A series of borate-rich metalloborophosphates Na-2[(MB3P2O11)-B-II(OH)]center dot 0.67H(2)O (M-II = Mg, Mn, Fe, Co, Ni, Cu, Zn): Synthesis, structure and magnetic susceptibility

摘要

A series of metalloborophosphates Na-2[(MB3P2O11)-B-II(OH)] center dot 0.67H(2)O (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 P6(3) and form a 3D microporous structure with 12-membered ring channels consisted of octahedral ((MO6)-O-II), 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 degrees C. Completed solid solutions between two different transition metals can also be obtained. Magnetic properties of Na-2[(MB3P2O11)-B-II(OH)]center dot 0.67H(2)O (M-II = Mn, Co, Ni, Cu) have been investigated. (c) 2006 Elsevier Inc. All rights reserved.