Platinum complexes and devices

A compound of Formula I:

• wherein L1 is a five-membered heterocyclyl, heteroaryl, carbene, or N-heterocyclic carbene,
• wherein each of L2, L3, and L4 is independently a substituted or unsubstituted aryl, cycloalkyl, cycloalkenyl, heteroaryl, heterocyclyl, carbene, or N-heterocyclic carbene,
• wherein each of A1 and A2 is independently present or absent and if present is independently O, S, S═O, SO2, Se, NR3, PR1, RP═O, CR1R2, C═O, SiR1R2, GeR1R2, BH, P(O)H, PH, NH, CR1H, CH2, SiH2, SiHR1, BH, or BR3,
• wherein each of V1, V2, V3, and V4 is coordinated with the Pt and is independently N, C, P, B, or Si,
• wherein each of Y1, Y2, Y3, and Y4 is independently C, N, O, or S,
• wherein Ra is present or absent and if present represents mono-, di-, or tri-substitutions, wherein each Ra is independently a 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, amercapto, sulfo, carboxyl, hydrazino, substituted silyl, or polymerizable group, or any conjugate or combination thereof wherein two or more of Ra are optionally linked together,
• wherein Rb is present or absent and if present represents mono-, di-, or tri-substitutions, wherein each Rb 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, amercapto, sulfo, carboxyl, hydrazino, substituted silyl, or polymerizable group, or any conjugate or combination thereof, wherein two or more of Rb are optionally linked together,
• wherein Rc is present or absent and if present represents mono-, di-, or tri-substitutions, wherein each Rc 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, amercapto, sulfo, carboxyl, hydrazino, substituted silyl, or polymerizable group, or any conjugate or combination thereof, wherein two or more of Rc are optionally linked together,
• wherein Rd is present or absent and if present represents mono-, di-, or tri-substitutions, wherein each Rd is independently a 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, amercapto, sulfo, carboxyl, hydrazino, substituted silyl, or polymerizable group, or any conjugate or combination thereof, wherein two or more of Rd are optionally linked together, and
• wherein each of R, R1, R2, and R3 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, amercapto, sulfo, carboxyl, hydrazino, substituted silyl, or polymerizable group, or any conjugate or combination thereof, and wherein two or more of R, R1, R2, and R3 are optionally linked together.