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Hole in one: A metal–organic framework with permanent microporosity has been constructed from linear coordination polymer chains consisting of Ni(cyclam)2+ and bpydc2−. In framework 1 the chains run in three directions (red, green, blue in the picture) and are stacked to form 1D channels that are filled with water molecules, which can be removed completely and reabsorbed with retention of the single crystallinity.
Lee et al. (2004) studied this question.