Patent ID: 7579092

Claim:
A cyclometalated transition metal complex represented by Formula 1: M(C^N)(C^N)′(CN—R)X (1) wherein M is a transition metal selected from the group consisting of Ru, Rh, Ir, Os, Pt, and Au; each (C^N) and (C^N)′ is a cyclometalated ligand; R is aryl, aryloxy, aryloxycarbonyl, heteroaryl, arylthio, aralkyl, heteroaralkyl, or aralkenyl; and X is one selected from the group consisting of OCN, CN, SCN, P(Ph) 2 , R′COO, R′CONH, R′NH, pyrazole, substituted alkyl, unsubstituted alkyl, substituted alkoxy, unsubstituted alkoxy, substituted aryloxy, unsubstituted aryloxy, NR′H, NR′ 2 , OH, SH, and a sulfonic acid group, wherein R′ is an alkyl group of 1-10 carbon atoms, a cycloalkyl group of 5-14 carbon atoms, or an aryl group of 5-14 carbon atoms.