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A layered coordination polymer (LCP) named UZAR-S12 was synthesized. Its structure and formula [Zn2(m2mMP)3(NO3)(DMF)(H2O)]n$nDMF (mMP, 6-(methylmercapto)purinate; DMF, N,N-dimethylformamide) were determined by single crystal X-ray diffraction. UZAR-S12 is characterized by two kinds of Zn centres. Zn1 is bonded to threemMP ligands at the basal plane, and one watermolecule and one DMFmolecule at the axial positions, giving rise to a slightly distorted trigonal bipyramidal geometry. Zn2 is coordinated to three mMP linkers and one NO3 resulting in a tetrahedral environment. The layers are arranged yielding a threedimensional network with guest DMF trapped between them. Lattice and coordination DMF can be replaced reversibly by other solvents producing a contraction (methanol) or an expansion (N,Ndiethylformamide) of the framework. A solvent exchange method was used from the vapour phase which preserved the sample crystallinity.

Synthesis, structure and characterization of a layered coordination polymer based on Zn(ii) and 6-(methylmercapto)purine