Tridentate Platinum (II) Complexes

A platinum (II) complex of the formula,

• wherein:
• Ar1 represents a 1,3-diazole ring,
• Ar2 represents a idine ring,
• Ar3 represents a phenyl ring, and Ar1, Ar2, and Ar3 together form a tridentate ligand coordinated to the platinum through atoms X, Y, and Z, respectively, wherein X is nitrogen, Y is nitrogen, Z is carbon,
• —V— is selected from the group consisting of
• wherein each R independently represents an alkyl group, a haloalkyl group, an aralkyl group, an alkenyl group, alkynyl group, an aryl group, an amino group, a mono- or di-alkylamino group, a mono- or diaryl amino group, an alkoxy group, an aryloxy group, a heteroaryloxy group, an alkoxycarbonyl group, an acyloxy group, an acylamino group, an alkoxycarbonylamino group, an aryloxycarbonylamino group, a sulfonylamino group, a sulfamoyl group, a carbamoyl group, an alkylthio group, a sulfinyl group, an ureido group, a phosphoramide group, a hydroxyl group, a mercapto group, a halogen atom, a cyano group, a sulfo group, a carboxyl group, a nitro group, a hydrazino group, a substituted silyl group, or a polymerizable group, and
• W is an anion.