Polysulfonylamines. CXI. The first x-ray structures of cationic diorganyltin(IV) dichelates [R2Sn(L-L)(2)](2 circle plus) involving bidentate phosphine oxide ligands: Di(methanesulfonyl)amide as a non-coordinating counter-ion

The reaction of Me2Sn(A)(2), where A(circle minus) = (MeSO2)(2)N-circle min us, with DPPOE = ethane-1,2-diylbis(diphenylphosphine oxide) or CDPPOET=cis -ethene-1,2-diylbis-(diphenylphosphine oxide) yields the ionic dichelates [ Me2Sn(dppoe)(2)](2 circle minus).2 A(circle minus) (1; monoclinic, space gr oup P2(1)/c) and [Me2Sn(cdppoet)(2)](2 circle minus).2 A(circle minus) (2; monoclinic, P2(1)/n). A solvated variety of 2, [Me2Sn(cdppoet)(2)](2 circle minus).2 A(circle minus).Et2O.0.15 MeCN (4; triclinic, Pi), was serendipit ously obtained by thermal degradation of the new compound [Me2Sn(A)(mu-OH)] (2). 2 CDPPOET in an MeCN/Et2O medium. The crystals of 1, 2 and 4 consist o f discrete formula units (one independent unit for 1 and 2, two independent units for 4); in the structure of 4, the solvent molecules are located in tice cavities, All the tin atoms lie on crystallographic inversion centres and display moderately distorted octahedral C2O4 coordinations with short S n-O bonds in the range 218-223 pm. Within the formula units, the anions are connected to the P-CPI donor groups of the chelating ligands by C-H ... O/ N interactions, some of which are remarkably short (eg. in 1: H ... O 220 p m, C-H ... O 170 degrees; H ... N 242pm, C-H ... N 153 degrees).