Patent ID: 7709100

Claim:
A compound having the formula: wherein M is a metal selected from Ir, Pt, Rh or Pd; (X-Y) is an ancillary ligand; m is a value from 1 to the maximum number of ligands that may be attached to the metal; and m+n is the maximum number of ligands that may be attached to the metal; ring A is an aromatic heterocyclic or a fused aromatic heterocyclic having an unsubstituted alkyl substituent at the R′ 5 position and having at least one nitrogen atom, N, that is coordinated to the metal M, wherein the ring A can be optionally substituted with one or more substituents at the R′ 3 , R′ 4 and R′ 6 positions; R′ 3 , R′ 4 , and R′ 6 are each independently H, alkyl, alkenyl, alkynyl, heteroalkyl, aryl, heteroaryl, aralkyl,; and wherein R′ 3 , R′ 4 , and, R′ 6 are optionally substituted by one or more substituents Z; additionally or alternatively the R′ 3 and R′ 4 substituted positions on ring A together form a fused ring, wherein the fused ring may be optionally substituted; ring B is an aromatic ring with at least one carbon atom coordinated to metal M, wherein ring B can be optionally substituted with one or more substituents at the R 3 , R 4 , and R 6 positions; R 3 , R 4 , and R 6 is each independently selected from the group consisting of H, alkyl, alkenyl, alkynyl, alkylaryl, CN, CO 2 R, C(O)R, NR 2 , OR, halo, aryl, heteroaryl, substituted aryl, substituted heteroaryl or a heterocyclic group; alternatively, R′ 3 and R 6 may be bridged by a group selected from, —CR═CR—, —CR 2 —, —O—, —NR—, —O—CR 2 —, —NR—CR 2 —, and —N═CR—; each R is independently H, alkyl, alkenyl, alkynyl, heteroalkyl, aryl, heteroaryl, or aralkyl; wherein R is optionally substituted by one or more substituents Z; each Z is independently a halogen, R′, OR′, N(R′) 2 , SR′, C(O)R′, C(O)OR′, C(O)N(R′) 2 , CN, SO 2 , SOR′, SO 2 R′, or SO 3 R′; each R′ is independently H, alkyl, alkenyl, alkynyl, heteroalkyl, aryl, or heteroaryl; and wherein R 7 represents one or more optional substitutions located on any position of the phenyl ring attached to ring B, wherein the optional R 7 substitutions are all fluoro or all alkyl.