Patent ID: 8663821

Claim:
A multinuclear complex of Formula (I): {-[L] 2 M-B—} n wherein L, being the same or different at each occurrence, is a bidentate ligand, represented by: wherein E 1 represents an aromatic or heteroaromatic ring, optionally condensed with additional aromatic moieties or non aromatic cycles, said ring optionally having one or more substituents and coordinating to metal M via a sp 2 hybridized carbon, optionally forming a condensed structure with a ring comprising E 2 ; and wherein E 2 represents an aromatic or hetero-aromatic ring, optionally condensed with additional aromatic moieties or non aromatic cycles, said ring optionally having one or more substituents and coordinating to metal M via an atom X selected from groups IVa, Va or VIa of the periodic system; M is Ir; B is a 2-connecting short metal bridging ligand bound to said at least two metal atoms, wherein the metal bridging ligand comprises coordinating atoms independently selected from the group of nitrogen, phosphorous, carbon, oxygen, sulfur and selenium in 1,2 or 1,3 mutual position.(1,2-μ or 1,3-μ bonding mode); and n is an integer larger than 1.