Patent ID: 8846920

Claim:
A compound of the formula (1) M(L) n (L′) m (L″) 0 Formula (1) containing a part-structure M(L) n of the formula (2) wherein the symbols and indices used are: M at each instance is Mo, W, Re, Ru, Os, Rh, Ir, Pd, Pt or Au; Y is the same or different at each instance and is SiR 1 2 , NR 1 , PR 1 , P(O)R 1 , or O; D is the same or different at each instance and is a carbon atom or a nitrogen atom which coordinates to the metal, with the proviso that one D per ligand is a carbon atom and the other is a nitrogen atom; E is C; Cy1 is the same or different at each instance and is a substituted or unsubstituted 6-membered aryl group which is bonded to the metal M via an atom D and which also has a single bond to the part-cycle Cy2 and a single bond to the Y group, wherein the substituent is R; Cy2 is the same or different at each instance and is a substituted or unsubstituted 6-member heteroaryl group wherein the heteroatom is N, which is bonded via an atom D to the metal M and which also has a single bond to the cycle Cy1 and a common edge with the part-cycle Cy3, wherein the substituent is R; Cy3 is the same or different at each instance and is a substituted or unsubstituted 6-membered aryl group which has a single bond to the Y group and a common edge with the part-cycle Cy2, wherein the substituent is R; R is the same or different at each instance and is H, F, Cl, Br, I, OH, NO 2 , CN, a straight-chain, branched or cyclic alkyl or alkoxy group having from 1 to 20 carbon atoms, where one or more nonadjacent CH 2 groups may be replaced by —R 1 C═CR 1 —, —C≡C—, Si(R 1 ) 2 , Ge(R 1 ) 2 , Sn(R 1 ) 2 , —O—, —S—, —NR 1 —, —(C═O)—, —(C═NR 1 )—, —P═O(R 1 )— or —CONR 1 — and where one or more hydrogen atoms is optionally replaced by F, or an aryl, heteroaryl, aryloxy or heteroaryloxy group which has from 1 to 14 carbon atoms and is optionally substituted by one or more nonaromatic R radicals, where a plurality of substituents R, both on the same ring and on different rings, may in turn form a further mono- or polycyclic, aliphatic or aromatic ring system; R 1 is the same or different at each instance and is H or an aliphatic or aromatic hydrocarbon radical having from 1 to 20 carbon atoms; n is 1, 2 or 3; the ligands L′ and L″ in formula (1) are monoanionic, bidentate chelating ligands, and m and o are the same or different at each instance and are 0, 1 or 2.