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Crystal Structures of Hydrazinium(II) Salts of [SbF 6] and [Sb2F11] -. -Compounds (III) (yield given in g) and (IV) are synthesized in anhydrous HF and their crystal structures are determined by single crystal XRD. (III) crystallizes in the triclinic space group P1 with Z = 2. The structure is composed of [N2H6] 2+ cations and [Sb 2F11] groups. In disagreement with previous reports based on powder XRD, (IV) crystallizes in the monoclinic space group C2/c with Z = 8. The structure consists of [N 2H6] 2+ cations and [SbF6]anions held together by hydrogen bonds. -(MAZEJ*

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In this review an exhaustive crystallochemical analysis of copper(I) π-complexes with allyl derivatives of heterocyclic compounds has been performed. Structural genesis of inorganic constituents starting from the simplest units to the most complicated aggregates was considered taking into account the specific role of Cu-(C=C) interaction, the construction of the organic ligands, the basicity and nucleophilic activity of their heteroatoms, as well as olefin Cu(I) π-complex preparation route.

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