Yoneda, EijiGraetzel, MichaelNazeeruddin, Md.2015-09-222015-09-222015-09-222012https://infoscience.epfl.ch/handle/20.500.14299/118532A dyestuff shown by the formula (1), ML 1 L 2 L 3 (1) wherein M represents an element belonging to Group 8 to Group 10 of the long format Periodic Table, L 1 and L 2 individually represent a bidentate ligand shown by the formula (2), L 3 represents a bidentate ligand shown by the formula (3), wherein R 1 and R 2 individually represent a carboxyl group or a group equivalent to the salt of the carboxyl group, wherein X represents a halogen atom and n is an integer of 0 to 2.patentEP2036955JP2009067976EP203695539735339