...
首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Redox-enhanced hemilability of a tris(tert-butoxy) siloxy ligand at cerium
【24h】

Redox-enhanced hemilability of a tris(tert-butoxy) siloxy ligand at cerium

机译:铈(叔丁氧基)锡氧基配体的氧化还原增强的杆状性

获取原文
获取原文并翻译 | 示例
           

摘要

The stabilizing effect of a tris(tert-butoxy) siloxy ligand on cerium(IV) is revealed by electrochemical and computation methods as well as by targeted redox chemistry. Ceric homoleptic complex Ce[OSi(OtBu)(3)](4) was obtained by the reaction of[Et4N](2)[CeCl6] with NaOSi(OtBu)(3) at ambient temperature in acetonitrile, while cerous ion-separated complex [Ce{OSi(OtBu)(3)}(4)][K(2.2.2-crypt)] was readily synthesized from [Ce{OSi(OtBu)(3)}(4)K] and cryptand. The solid-state structures of monocerium complexes Ce[OSi(OtBu) 3] 4 and Ce[OSi(OtBu)(3)](4)(THF) show 5- and 6-coordinate Ce-IV centers (one kappa(2)-bonded siloxy ligand), while complex [Ce{OSi(OtBu)(3)}(4)][K(2.2.2-crypt)] exhibits a 4-coordinate Ce-III center (all-terminal siloxy coordination). A comparative electrochemical study of Ce[OSi(OtBu)(3)](4) and [Ce{OSi(OtBu)(3)}(4)][K(2.2.2-crypt)] suggests a redox-modulated molecular rearrangement process, featuring oxidation-state dependent formation and release of a Ce center dot center dot center dot OtBu coordination. While the overall stabilization of Ce-IV by the siloxy ligand is evident, significant extra stabilization is gained if the siloxy ligand coordinates in a chelating fashion, which is further supported by DFT calculations. Natural bond orbital (NBO) analysis indicates an enhanced donation of the siloxy ligand electron density into the unfilled Ce-IV 6s, 4f, and 5d orbitals. Ce-IV to Ce-III reduction readily occurs when homoleptic complex Ce[OSi(OtBu)(3)](4) is treated with cobaltocene, affording the separated ion pair [Ce{OSi(OtBu)(3)}(4)][CoCp2], featuring exclusive terminal siloxy bonding in the solid-state, similar to that detected for [Ce{OSi(OtBu)(3)}(4)][K(2.2.2-crypt)].
机译:TRIS(叔丁氧基)硅氧基配体对铈(IV)的稳定作用通过电化学和计算方法揭示以及靶向氧化还原化学。 CER CEREPT CE [OSI(OTBU)(3)](4)通过在乙腈中的环境温度下用钠(OTBU)(3)与Naosi(OTBU)(3)的反应而获得,而浓密的离子分离复杂[CE {OSI(OTBU)(3)}(4)] [k(2.2.2-crypt)]从[CE {OSI(OTBU)(3)}(4)K]和Cryptand中易于合成。单晶配合物的固态结构Ce [OSI(OTBU)3] 4和Ce [OSI(OTBU)(3)](4)(THF)显示5和6坐标CE-IV中心(一kappa(2 )键合的甲硅烷氧基配体),而复杂的[CE {OSI(OtBu)(3)}(4)] - [K(2,2,2-隐窝)]表现出4-坐标的Ce-III中心(所有末端甲硅烷氧基配位) 。 Ce [OSI(OTBU)(3)](4)和[Ce {OSI(OTBU)(3)}(4)] [K(2.2.2-Crypt)]的比较电化学研究表明了氧化还原的分子重新排列过程,具有氧化状态依赖性形成和释放CE中心点中心点中心点OTBU协调。虽然Siloxy配体的CE-IV的整体稳定是明显的,但如果硅氧基配体以螯合方式坐标,则获得显着的稳定化,这是通过DFT计算进一步支持的。天然键(NBO)分析表明硅氧烷配体电子密度增强施加到未填充的CE-IV 6S,4F和5D轨道中。 CE-IV对CE-III减少易于发生当经络复合CE [OSI(OTBU)(3)](4)用钴茂替茂处理,得到分离的离子对[CE {OSI(OTBU)(3)}(4) [CoCP2],具有在固态中的独占末端硅氧基键合,类似于检测到[Ce {OSI(OSI(OTBU)(3)}(4)] [K(2.2.2-Crypt)]。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号