Two polymorphic forms of a ladder coordination polymer [Zn2(μ-O2C-p-Tol)2(O2C-p-Tol)2(bpe)2] have parallel and criss-cross alignments of the C=C bond pairs. Both polymorphs undergo 100% [2+2] cycloaddition reaction but the one with a parallel orientation of C=C bonds (thermodynamic product) retains its single crystallinity after the reaction.

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http://dx.doi.org/10.1039/c3cc47816eDOI Listing

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