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An extraordinarily useful cluster to detail reaction pathways in water might have been obtained in form of [N(CH3)4]10[Ti12Nb6O44], a polyoxometalate with a central cavity. This compound is soluble in a range of solvents and has been characterized by ESI mass spectrometry and X-ray crystallography (see picture; [1]=[Ti12Nb6O44]10−).
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Ohlin et al. (2008) studied this question.
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