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

Abstract

A series of 3D heteropolymolybdates, (NH 4) 2{[ M(H 2O) 3] 2[TeMo 6O 24]}·H 2O ( M=Mn( 1), Co( 2), Ni( 3), Cu( 4), and Zn( 5)) and [ Ln(H 2O) 4] 2[TeMo 6O 24]·3H 2O ( 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 [TeMo 6O 24] 6− and transion metal or rare-earth metal cations. Compounds 1– 5 are of highly symmetrical structures with pyrite-like topology in which [TeMo 6O 24] 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 [TeMo 6O 24] 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.