A novel cobalt(II)-molybdenum(V) phosphate organic-inorganic hybrid polymer

摘要

A new organic-inorganic hybrid cobalt(II)-molybdenum(V) phosphate polymer incorporating piperazine (pip). (H(2)pip)(3)[Co3Mo12O24(OH)(6)(PO4)(8)(H(1.5)pip)(4)]center dot 5(H2O), was prepared under hydrothermal conditions. As revealed by single-crystal X-ray diffraction studies. the material is modular. built front a secondary building block composed of two anionic hexameric polyoxomolybdophosphate [Mo6O12(OH)(3)(PO4)(4)](9-) moieties, bridged by a central octahedral Co2+ centre. The sandwich-type dimers are connected via tetrahedral Co2+ metal centres, forming, an infinite one-dimensional polymer. The compound constitutes the first example of a reduced sandwich-type cobalt-molybdenum phosphate in which the organic moiety (pip) is effectively coordinated to the inorganic backbone of the polymer, in this case via the tetrahedrally coordinated Co2+ centres. The magnetic behaviour Of this material was investigated in the temperature range 4-298 K. (C) 2006 Elsevier Inc. All rights reserved.