Platinum complexes and devices

A compound of Formula II2:

• wherein L1 is a five-membered heterocyclyl, heteroaryl, carbene, or N-heterocyclic carbene,
• wherein L2 is phenyl,
• wherein A1 is O, S, S═O, SO2, Se, NR3, PR3, RP═O, CR1R2, C═O, SiR1R2, GeR1R2, BH, P(O)H, PH, NH, CR1H, CH2, SiH2, SiHR1, BH, or BR3,
• wherein V1 is N, V2 is C, V3 is C, and V4 is N,
• wherein each of Y1, Y2, Y3, and Y4 is independently C, N, O, or S,
• wherein X is N,
• wherein each of Rb, R1, R2, and R3 of Formula II2 is independently present or absent and if present, each of Rb, R1, R2, and R3 present represents mono-, di-, or tri-substitutions, and each Rb, R1, R2, and R3 present is independently substituted or unsubstituted aryl, cycloalkyl, cycloalkenyl, heterocyclyl, heteroaryl, alkyl, alkenyl, alkynyl, deuterium, halogen, hydroxyl, thiol, nitro, cyano, amino, a mono- or di-alkylamino, a mono- or diaryl amino, alkoxy, aryloxy, haloalkyl, aralkyl, ester, nitrile, isonitrile, alkoxycarbonyl, acylamino, alkoxycarbonylamino, aryloxycarbonylamino, sulfonylamino, sulfamoyl, carbamoyl, alkylthio, sulfinyl, ureido, phosphoramide, mercapto, sulfo, carboxyl, hydrazino, or substituted silyl, and wherein two or more of Rb are optionally linked together,
• wherein each of R, R1, R2, and R3 of variable A1 is independently hydrogen, aryl, cycloalkyl, cycloalkenyl, heterocyclyl, heteroaryl, alkyl, alkenyl, alkynyl, deuterium, halogen, hydroxyl, thiol, nitro, cyano, amino, a mono- or di-alkylamino, a mono- or diaryl amino, alkoxy, aryloxy, haloalkyl, aralkyl, ester, nitrile, isonitrile, alkoxycarbonyl, acylamino, alkoxycarbonylamino, aryloxycarbonylamino, sulfonylamino, sulfamoyl, carbamoyl, alkylthio, sulfinyl, ureido, phosphoramide, mercapto, sulfo, carboxyl, hydrazino, or substituted silyl, and wherein two or more of R, R1, R2, and R3 are optionally linked together,
• wherein each of
• is independently:
• and
• wherein each of R, R1, and R2 of
• is independently hydrogen, aryl, cycloalkyl, cycloalkenyl, heterocyclyl, heteroaryl, alkyl, alkenyl, alkynyl, deuterium, halogen, hydroxyl, thiol, nitro, cyano, amino, a mono- or di-alkylamino, a mono- or diaryl amino, alkoxy, aryloxy, haloalkyl, aralkyl, ester, nitrile, isonitrile, alkoxycarbonyl, acylamino, alkoxycarbonylamino, aryloxycarbonylamino, sulfonylamino, sulfamoyl, carbamoyl, alkylthio, sulfinyl, ureido, phosphoramide, mercapto, sulfo, carboxyl, hydrazino, or substituted silyl, and wherein two or more of R, R1, R2, and R3 are optionally linked together.