Tetradentate metal complexes with carbon group bridging ligands

A compound of Formula II, Formula III, Formula IV, or Formula V:

• wherein:
• M is Pt, Pd, or Au,
• A is C, Si, or Ge,
• L1 is a substituted or an unsubstituted heteroaryl selected from the group consisting of imidazole, pyrazole, or pyridine;
• L4 is substituted or unsubstituted pyridine;
• L2 is substituted or unsubstituted phenyl or pyridinyl;
• L3 is substituted or unsubstituted phenyl or pyridinyl;
• V1 is N or C;
• V2 and V3 are C;
• V4 is N;
• Y is CH, CR1, SiH, SiR1, GeH, GeR1, N, P, P═O, As, As═O, B, Bi, Bi═O,
• Z is CH2, CR1R2, C═O, SiR1R2, GeH2, GeR1R2, NH, NR3, PH, PR3, R3P═O, AsR3, R3As═O, O, S, S═O, SO2, Se, Se═O, SeO2, BH, BR3, R3Bi═O, BiH, or BiR3,
• each of RLa and RLb is independently 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, and RLa and RLb are optionally joined to form a fused ring, and
• each of Ra, Rb, Rc, Rd, and Re is independently present or absent, and if present each of Ra, Rb, Rc, Rd, and Re independently represents mono-, di-, or tri-substitutions, and wherein each of Ra, Rb, Rc, Rd and Re 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
• each of R1, R2, and R3 is independently 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.