Synthesis of four coordinated gold complexes and their applications in light emitting devices thereof

A compound represented by the formula:

• wherein each R1 and R2 in (R1)2 and (R2)2 independently represents hydrogen, optionally substituted C1-C4 alkyl, halogen, hydroxyl, amino, nitro, or thiol;
• Y1a represents O, S, NR4a, wherein R4a represents optionally substituted C1-C4 alkyl;
• Si(R4b)2, wherein each R4b in (R4b)2 independently represents optionally substituted C1-C4 alkyl;
• or C(R4c)2, wherein each R4c in (R4c)2 represents hydrogen or optionally substituted C1-C4 alkyl;
• n is an integer 0 or 1;
• Y1b, when present, represents O, S, NR5a, wherein R5a represents optionally substituted C1-C4 alkyl;
• Si(R5b)2, wherein each R5b in (R5b)2 independently represents optionally substituted C1-C4 alkyl;
• or C(R5c)2, wherein each R5c in (R5c)2 represents hydrogen or optionally substituted C1-C4 alkyl;
• each of Y2a, Y2b, Y2c, and Y2d independently represents N, NR6a, or CR6b, wherein each of R6a and R6b independently represents hydrogen, optionally substituted C1-C4 alkyl, halogen, hydroxyl, amino, nitro, or thiol;
• each of Y3a, Y3b, Y3c, Y3d, Y3e, Y4a, Y4b, Y4c, and Y4d independently represents N, O, S, NR6a, CR6b, wherein each of R6a and R6b independently represents hydrogen or optionally substituted C1-C4 alkyl;
• or Z(R6c)2, wherein Z is C or Si, and wherein each R6c in (R6c)2 independently represents hydrogen or optionally substituted C1-C4 alkyl;
• wherein m is an integer 1 or 2;
• wherein the open dotted circle
• indicates partial or full unsaturation of the ring with which it is associated;
• provided that if m is 1, each of Y2a and Y2d is CH and either of Y2b or Y2c is N, then at least one of Y4a, Y4b, Y3a, Y3d is not N;
• and
• provided that if n is 0, m is 2, each of Y2a and Y2d is CH, and either of Y2b or Y2c is N, then at least one of Y3b or Y3c is not N.