Metal complexes, methods, and uses thereof

A metal complex represented by one of the following formulas:

• wherein M is gold (III);
• A is an accepting group comprising one or more of the following structures, which can optionally be substituted:
• wherein D is a donor group comprising of one or more of the following structures, which can optionally be substituted:
• wherein C in structure (a) or (b) comprises one or more of the following structures, which can optionally be substituted:
• wherein N in structure (a) or (b) comprises one or more of the following structures, which can optionally be substituted:
• wherein each of a0, a1, and a2 independently is present or absent, and if present, comprises a direct bond and/or linking group comprising one or more of the following:
• wherein b1 and b2 independently is present or absent, and if present, comprises a linking group comprising one or more of the following:
• wherein X is C or N;
• wherein Y is S, PR3, or SiR1R2,
• wherein each of R, R1, R2, and R3 independently is 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, hydrzino, substituted silyl, or polymerizable, or any conjugate or combination thereof, and
• wherein n is a number that satisfies the valency of Y;
• and
• wherein the metal complex has a lowest triplet excited state and a lowest singlet excited state,
• the lowest triplet excited state has a lower energy level than the lowest singlet excited state,
• the lowest triplet excited state is associated with phosphorescence, and
• a transition from the lowest triplet excited state to the lowest singlet excited state yields delayed fluorescence from the lowest singlet excited state.