首页> 外文期刊>Crystal growth & design >Homochiral, Helical Coordination Complexes of Lanthanides(III) and Mixed-Metal Lanthanides(III): Impact of the 1,8-Naphthalimide Supramolecular Tecton on Structure, Magnetic Properties, and Luminescence
【24h】

Homochiral, Helical Coordination Complexes of Lanthanides(III) and Mixed-Metal Lanthanides(III): Impact of the 1,8-Naphthalimide Supramolecular Tecton on Structure, Magnetic Properties, and Luminescence

机译:镧系元素(III)和混合金属镧系元素(III)的手性,螺旋配位络合物:1,8-萘二甲酰亚胺超分子构造对结构,磁性和发光的影响

获取原文
获取原文并翻译 | 示例
           

摘要

The reactions of the lithium salt of (S)-2-(1,8-naphthalimido)-3-hydroxypropanoate (L-ser(-)), an enantiopure carboxylate ligand containing a 1,8-naphthalimide pi center dot center dot center dot pi stacking supramolecular tecton and an alcohol functional group, with La(NO3)(3), Ce (NO3)(3), SmCl3, Eu(NO3)(3), Gd(NO3)(3), Tb(NO3)(3), and Dy(NO3)(3) under solvothermal conditions (water/ethanol) produced single crystals (characterized by single-crystal X-ray crystallography) of [La-3(L-ser)(8)-(OH)(H2O)]center dot(H2O,EtOH)(x) (1), [Ce-3 (L-ser)(8)(OH)(H2O)]center dot(H2O,EtOH)(x) (2), [Sm-3(L-ser)(8)(OEt)]center dot(H2O,EtOH)(x) (3), [Eu-3(L-ser)(8) (OEt)]center dot(H2O,EtOH)(x) (4), [Gd-3(L-ser)(8)(OEt)]center dot(H2O,EtOH)(x) (5), [Tb-3 (L-ser)(8)(OEt)]center dot(H2O,EtOH)(x) (6), and [Dy-3(L-ser)(8)(OEt)]center dot(H2O,EtOH)(x) (7), respectively. Mixed-metal complexes [Ce2.3Tb0.7(L-ser)(8)(OH)]center dot(H2O,EtOH)(x) (8), [Gd0.4Tb2.6(L-ser)(8)(OEt)]center dot(H2O,EtOH)(x) (9), and [Ce1.4Gd0.3Tb1.3(L-ser)(8)(OH)]center dot(H2O,EtOH)(x) (10) were prepared by using two or more types of lanthanides in the solvothermal reactions (additional mixed-metal complexes were prepared and characterized by ICP-MS). Single crystals of compounds 1-10 are isostructural: trinuclear, carboxylate-bonded helicates organized by the non-covalent, pi center dot center dot center dot pi stacking interactions of the 1,8-naphthalimide groups into intertwined M helices, with a pitch of 56 angstrom, that are further arranged into a three-dimensional supramolecular framework by additional pi center dot center dot center dot pi stacking interactions. Magnetic measurements of several compounds were as expected for the metal(s) present, indicating no significant interactions between metals within the helicates. The Ce complex 2 showed weak antiferromagnetic ordering below 50 K. All of the complexes, with the exception of 2, showed luminescence based on the 1,8-naphthalimide group. Complex 2 has no emission, and complexes with mixed Ce/Tb ratios showed significant quenching of the naphthalimide-based luminescence, as quantitated with solid-state, absolute quantum yield measurements of these mixed-metal and the pure metal complexes. Lanthanide-based luminescence was only observed for the Eu complex 4.
机译:(S)-2-(1,8-萘二甲酰亚胺)-3-羟基丙酸酯(L-ser(-))的锂盐的反应,这是一种对映体纯的含1,8-萘二甲酰亚胺的羧酸盐配体pi中心中心中心点pi堆叠的超分子构造和一个带有La(NO3)(3),Ce(NO3)(3),SmCl3,Eu(NO3)(3),Gd(NO3)(3),Tb(NO3)的醇官能团(3)和Dy(NO3)(3)在溶剂热条件下(水/乙醇)制得[La-3(L-ser)(8)-(OH)的单晶(通过单晶X射线晶体学表征) )(H2O)]中心点(H2O,EtOH)(x)(2)(1),[Ce-3(L-ser)(8)(OH)(H2O)]中心点(H2O,EtOH)(x)(2) ),[Sm-3(L-ser)(8)(OEt)]中心点(H2O,EtOH)(x)(3),[Eu-3(L-ser)(8)(OEt)]中心点(H2O,EtOH)(x)(4),[Gd-3(L-ser)(8)(OEt)]中心点(H2O,EtOH)(x)(5),[Tb-3(L-ser )(8)(OEt)]中心点(H2O,EtOH)(x)(6)和[Dy-3(L-ser)(8)(OEt)]中心点(H2O,EtOH)(x)( 7)。混合金属配合物[Ce2.3Tb0.7(L-ser)(8)(OH)]中心点(H2O,EtOH)(x)(8),[Gd0.4Tb2.6(L-ser)(8) (OEt)]中心点(H2O,EtOH)(x)(9)和[Ce1.4Gd0.3Tb1.3(L-ser)(8)(OH)]中心点(H2O,EtOH)(x)( 10)通过在溶剂热反应中使用两种或多种镧系元素制备(制备了其他混合金属配合物,并通过ICP-MS表征)。化合物1-10的单晶是等结构的:三核,羧酸盐键合的螺旋结构,由1,8-萘二甲酰亚胺基团的非共价pi中心点中心点中心点pi堆积为相互缠绕的M螺旋,相互堆叠56埃,通过附加的π中心点中心点中心点pi堆叠相互作用进一步排列成三维超分子框架。几种化合物的磁性测量均与存在的金属预期的一样,表明在螺旋体中金属之间没有明显的相互作用。 Ce络合物2在50 K以下显示弱的反铁磁有序性。除2以外,所有络合物均显示基于1,8-萘二甲酰亚胺基团的发光。配合物2没有发射,并且具有混合Ce / Tb比的配合物显示出对萘二甲酰亚胺基发光的显着猝灭,如通过对这些混合金属和纯金属配合物的固态,绝对量子产率测量所定量的。仅基于Eu络合物4观察到基于镧系元素的发光。

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