Organometallic Complex, and Light-Emitting Element and Light-Emitting Device Using the Organometallic Complex

An organometallic complex including a structure represented by a general formula (2):

• wherein R11 represents an alkyl group having 1 to 4 carbon atoms;
• each of R13 to R15 represents any one of hydrogen, a halogen element, an acyl group, an alkyl group, an alkoxyl group, an aryl group, a cyano group, and a heterocyclic group;
• each of R16 to R19 represents any one of hydrogen, an acyl group, an alkyl group, an alkoxyl group, an aryl group, a heterocyclic group, and an electron withdrawing group;
• and M represents a Group 9 element or a Group 10 element.

An organometallic complex including a structure represented by a general formula (3):

• wherein R21 represents an alkyl group having 1 to 4 carbon atoms;
• each of R22 to R25 represents any one of hydrogen, a halogen element, an acyl group, an alkyl group, an alkoxyl group, an aryl group, a cyano group, and a heterocyclic group;
• Ar represents an aryl group or a heterocyclic group;
• and M represents a Group 9 element or a Group 10 element, in which n=2 when M represents a Group 9 element whereas n=1 when M represents a Group 10 element;
• and L represents a monoanionic ligand having a beta-diketone structure, or a monoanionic bidentate chelate ligand having a carboxyl group, or a monoanionic bidentate chelate ligand having a phenolic hydroxyl group.

An organometallic complex including a structure represented by a general formula (4):

• wherein R31 represents an alkyl group having 1 to 4 carbon atoms;
• each of R32 to R35 represents any one of hydrogen, a halogen element, an acyl group, an alkyl group, an alkoxyl group, an aryl group, a cyano group, and a heterocyclic group;
• each of R36 to R39 represents any one of hydrogen, an acyl group, an alkyl group, an alkoxyl group, an aryl group, a heterocyclic group, and an electron withdrawing group;
• M represents a Group 9 element or a Group 10 element, in which n=2 in the case that M represents a Group element whereas n=1 in the case that M represents a Group 10 element;
• and L represents a monoanionic ligand having a beta-diketone structure, or a monoanionic bidentate chelate ligand having a carboxyl group, or a monoanionic bidentate chelate ligand having a phenolic hydroxyl group.