Disclosed are a compound represented by general formula (1) or a salt thereof, and a metal complex of the compound or salt (In the formula, A1 represents a chelate group R1 represents a hydrogen atom, etc. R2 represents a hydrogen atom, etc. Z1, Z2, Z3, Z4, and Z5 may be the same or different from one another, and each represent a nitrogen atom, CR3 (wherein R3 represents a hydrogen atom, an optionally-substituted C1-6 alkyl group, etc.), etc. L1 represents a group represented by general formula (3) (wherein R13, R14, R15, and R16 may be the same or different from one another, and each represent a hydrogen atom, etc.) L2 represents an optionally-substituted C1-6 alkylene group and L3 represents an optionally-substituted C1-6 alkylene group.)
