Patent ID: 7094898

Claim:
A compound of the formula Ia or Ib: wherein: M is selected from the group consisting of Ru and Os; R and R 1 are independently selected from the group consisting of hydrogen, C 2 –C 20 alkenyl, C 2 –C 20 alkynyl, C 1 –C 20 alkyl, aryl, C 1 –C 20 carboxylate, C 1 –C 20 alkoxy, C 2–20 alkenyloxy, aryloxy, C 2 –C 20 alkoxycarbonyl, C 1 –C 20 alkylthio, C 1 –C 20 alkylsulfonyl, or C 1 –C 20 alkylsulfinyl; each optionally substituted with one or more C 1 –C 5 alkyl, halogen, C 1 –C 5 alkoxy, phenyl optionally substituted with halogen, C 1 –C 5 alkyl, or C 1 –C 5 alkoxy; X and X 1 are anionic ligands, wherein X and X 1 are each independently selected from -Z-Q, or wherein one of X and X 1 is halide and the other of X and X 1 is -Z-Q, each Z comprising O, S, N, or C, and each Q comprising a planar electron withdrawing group; and L and L 1 are independently selected from any neutral electron donor; wherein any 2–3 of X, X 1 , L, or L 1 are optionally covalently linked to form a chelating multidentate ligand.