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Abstract:
Together with the MI ions, the tetrahedral ribbons of the title compounds form double helices, the central channels of which are filled with water helices (see picture). Coordination octahedra MIIO4(H2O)2 link the spiral ribbons, which run parallel to one another. Partial dehydration of the title compounds leads to microporous phases with channeled structure and is reversible in the sense of a topochemical reaction.