| abstract |
A compound represented by formula (1): n n n n n n n n n n n n wherein Y 1 to Y 4 each independently represent any one of the following groups: n n n n n nin which R α represents a hydrogen atom or a monovalent hydrocarbon group; P 1 to P 4 each independently represents a group of atoms necessary for forming a heterocyclic ring together with each Y 1 to Y 4 and the two carbon atoms adjacent to Y 1 to Y 4 , respectively; P 5 and P 6 each independently represents a group of atoms necessary for forming a cyclic skeleton together with the carbon atom to which Z 1 bonds or Z 2 bonds; P 1 and P 2 , P 2 and P 6 , P 6 and P 4 , P 4 and P 3 , P 3 and P 5 , and P 5 and P 1 may further combine with each other to form a ring; Q 1 and Q 2 each independently represents a connecting group or a direct binding; and Z 1 and Z 2 each independently represent any one of the following groups;n —NR β 2 , —OR β , —SR β , —PR β 2 n nin which R β represents a hydrogen atom or a monovalent hydrocarbon group, and when plural R β s are present, these plural R β s may be the same or different from each other. |