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A New Organic−Inorganic Hybrid Layered Molybdenum(V) Cobalt Phosphate Constructed from [H24(Mo16O32)Co16(PO4)24(OH)4(C5H4N)2(H2O)6]4− Wheels and 4,4′-Bipyridine Linkers

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journal contribution
posted on 07.03.2011, 00:00 by Kai Yu, Bai-Bin Zhou, Yang Yu, Zhan-Hua Su, Guo-Yu Yang
A new layered molybdenum cobalt phosphate, Na2[Co(H2O)6][(Mo16O32)Co16(PO4)4 (HPO4)16(H2PO4)4(OH)4(C10H8N2)4(C5H4N)2(H2O)6]·4H2O (1), has been hydrothermally synthesized and structurally characterized. 1 crystallizes in the monoclinic space group P21/n with a = 15.6825(18) Å, b = 39.503(4) Å, c = 17.2763(17) Å, β = 93.791(2)°, V = 10679.4(18) Å3, and Z = 2. A polyoxoanion of 1 exhibits an unusual organic−inorganic hybrid wheel-type cluster, in which two pyridine ligands link to the surface CoII atoms of a [H24(Mo16O32)Co16(PO4)24(OH)4(H2O)6] (namely, {Mo16Co16P24}) wheel via the Co−N bonds. Furthermore, each {Mo16Co16P24} wheel is connected to four adjacent wheels by four pairs of 4,4′-bipyridine linkers, forming a 2D layered network. The susceptibility measurement shows the existence of dominant antiferromagnetic interactions in 1.