogen atom, an alkyl group which may have a substituent, etc., and R 3 and R 4 are , Which are the same or different, each represents a hydrogen atom, an alkyl group which may have a substituent, an aralkyl group which may have a substituent, and the like, and M represents a metal atom having a coordination ability , N represents an integer of 1 to 4, and a filter for an electronic display device containing a squarylium compound metal complex represented by: |