Synthesis of platinum and palladium complexes as narrow-band phosphorescent emitters for full color displays

A complex of the formula:

• wherein:
• M is platinum or palladium,
• Ar1 is a substituted or unsubstituted pyridinyl, isoquinolinyl, quinazolinyl, or imidazolyl ring when M is palladium, and Ar1 is a substituted or unsubstituted pyridinyl, isoquinolinyl, quinazolinyl, imidazolyl pyrazolyl, quinolinyl, triazolyl, benzimidazolyl, benzoxazolyl, or benzothiazolyl ring when M is platinum,
• each of Ar2, Ar3, and Ar4 is independently a substituted or unsubstituted phenyl or pyridyl ring;
• Ar5 is a substituted or unsubstituted phenyl ring,
• Ar6 is a substituted or unsubstituted phenyl ring, or is absent,
• each of X1, X2, X3, and X4 is independently a carbon or nitrogen atom,
• each of A1 and A2 is independently a nitrogen, carbon, boron, phosphorus, or silicon atom, and each of A1 and A2 is independently optionally substituted, and
• each of b1 and b2 is independently present or absent, and if present is an oxygen, sulfur, nitrogen, carbon, boron, phosphorus, or silicon atom.