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 (H 2 O)] 2 [Ni(phen) 2 ][V IV 8 Mo VI 6 Mo V 2 O 40 (PO 4 )]}{[Ni(phen) 2 (H 2 O)] 2 [V IV 8 Mo VI 6 Mo V 2 O 40 (PO 4 ) 2 ]}·5H 2 O·2EtOH ( 1 ) (phen = 1,10‐phenanthroline, EtOH = ethanol), has been synthesised hydrothermally. An X‐ray crystallographic study revealed that 1 is composed of 1D zigzag chains of {[Ni(phen) 2 (H 2 O)] 2 [Ni(phen) 2 ][V IV 8 Mo VI 6 Mo V 2 O 40 (PO 4 )]} n n + cations, {[Ni(phen) 2 (H 2 O)] 2 [V IV 8 Mo VI 6 Mo V 2 O 40 (PO 4 ) 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 1 indicate spin glass behaviour and several magnetic transitions occur at low temperatures (below 20 K). (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)