Patent ID: 8580961

Claim:
A 2-phenyl-6-azolylpyridine-based ligand represented by the following formula (I): wherein, X represents nitrogen or C—R 10 ; R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 and R 10 independently represent hydrogen, halogen, a cyano group, an amino group, an optionally substituted aryl group, an optionally substituted heteroaryl group, sulfate, —COOH, an alkoxy group, a carbonyl group, a C 1 -C 10 haloalkyl group, a C 1 -C 12 alkyl group, a C 2 -C 10 alkenyl group, a C 2 -C 10 alkynyl group, a C 3 -C 20 cycloalkyl group, a C 3 -C 20 cycloalkenyl group, a C 1 -C 20 heterocycloalkyl group, or a C 1 -C 20 heterocycloalkenyl group; and R 9 represents hydrogen or alkali metal, wherein R 1 is CF 3 .