Single-crystal structure of coordination polymer [Nd2(C8H5NO4)3·4H2O]∞

The single-crystal structure of the coordination polymer [Nd2(C8H5NO4)3·4H2O] with rhombus-channels is reported in this paper. There are two crystallographically independent Nd(Ⅲ) ions, and each Nd(Ⅲ) ion is in the eight-coordinated environment. Seven of eight oxygen atoms are from six 5-aminoisophthalic acid ligands, the other oxygen atom is given by coordination water. Carboxyl groups link two Nd(Ⅲ) ions using h1,1 and h1,3 modes. Two carboxyl groups from ligands chelate Nd(Ⅲ) ion to form four-mem- bered rings. Crystal data: Triclinic, space group P1, a = 1.03680(5) nm, b = 1.66934(15) nm, c = 0.88221(14) nm, a = 99.754(2), b = 111.169(4), g = 85.400(4). Some ligands linking metal Nd(Ⅲ) ions parallel to ab plane form molecu- lar ladders, and the others linking molecular ladders result in rhombus channels along c-axis. These coordinated water molecules and amino groups are pendent in the channels.