Crystal structure of potassium sodium heptahydrogen hexamolybdocobaltate(III) octahydrate: an extra-protonatedB-series Anderson-type heteropolyoxidometalate
2015 ◽
Vol 71
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pp. 1032-1035
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The title compound, KNa[CoIII(OH)7{Mo6O17}]·8H2O, was obtained by the ion-exchange technique from K3[Co(μ3-OH)6Mo6O18]·7H2O. Six μ3-O atoms and one O atom of the bridging μ2-O atom are protonated. This novel polyanion protonated by an extra H atom is an unexpected polyanion species among theB-series Anderson-type polyoxidometalates (POMs), [Xn+(μ3-OH)6Mo6O18](6–n)–] (X= heteroatom). The extra H atom (seventh H atom) in the polyanion does not lie on a crystallographic centre of symmetry, but is located at the mid-point between two μ2-O atoms of adjacent polyanions, and forms a very short hydrogen bond [2.430 (5) Å]. The present structure is considered as particularly significant in understanding noncentrosymmetric strong hydrogen bonding.
2009 ◽
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2015 ◽
Vol 71
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2015 ◽
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2007 ◽
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2006 ◽
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2006 ◽
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