Polysulfonylamines. CLII. Crystal structures of metal di(methanesulfonyl) amides. 6. Three layer structures: The isotypic binary compounds M[(MeSO2)(2)N](2) (M = Sr, Pb) and the ethanol solvate Pb[(MeSO2)(2)N](2)center dot EtOH [German]

摘要

Low-temperature X-ray crystal structures are reported for the layer compounds SrA(2) (monoclinic, space group P2(1), Z' = 1), PbA(2) (isotypic and isostructural with SrA(2)), and PbA(2.)EtOH (triclinic, P (1) over bar, Z' = 1), where A(-) denotes the anion obtained by deprotonation of the strong NH acid (MeSO2)(2)NH. The ternary compound appears to be the first crystallographically established ethanol solvate of a lead(II) complex. In the two-dimensional coordination networks, the cations adopt either a distorted cubic or, in the solvate, an irregular (O6N2)-octacoordination, the metal centres of the isotypic structures forming close contacts to two (O,N)-chelating and four kappa(1)O-bonding anions, whereas in the solvate one of the latter ligands is displaced by an EtOH molecule. In the isotypic structures, the Pb-O distances are systematically longer than the Sr-O distances and the Pb-N bonds shorter than the Sr-N bonds, which correlates with the softer character of Pb2+ as compared to Sr2+. The 6s lone pair on Pb2+ is stereochemically inactive in both lead compounds. Analogies and discrepancies between the layer architectures are discussed in detail, including an evaluation of short C-H...O contacts in terms of weak hydrogen bonding. Two complexes of composition PbA(2).2 L, where L is pyridine or 1,10-phenanthroline, have been synthesized and characterized by analytical methods. [References: 32]