Patent ID: 7399857

Claim:
A process for forming a tris-cyclometallated complex comprising the step of reacting; a) an M(I) complex, wherein M represents Rh or Ir, and said complex comprises at least two ligands and contains at least two alkenyl groups pi-bonded to M, wherein the M(I) complex is represented by Formula (1): [(L 1 ) n M(L 2 ) m ]X (1) wherein: M represents Ir(I) or Rh(I); each L 1 represents an independently selected ligand comprising an alkenyl group and provided that two L 1 groups may join to form a diene or cyclodiene group; each L 2 represents an independently selected Lewis base ligand; n is 2-4; m is 0-2; the sum of m and n is 4; and X represents a counterion with b) a heterocyclic compound capable of forming a organometallic cyclometallated complex.