| abstract |
Fine particles containing a compound represented by the general formula (1): wherein R 1a and R 1b may be the same or different and each independently represents an alkyl group, an aryl group, or a heteroaryl group; R 2 and R 3 each independently represent a hydrogen atom or a substituent, at least one of R 2 and R 3 is an electron-withdrawing group, and R 2 and R 3 may form a ring together; And R 4 represents a hydrogen atom, an alkyl group, an aryl group, a heteroaryl group, a substituted boron, or a metal atom, and R 4 may be covalently bonded or coordinated to R 1a , R 1b and / or R 3 . |