Patent ID: 8129554

Claim:
A compound of formula (1) M(L) n (L′) m (L″) o (1) comprising a substructure M(L) n of formula (2) wherein M is a transition metal; A is, identically or differently on each occurrence, NR or O; D is an sp 2 -hybridised carbon atom which bonds to M E is, identically or differently on each occurrence, an sp 2 -hybridised carbon or nitrogen atom; Cy is, identically or differently on each occurrence, a homo- or heterocycle which bonds to M via an sp 2 -hybridised carbon atom and to which one or more groups R are optionally bonded; Y is, identically or differently on each occurrence, CR 2 , C(═O), C(═NR), C(═N—NR 2 ), C(═CR 2 ), SiR 2 , O, S, S(═O), S(═O) 2 , Se, NR, PR, P(═O)R, AsR, As(═O)R, or ; R and R 1 are, identically or differently on each occurrence, H, F, Cl, Br, I, CN, B(OH) 2 , B(OR 2 ) 2 , NO 2 ; a straight-chain alkyl or alkoxy group having up to 40 C atoms, wherein one or more non-adjacent CH 2 groups are optionally replaced by —R 2 C═CR 2 —, —C≡C—, Si(R 2 ) 2 , Ge(R 2 ) 2 , Sn(R 2 ) 2 , —O—, —S—, —NR 2 —, —(C═O)—, —(C═NR 2 )—, —P═O(R 2 )—, or —CONR 2 —, and wherein one or more H atoms are optionally replaced by F, Cl, Br, or I; a branched or cyclic alkyl or alkoxy group having up to 40 C atoms, wherein one or more non-adjacent CH 2 groups are optionally replaced by —R 2 C═CR 2 —, —C≡C—, Si(R 2 ) 2 , Ge(R 2 ) 2 , Sn(R 2 ) 2 , —O—, —S—, —NR 2 —, —(C═O)—, —(C═NR 2 )—, —P═O(R 2 )—, or —CONR 2 —, and wherein one or more H atoms are optionally replaced by F, Cl, Br, or I; or an aromatic or heteroaromatic ring system or an aryloxy or heteroaryloxy group having 5 to 40 C atoms, optionally substituted by one or more non-aromatic radicals R; wherein R optionally defines a further aliphatic or aromatic ring system with Cy; R 2 is, identically or differently on each occurrence, H or an aliphatic or aromatic hydrocarbon radical having up to 20 C atoms, wherein one or more H atoms are optionally replaced by F; and wherein two or more R 2 optionally define a ring system with one another; n is 1, 2 or 3; L′ and L″ are monoanionic, bidentate, chelating ligands; m and o are, identically or differently on each occurrence, 0, 1 or 2; wherein n+m+o=2 for metals with square-planar coordination and wherein n+m+o=3 for metals with octahedral coordination.