Metal salts of benzene-1,2-di(sulfonyl)amine. 7. Lamellar layers based upon hydrogen bonding and pi-stacking: Crystal structures of the metal(II) complexes [Cd{C6H4(SO2)(2)N}(2)(H2O4] and [Cu{C6H4(SO2)(2)N}(2)(H2O)(4)]center dot 2H(2)O

摘要

The title complexes, obtained by treating hot aqueous solutions of ortho-benzenedisulfonimide with solid CdCO3 or CuO, have been characterized by low-temperature X-ray diffraction (both triclinic, space group P (1) over bar, Z = 1, metal ions on inversion centres). The cations have trans-octahedral coordinations provided by two Cd-N bonded or two Cu-O bonded anions and four water molecules [Cd-N 234.7(2) pm; Cu-O(anion) 240.4(1) pm, elongated by Jahn-Teller distortion]; the copper complex contains two further, non-coordinating, water molecules per formula unit. In both structures, the uncharged zero-dimensional building blocks are associated via strong hydrogen bonds O(W)-H...A and one short C-H...O bond to form two-dimensional assemblies comprising an internal polar lamella of metal cations, (SO2)(2)N groups and water molecules, and hydrophobic peripheral regions consisting of vertically protruding benzo rings. Carbocycles drawn alternatingly from adjacent layers form pi-stacking arrays, in which the parallel aromatic rings display intercentroid distances in the range 365-385 pm and vertical ring spacings in the range 345-385 pm. [References: 10]