Metal coordination compound, luminescence device and display apparatus

A metal coordination compound represented by the following formula (6):

• wherein X denotes CRR′, O or S where R and R′ are independently a linear or branched alkyl group of formula:
• CnH2n+1— in which n is an integer of 1-20, the alkyl group can include one or non-neighboring two or more methylene groups that can be replaced with —O— and also can include a hydrogen atom that can be optionally replaced with a fluorine atom;
• R2 denotes a hydrogen atom;
• a fluorine atom;
• a linear or branched alkyl group of formula:
• CnH2n+1— in which n is an integer of 1-20, the alkyl group can include one or non-neighboring two or more methylene groups that can be replaced with —O— and also can include a hydrogen atom that can be optionally replaced with a fluorine atom;
• a phenyl group optionally having a substituent;
• a 9,9-dialkylfluorenyl group (of which the alkyl groups are independently a linear or branched alkyl group of formula:
• CnH2n+1— in which n is an integer of 1-20, the alkyl group can include one or non-neighboring two or more methylene groups that can be replaced with —O— and also can include a hydrogen atom that can be optionally replaced with a fluorine atom);
• a dibenzofuranyl group optionally having a substituent;
• and a dibenzothienyl group optionally having a substituent;
• and R1 and R4 independently denote a hydrogen atom;
• a fluorine atom;
• a phenyl group optionally having a substituent;
• and a linear or branched alkyl group of formula:
• CnH2n+1— in which n is an integer of 1-20, the alkyl group can include one or non-neighboring two or more methylene groups that can be replaced with —O— and also can include a hydrogen atom that can be optionally replaced with a fluorine atom;
• the said optional substituent of said phenyl group, said 9,9-dialkylfluorenyl group, said dibenzofuranyl group and said dibenzothienyl group is a fluorine atom or a linear or branched alkyl group of formula:
• CnH2n+1— in which n is an integer of 1-20, the alkyl group can include one or non-neighboring two or more methylene groups that can be replaced with —O— and also can include a hydrogen atom that can be optionally replaced with a fluorine atom.