Patent ID: 7820822

Claim:
A compound of the formula (1) M(L) n (L′) m (L″) 0 (1), wherein a part-structure M(L) n is described by formula (2) wherein the symbols and indices used are: M at each instance is a transition metal ion; Y is the same or different at each instance and is C(R 1 ) 2 , C═O, C═NR 1 , or C═C(R 1 ) 2 ; D is a carbon atom in Cy1 and a nitrogen atom is Cy2; E for each occurrence is C; Cy1 is the same or different at each instance and is a six-membered monocyclic aryl ring 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; Cy2 is the same or different at each instance and is a six-membered heteroaryl ring containing one N atom and 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; Cy3 is the same or different at each instance and is a six-membered monocyclic aryl ring which has a single bond to the Y group and a common edge with the part-cycle Cy2; 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; L′ and L″ are monoanionic, bidentate chelating ligands, and m and o are the same or different at each instance and are 0, 1 or 2.