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)

Two new 1D lanthanide(III) coordination polymers are reported which feature succinamate(−1) ligands (LH−) that exhibit three different coordination modes. Compound image (1), which has been structurally characterized by single-crystal X-ray crystallography, is the first binary metal/LH− complex, the first example of a succinamato(−1) metal complex in which amide coordination of LH− is realized and the first example of a polymeric LH− complex of any metal. The erbium(III) compound and its holmium(III) analog 2 have been studied by a variety of physical and spectroscopic techniques.