| abstract |
A ligand represented by the formula (1):n nR 1 R 2 N-Q 1 -X-Q 2 -NR 3 R 4 (1)n nwherein R 1 , R 2 , R 3 and R 4 are each the same or different and represent a group represented by the formula (2):n n nwherein Q 3 is an optionally substituted alkylene group, an optionally substituted cycloalkylene group, an optionally substituted arylene group, or an optionally substituted divalent heterocyclic group, R 5 is an optionally substituted alkyl group, an optionally substituted aryl group or an optionally substituted heterocyclic group and R 6 is a substituent which may coordinate or bind to a metal atom, or R 5 and R 6 , taken together, may form a ring, Q 1 and Q 2 are each the same or different and represent an optionally substituted alkylene group or a single bond, and X is a divalent spacer. |