Cyclic compound, its metal complex and modified metal complex

摘要

A compound represented by formula (1):; wherein Y¹ to Y⁴ each independently represent any one of the following groups: ; in which R^α represents a hydrogen atom or a monovalent hydrocarbon group; P¹ to P⁴ each independently represents a group of atoms necessary for forming a heterocyclic ring together with each Y¹ to Y⁴ and the two carbon atoms adjacent to Y¹ to Y⁴, respectively; P⁵ and P⁶ each independently represents a group of atoms necessary for forming a cyclic skeleton together with the carbon atom to which Z¹ bonds or Z² bonds; P¹ and P², P² and P⁶, P⁶ and P⁴, P⁴ and P³, P³ and P⁵, and P⁵ and P¹ may further combine with each other to form a ring; Q¹ and Q² each independently represents a connecting group or a direct binding; and Z¹ and Z² each independently represent any one of the following groups;—NR^β₂, —OR^β, —SR^β, —PR^β₂ in which R^β represents a hydrogen atom or a monovalent hydrocarbon group, and when plural R^βs are present, these plural R^βs may be the same or different from each other.