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Abstract

The cover picture shows the porous metal-organic polymer [(Cp°2Mo2P4S)CuI)4]n, which is composed of helical substructures with opposite handedness. The compound incorporates CH2Cl2 molecules when it is stored under the solvent. This process is reversible under high vacuum without loss of crystallinity of the material and resembles, therefore, the reversible stretching of an elastic spring. Details of the synthesis and characterization of this and related compounds are given in the article by J. Wachter et al. on p. 785 ff.