The succinamate(−1) ligand in 4f-metal chemistry: First example of amide coordination in the double-chain 1D coordination polymer catena-aquatris(succinamato(−1))erbium(III)

Compound [Er(LH)3(H2O)]n, where LH− is the monoanion of succinamic acid, is the first binary metal/LH− complex, the first example of a succinamato metal complex in which amide coordination is realized and the first example of a polymeric LH− complex of any metal. The LH− ligands adopt three different coordination modes and the complex has a double-chain, ladder-like architecture.