Hydrothermal assembly of (3,6)-connected networks with classical mineral structures constructed from Anderson-type heteropolymolybdate and metal cations

A series of 3D heteropolymolybdates, (NH4)(2){[M(H2O)(3)](2)[TeMo6O24]}center dot H2O (M = Mn(1), Co(2), Ni(3), Cu(4), and Zn(5)) and [Ln(H2O)(4)](2)[TeMo6O24]center dot 3H(2)O (Ln = La(6), Ce(7), and Nd(8)), has been isolated from hydrothermal reactions and characterized by elemental analyses, IR spectra, X-ray crystallography and magnetic properties. Single-crystal X-ray diffraction analysis reveals that compounds 1-8 possess unusual (3,6)-connected networks constructed from Anderson-type anions [TeMo6O24](6-) and transion metal or rare-earth metal cations. Compounds 1-5 are of highly symmetrical structures with pyrite-like topology in which [TeMo6O24](6-) anions act as 6-connected sites and transition metal cations act as 3-connected sites. Compounds 6-8 crystallize in symmetrical space groups lower than that of 1 5 exhibiting rutile-like topology with [TeMo6O24](6-) anions acting as 6-connected sites and rare-earth metal cations acting as 3-connected sites. The magnetic properties of 1-4 are also presented. (c) 2006 Elsevier Inc. All rights reserved.