Tetradentate metal complexes containing indoloacridine and its analogues

A complex of Formula I:

• wherein:
• M is Pt (II), Pd (II), or Au (III),
• each of V, V1, V2, and V3 is independently N, C, P, or Si,
• each of X, X1, X2, and X3 is independently present or absent, and each X, X1, X2, and X3 present independently represents a single bond, CR8R9, C═O, SiR8R9, GeR8R9, NR8, PR8, PR8R9, R8P═O, AsR8, R8As═O, O, S, S═O, SO2, Se, Se═O, SeO2, BR8, BR8R9, AlR8, AlR8R9, R8Bi═O, or BiR8,
• each of Y, Y1 and Y2 is independently CR10, SiR10, GeR10, N, P, P═O, As, As═O, B, Bi═O, or Bi,
• L is a substituted or unsubstituted aryl, heteroaryl, or N-heterocyclic carbene,
• each of R1, R2, R3, R4, R5, R6, and R7 is independently absent or present as a single substituent or multiple substituents, valency permitting, and each R1, R2, R3, R4, R5, R6, and R7 present independently represents 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 R8, R9, and R10 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, 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.