Structural characterizations and magnetic properties of three new reduced molybdenum phosphates

Three new molybdophosphates, [Co(dien)(2)] center dot (H(3)dien)(6) center dot {[CoMo12O24(OH)(6)(HPO4)(2)(PO4)(6)][Co(Hdien)](2)[CoMo12O24(OH)(6)(PO4)(8)]} center dot (dien) center dot 4H(3)O center dot 5H(2)O (1), (H(3)dien)(4)[MMo12O24(OH)(6)(HPO4)(4)(PO4)(4)] center dot 10H(2)O [M = Co for (2), Ni for (3); dien = diethylenetriamine], have been synthesized by employing hydrothermal method and characterized by single crystal X-ray diffraction. Compound I is built up of Co[P4Mo6](2) units as the structural motif covalently linked by [Co(Hdien)] complex subunits to yield an unusual 1-D chain. Compounds 2 and 3 are isomorphic and both display covalent discrete M[P4Mo6](2) cluster structures which are linked by the hydrogen bonds to form 3-D supramolecular networks. Both 1 and 2 display antiferromagnetic interaction and these three compounds all exhibit intensive photoluminescence. (c) 2007 Elsevier Inc. All rights reserved.