A discrete cyclic water heptamer trapped inside a three-dimensional coordination polymer undergoes single-crystal to single-crystal transformation to a new type of water heptamer containing a pentamer ring buttressed by a dimer, accompanied by phase transition below 273 K. The structural differences between the heptamers in BF4− and ClO4− salts have been attributed to the influence of the anions in the channels.
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Mir et al. (2008) studied this question.
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