• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >Charge-Separated and Molecular Heterobimetallic Rare Earth–Rare Earth and Alkaline Earth–Rare Earth Aryloxo Complexes Featuring Intramolecular Metal–p-arene Interactions
【24h】

Charge-Separated and Molecular Heterobimetallic Rare Earth–Rare Earth and Alkaline Earth–Rare Earth Aryloxo Complexes Featuring Intramolecular Metal–p-arene Interactions

机译：具有分子内金属-对芳烃相互作用的电荷分离和分子杂双金属稀土-稀土和碱土-稀土芳氧基配合物

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Treatment of a rare earth metal (Ln) and a potential divalent rare earth metal (Ln’) or an alkaline earth metal (Ae) with 2,6-diphenylphenol (HOdpp) at elevated temperatures (200–250 8C) afforded heterobimetallic aryloxo complexes, which were structurally characterised. A charge-separated species [(Ln’/Ae)2ACHTUNGTRENUNG(Odpp)3][Ln- ACHTUNGTRENUNG(Odpp)4] was obtained for a range of metals, demonstrating the similarities between the chemistry of the divalent rare earth metals and the alkaline earth metals. The [(Ln’/Ae)2ACHTUNGTRENUNG(Odpp)3]+ cation in the heterobimetallic structures is unusual in that it consists solely of bridging aryloxide ligands. A molecular heterobimetallic species [AeEu- ACHTUNGTRENUNG(Odpp)4] (Ae=Ca, Sr, Ba) was obtained by treating an alkaline earth metal and Eu metal with HOdpp at elevated temperatures. Similarly, [BaSr- ACHTUNGTRENUNG(Odpp)4] was prepared by treating Ba metal and Sr metal with HOdpp. Treatment of [Ba2ACHTUNGTRENUNG(Odpp)4] with [Mg- ACHTUNGTRENUNG(Odpp)2ACHTUNGTRENUNG(thf)2] in toluene afforded [Ba2ACHTUNGTRENUNG(Odpp)3][MgACHTUNGTRENUNG(Odpp)3ACHTUNGTRENUNG(thf)]. Analogous solution-based syntheses were not possible for [(Ln’/Ae)2ACHTUNGTRENUNG(Odpp)3][Ln- ACHTUNGTRENUNG(Odpp)4] complexes, for which the free-metal route was essential. As a result of the absence of additional donor ligands, the crystal structures of the heterobimetallic complexes feature extensive p-Ph–metal interactions involving the pendant phenyl groups of the Odpp ligands, thus enabling the large electropositive metal atoms to attain coordination saturation. The charge-separated heterobimetallic species were purified by extraction with toluene/thf mixtures at ambient temperature (Ba-containing compounds) or by extraction with toluene under pressure above the boiling point of the solvent (other products). In donor solvents, heterobimetallic complexes other than those containing barium were found to fragment into homo- ACHTUNGTRENUNGmetallic species.
机译：在升高的温度（200–250 8C）下，用2,6-二苯酚（HOdpp）处理稀土金属（Ln）和潜在的二价稀土金属（Ln'）或碱土金属（Ae），得到杂双金属芳氧基，具有结构特征。对于多种金属，获得了电荷分离的物种[（Ln'/ Ae）2ACHTUNGTRENUNG（Odpp）3] [Ln-ACTHUNGTRENUNG（Odpp）4]，这证明了二价稀土金属与碱金属之间的化学相似性土金属。异双金属结构中的[（Ln’/ Ae）2ACHTUNGTRENUNG（Odpp）3] +阳离子与众不同，因为它仅由桥接的芳氧基配体组成。通过在升高的温度下用HOdpp处理碱土金属和Eu金属，获得了分子异双金属物种[AeEu- ACHTUNGTRENUNG（Odpp）4]（Ae = Ca，Sr，Ba）。类似地，通过用HOdpp处理Ba金属和Sr金属来制备[BaSr-ACTHUNGTRENUNG（Odpp）4]。用甲苯中的[Mg-乙酰丙酮（Odpp）2ACHTUNGTRENUNG（thf）2]处理[Ba2ACHTUNGTRENUNG（Odpp）4]，得到的[Ba2ACHTUNGTRENUNG（Odpp）3] [MgACHTUNGTRENUNG（Odpp）3ACHTUNGTRENUNG（thf）]。对于[（Ln’/ Ae）2ACHTUNGTRENUNG（Odpp）3] [Ln-ACTHUNGTRENUNG（Odpp）4]络合物，基于类似溶液的合成是不可能的，对于这些络合物而言，自由金属途径至关重要。由于没有其他供体配体，异双金属配合物的晶体结构具有广泛的p-Ph-金属相互作用，涉及Odpp配体的侧基苯基，因此使大的正电金属原子达到配位饱和。通过在环境温度下用甲苯/ thf混合物（含Ba的化合物）萃取或在高于溶剂沸点的压力下用甲苯萃取来纯化电荷分离的异双金属物质（其他产物）。在供体溶剂中，发现杂二金属配合物（除含钡的杂双金属配合物）会碎裂为同型ACHTUNGTRENUNG金属物质。

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