Spin glass behaviour in a 1D mixed molybdenum-vanadium heteropolyoxometalate-bridged coordination polymer

A 1D trimetallic coordination polymer containing mixed molybdenum-vanadium heteropolyoxometalate bridges, {[Ni(phen)(2)(H2O)](2) [Ni(phen)(2)] [(V8Mo6Mo2O40)-Mo-IV-Mo-VI-O-V(PO4)[Ni(phen)(2)(H2O)](2)[(V8Mo6Mo2O40)-Mo-IV-Mo-VI-O-V(PO4)(2)]}.5H(2)O.2EtOH (1) (phen=1,10-phenanthroline, EtOH = ethanol), has been synthesised hydrothermally. An X-ray crystallographic study revealed that I is composed of ID zigzag chains of {[Ni(phen)(2)(H2O)](2)[Ni(phen)(2)][(V8Mo6Mo2O40)-Mo-IV-Mo-VI-O-V(PO4)]}(n)(n+) cations, {[Ni(phen)(2)(H2O)](2) [(V8Mo6Mo2O40)-Mo-IV-Mo-VI-O-V(PO4)(2)]}(-) anions and solvent molecules. Both the cation and the anion in 1 are mixed molybdenum-vanadium heteropolyoxometalates with covalently linked nickel complex fragments. Magnetic investigations of I indicate spin glass behaviour and several magnetic transitions occur at low temperatures (below 20 K). ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004).