Transformation of a Layered Zinc Phosphite to a Three-Dimensional Open-Framework Structure with Intersecting 16- and 12-Ring Channels

A new layered zinc phosphite, H(2)tmdp x Zn(3)(HPO(3))(4) (tmdp = 4,4'-trimethylenedipiperidine), was prepared in a flux of phosphorous acid without the addition of water as a solvent. The compound could be transformed into a new three-dimensional open-framework zinc phosphite, Zn(2)(H(2)O)(4)(HPO(3))(2) x H(2)O, with intersecting 16- and 12-ring channels at room temperature.