A series of borate-rich metalloborophosphates Na2[M IIB3P2O11(OH)].0.67H2O (M II=Mg, Mn, Fe, Co, Ni, Cu, Zn): Synthesis, structure and magnetic susceptibility

A series of metalloborophosphates Na2[M IIB3P2O11(OH)].0.67H2O (M II=Mg, Mn, Fe, Co, Ni, Cu, Zn) have been prepared hydrothermally and their structures have been solved by single-crystal diffraction techniques. They all crystallize in a hexagonal space group P63 and form a 3D microporous structure with 12-membered ring channels consisted of octahedral (M IIO6), tetrahedral (BO4, PO4) and triangular (BO2(OH)) units, in which the counter Na+ cations and water molecules are located. The Na+ cations are mobile and can be exchanged by Li+ in a melt of LiNO3. Their open frameworks are thermal stable up to about 500 deg. C. Completed solid solutions between two different transition metals can also be obtained. Magnetic properties of Na2[M IIB3P2O11(OH)].0.67H2O (M II=Mn, Co, Ni, Cu) have been investigated. - Graphical abstract: A series of metalloborophosphates Na2[M IIB3P2O11(OH)].0.67H2O (M II=Mg, Mn, Fe, Co, Ni, Cu, Zn) were synthesized under hydrothermal conditions (473 K). The structure consists of microporous 3D open framework with 12-membered ring channels composed of octahedral (M IIO6), tetrahedral (BO4, PO4) and triangular (BO2(OH)) units