Tetradentate metal complexes with carbon group bridging ligands

A compound of Formula VI:

• wherein:
• M is Pt, Pd, or Au,
• A is C, Si, or Ge,
• each of L1 and L4 is a substituted or unsubstituted pyridyl group,
• each of L2 and L3 is a substituted or unsubstituted phenyl group,
• each of V1 and V4 is coordinated with M and is independently N or C,
• each of V2 and V3 is coordinated with M and is C,
• each of Y1 and Y2 is independently CH, CR, SiH, SiR, N, P, P═O, As, or As═O,
• RLa and RLb are covalently bonded to form a fused ring, wherein the fused ring formed by RLa and RLb is substituted by one or more of halogen, hydroxyl, thiol, nitro, cyano, nitrile, isonitrile, sulfinyl, mercapto, sulfo, carboxyl, hydrazino;
• substituted or unsubstituted:
• aryl, cycloalkyl, cycloalkenyl, heterocyclyl, heteroaryl, alkyl, alkenyl, alkynyl, amino, monoalkylamino, dialkylamino, monarylamino, diarylamino, alkoxy, aryloxy, haloalkyl, aralkyl, ester, alkoxycarbonyl, acylamino, alkoxycarbonylamino, aryloxycarbonylamino, sulfonylamino, sulfamoyl, carbamoyl, alkylthio, ureido, phosphoramide, silyl, polymeric;
• or any conjugate or combination thereof,
• each of Ra, Rb, Rc, Rd, Re, and Rf is independently present or absent, and if present each of Rb, Rc, Re and Rf independently represents mono-, di-, or tri-substitutions, each of Ra and Rd independently represents mono-, di-, tri-, or tetra-substitutions, and each of Ra, Rb, Rc, Rd, Re and Rf is independently deuterium, halogen, hydroxyl, thiol, nitro, cyano, nitrile, isonitrile, sulfinyl, mercapto, sulfo, carboxyl, hydrazino;
• substituted or unsubstituted:
• aryl, cycloalkyl, cycloalkenyl, heterocyclyl, heteroaryl, alkyl, alkenyl, alkynyl, amino, monoalkylamino, dialkylamino, monoarylamino, diarylamino, alkoxy, aryloxy, haloalkyl, aralkyl, ester, alkoxycarbonyl, acylamino, alkoxycarbonylamino, aryloxycarbonylamino, sulfonylamino, sulfamoyl, carbamoyl, alkylthio, ureido, phosphoramide, silyl, polymeric;
• or any conjugate or combination thereof, and
• R is independently R is hydrogen, deuterium, halogen, hydroxyl, thiol, nitro, cyano, nitrile, isonitrile, sulfinyl, mercapto, sulfo, carboxyl, hydrazino;
• substituted or unsubstituted:
• aryl, cycloalkyl, cycloalkenyl, heterocyclyl, heteroaryl, alkyl, alkenyl, alkynyl, amino, monoalkylamino, dialkylamino, monarylamino, diarylamino, alkoxy, aryloxy, haloalkyl, aralkyl, ester, alkoxycarbonyl, acylamino, alkoxycarbonylamino, aryloxycarbonylamino, sulfonylamino, sulfamoyl, carbamoyl, alkylthio, ureido, phosphoramide, silyl, polymeric;
• or any conjugate or combination thereof.