Patent ID: 6921915

Claim:
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: C n H 2n+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: C n H 2n+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: C n H 2n+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: C n H 2n+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: C n H 2n+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.