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Caged up: A family of isopolyoxotungstate clusters of the form [H4W19O62]6− with a cluster cage (blue) identical to that of the Dawson-type heteropolyacids (red) has been discovered. These comprise a single trigonal-prismatic or octahedral {WO6}6− moiety in place of the two heteroanions found in the Dawson structure.
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Long et al. (2006) studied this question.
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