Heteroleptic osmium complex and method of making the same

摘要

A method of making an osmium(II) complex having Formula I, L 1 -Os-L 2 , wherein L 1 and L 2 are independently a biscarbene tridentate ligand, wherein L 1 and L 2 can be same or different is disclosed. The method includes (a) reacting a precursor of ligand L 1 with an osmium precursor to form an intermediate product, wherein the osmium precursor having the formula OsH x (PR 3 ) y , wherein x is an integer from 2 to 6 and y is an integer from 2 to 5, and R is selected from the group consisting of aryl, alkyl and cycloalkyl; and (b) reacting a precursor of ligand L 2 with said intermediate product.