Organometallic complex, and light-emitting element and light-emitting device using the same

An organometallic complex comprising a structure represented by formula (G3),

• wherein X represents —N(R30)—,
• wherein R30 represents an aryl group having 6 to 12 carbon atoms, or a heteroaryl group having 4 to 10 carbon atoms,
• wherein at least one of R21 to R29 represents a fluorine, or a trifluoromethyl group, and
• wherein the others of R21 to R29 each represent any of hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an alkoxycarbonyl group having 2 to 6 carbon atoms, an acyl group having 1 to 6 carbon atoms, an acyloxy group having 1 to 6 carbon atoms, and an aryl group having 6 to 12 carbon atoms.

An organometallic complex comprising a structure represented by formula (G3),

• wherein X represents —N(R30)—,
• wherein R30 represents a phenyl group having at least one electron-withdrawing substituent,
• wherein at least one of R21 to R29 represents a fluorine, or a trifluoromethyl group, and
• wherein the others of R21 to R29 each represent any of hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an alkoxycarbonyl group having 2 to 6 carbon atoms, an acyl group having 1 to 6 carbon atoms, an acyloxy group having 1 to 6 carbon atoms, and an aryl group having 6 to 12 carbon atoms.