Weitkamp Robin F, Neumann Beate, Stammler Hans-Georg, Hoge Berthold
Centrum für Molekulare Materialien, Fakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, 33615, Bielefeld, Germany.
Chemistry. 2021 Jan 13;27(3):915-920. doi: 10.1002/chem.202004236. Epub 2020 Dec 7.
The reaction of a saline phosphazenium hydroxide hydrate with siloxanes led to a novel kind of silanol-silanolate anions. The weakly coordinating behavior of the cation renders the formation of silanol-silanolate hydrogen bonds possible, which otherwise suffer from detrimental silanolate-oxygen cation interactions. We investigated the influence of various weakly coordinating cations on silanol-silanolate motifs, particularly with regard to different cation sizes. While large cations favor the formation of intramolecular hydrogen bonds resulting in cyclic structures, the less bulky tetramethyl ammonium cation encourages the formation of polyanionic silanol-silanolate chains in the solid state.
水合氢氧化磷腈盐与硅氧烷的反应生成了一种新型的硅醇-硅醇盐阴离子。阳离子的弱配位行为使得硅醇-硅醇盐氢键的形成成为可能，否则会受到有害的硅醇盐-氧阳离子相互作用的影响。我们研究了各种弱配位阳离子对硅醇-硅醇盐结构基序的影响，特别是关于不同阳离子大小的影响。虽然大阳离子有利于形成分子内氢键从而导致环状结构，但体积较小的四甲基铵阳离子则促使在固态中形成聚阴离子型的硅醇-硅醇盐链。
