Zipping in an extra dimension: In the coordination polymer [ZnCl2(μ-bipy)]∞ one-dimensional chains (left) switch into a two-dimensional network (right) in the solid at a surprisingly low temperature of 130 K. At temperatures above 360 K the reverse transformation takes place. The reaction occurs in single crystals as well as in powders. bipy=4,4′-bipyridine.
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Hu et al. (2005) studied this question.
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