Extended architectures based on sandwich-type polyanions and transition metal complex cations

Abstract

Two new compounds based on Weakley-sandwich-type polyanion (WSP), H 2[Mn(en) 2] 2[Mn(en) 2(H 2O)] 2[Mn 4(H 2O) 2(PW 9O 34) 2]·9H 2O ( 1) and Na 2[Co(en) 2] 2[{Co(en) 2(H 2O)] 2[Co 4(H 2O) 2(PW 9O 34) 2]·9H 2O ( 2) (en = ethylenediamine), have been synthesized by the hydrothermal reaction of the trivacant Keggin polyoxoanion [ a- A-PW 9O 34] 9− with transition metal ions and en, and structurally characterized by routine physical methods and single-crystal X-ray diffraction. Compound 1 represents a 1D chain structure made up of WSPs and [Mn(en) 2] 2+ ions. Compound 2 represents a 2D layer structure formed by the interconnection of WSPs, [Co(en) 2] 2+ and Na + ions. Compounds 1 and 2 represent the first example of high-dimensional construction based on WSPs and transition metal complexes (TMCs), in which the water molecules located on the featured tetra-metal unit are still remained, and exhibit the property of sorption/desorption of water molecules.