Platinum complex for use as sensitizer for semiconductor electrode of solar cell

A platinum complex represented by the following formula (1):

• PtL1L2 (1)
• wherein
• L1 represents a ligand selected from the group consisting of 2,2′-bipyridine compounds having at least one anionic group and 1,10-phenanthroline compounds having at least one anionic group and
• L2 represents a dithiolate selected from the group consisting of those represented by the following formulas (a) through (d):
• wherein R represents an alkyl group having 1 to 6 carbon atoms, an alkoxyalkyl group having 2 to 12 carbon atoms, an aminoalkyl group having 1 to 12 carbon atoms, an alkoxycarbonyl group having 2 to 6 carbon atoms, a cyano rup or a hydrogen atom,
• wherein R represents an alkyl group having 1 to 6 carbon atoms, an alkoxyalkyl group having 2 to 12 carbon atoms, an aminoalkyl group having 1 to 12 carbon atoms, an alkoxycarbonyl group having 2 to 6 carbon atoms, a cyano group or a hydrogen atom,
• wherein R and R1 represent, independently from each other, an alkyl group having 1 to 6 carbon atoms, an alkoxyalkyl group having 2 to 12 carbon atoms, an aminoalkyl group having 1 to 12 carbon atoms, an alkoxycarbonyl group having 2 to 6 carbon atoms, a cyano group or a hydrogen atom,
• wherein R and R1 represent, independently from each other, an alkyl group having 1 to 6 carbon atoms, an alkoxyalkyl group having 2 to 12 carbon atoms, an aminoalkyl group having 1 to 12 carbon atoms, an alkoxycarbonyl group having 2 to 6 carbon atoms, a cyano group or a hydrogen atom.