Synthesis and structure of Pb13Na(μ3-O)(μ3-OH)(BDC)12: A holodirected/hemidirected mixed Pb–Na heterometal coordination polymer with Pb12O20 cage

By using the 1,3-benzenedicarboxylates (1,3-BDC) ligand in the hydrothermal reaction with Pb(NO3)2, we obtained a novel coordination polymer Pb13Na(μ3-O)(μ3-OH)(BDC)12. The Pb atoms and the 1,3-BDC ligands connect to each other and form a 3-D infinite framework which contains a Pb12 icosahedron and an O20 dodecahedron. These two polyhedrons construct a novel Pb12O20 large cage. The high-coordinated Pb atoms in Pb12 cluster have abnormal hemidirected coordination geometries because of the rigidity of the cluster, while the other eight-coordinated Pb atoms have holodirected geometry. Pb13Na(μ3-O)(μ3-OH)(BDC)12 has a similar structure with the M@Pb12 Zintl ion.