Patent ID: 7820843

Claim:
A chelating carbene complex of the formula: wherein X 1 and X 2 are each, independently, any anionic ligand; L 1 is a neutral electron donor, and wherein any of two or three of X 1 , X 2 , and L 1 may form a multidentate ligand; M is ruthenium or osmium; R 5 , R 6 , R 7 , and R 8 are each, independently, selected from the group consisting of hydrogen, halogen, alkyl, alkenyl, alkynyl, aryl, heteroaryl, alkoxy, alkenyloxy, aryloxy, alkoxycarbonyl, carbonyl, alkylamino, alkylthio, alkylsulfonyl, nitrile, nitro, alkylsulfinyl, trihaloalkyl, perfluoroalkyl, carboxylic acid, ketone, aldehyde, nitrate, isocyanate, hydroxyl, ester, ether, amine, imine, amide, sulfide, disulfide, sulfonate, carbamate, silane, siloxane, phosphine, phosphate, and borate, wherein any two of R 5 , R 6 , R 7 , and R 8 may be independently connected through hydrocarbon or functionalized hydrocarbon groups forming an aliphatic or aromatic ring; Y is a heteroatom selected from oxygen (O), sulfur (S), nitrogen (N), or phosphorus (P); and Z is selected from the group consisting of hydrogen, t-butyl, neopentyl, aryl, functionalized alkyl, and functionalized aryl where the functional group(s) may independently be or more or the following: alkoxy, aryloxy, halogen, carboxylic acid, ketone, aldehyde, nitrate, isocyanate, hydroxyl, ester, ether, amine, imine, amide, sulfide, disulfide, carbamate, silane, siloxane, phosphine, phosphate, and borate.