Two 3D supramolecular polymers constructed from an amino acid and a high-nuclear Ln6Cu24 cluster node

The first successful attempt to construct 3D supramolecular frameworks with high-nuclear 3d-4f heterometallic clusters as a node is reported. The self-assembly of Ln(3+), Cu2+ and amino acid in solution leads to the formation of two polymers, 35-nuclear complex {Sm6Cu29} 1 with a primitive cubic net-like structure and 36-nuclear complex {Nd6Cu30} 2 with a face-centred cubic network type structure. Glycine and L-proline, respectively, were used as ligands. It should be noted that 2 has a chiral framework. X-ray structure analyses show that 1 crystallizes in the triclinic P (1) over bar space group (a=19.6451(8), b=20.4682(8), c=20.7046(8) alpha=89.453(1), beta=66.290(1), gamma=68.572(1)degrees, V=7003.0(5) Angstrom(3) and Z = 1) and 2 belongs to the cubic P2(1)3 space group (a=b=c=32.4341(3) Angstrom, V=34119.7(5)Angstrom(3) and Z=4). Both complexes utilize Ln(6)Cu(24) octahedral clusters as nodes and trans-Cu(amino acid)(2) groups as bridges. Electrical conductivity measurements reveal that both polymers behave as semiconductors.