Alkali-metal-directed hydrolytic condensation of trifunctional phenylalkoxysilanesстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 24 октября 2016 г.
Аннотация:The alkali-metal-directed hydrolysis of phenyltrialkoxysilanes, PhSi(OR)(3) (R = Me, Et, nBu), was performed under various reaction conditions. The alkali metal ions were used both as templating entities and as structural elements. The crystalline sodium and potassium phenylsiloxanolates (Na-PhS and K-PhS) were obtained in two different molecular compositions based on a cis-tetraphenylcyclotetrasiloxanolate, cis-[PhSi(O)O-](4), or on a cis-triphenyleyclotrisiloxanolate, cis-[PhSi(O)O-](3), anions assembled into a chain or double-layer supramolecular structure through coordination with alkali cations and hydrogen-bonding contacts. Conditions for selective preparation of crystalline Na-PhS or K-PhS of both structural types were identified. The molecular and crystal structures of [(Na+)(3){PhSi(O)O-}(3)](.)8H(2)O (2), [(Na+)(3){PhSi(O)O-}(3)](.)4H(2)O(.)1EtOH (3) and [(K+)(3){PhSi(O)O-}(3)](2)(.)7H(2)O(.)3MeOH (4) were determined by single-crystal X-ray analysis. (C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004.