(mu-Tri-tert-butoxysilanethiolato)bis(tetrahydrofuran)lithium(I) and catena-polybis(mu-tri-tert-butoxysilanethiolato)dilithium(I)-mu-di-methoxyethanel: solvent coordination as the structure-forming factor

摘要

The title compounds, mu-(tri-tert-butoxysilanethiolato-kappa(2) S: S)bis[( tetrahydrofuran-kappa O) lithium( I)], [Li-2(C12H27O3SSi)(2)( C4H8O)(2)], ( I), and catena-poly[[bis(mu-tri-tert-butoxysilanethiolato)1: 2 kappa(2) S; 1 kappa S: 2 kappa S, O-dilithium( I)]-mu-dimethoxyethane-kappa(2) O: O'], [Li-2(C12H27O3SSi)(2)(C4H10O2)](n), ( II), were obtained by the reaction of tri- tert-butoxysilanethiol with metallic lithium. The crude product, when recrystallized from tetrahydrofuran (THF) yields ( I), and when recrystallized from 1,2-dimethoxyethane (DME) gives ( II). Compound ( I) forms centrosymmetric dimers in the solid state with an Li2S2 central core, whereas ( II) forms infinitely long chains, in which the centrosymmetric dimeric units are linked together by the bidentate DME ligand ( also residing on an inversion centre), thus forming a coordination polymer. The formation of a one-dimensional structure in ( II) is a consequence of replacement of a monodentate THF solvent molecule with a bidentate DME molecule.