Synthesis and properties of cyclic sandwich compounds

被引:27
|
作者
Muenzfeld, Luca [1 ]
Gillhuber, Sebastian [1 ]
Hauser, Adrian [1 ]
Lebedkin, Sergei [2 ]
Haedinger, Pauline [1 ]
Knoefel, Nicolai D. [1 ]
Zovko, Christina [1 ]
Gamer, Michael T. [1 ]
Weigend, Florian [3 ]
Kappes, Manfred M. [2 ,4 ]
Roesky, Peter W. [1 ]
机构
[1] Karlsruhe Inst Technol KIT, Inst Inorgan Chem, Karlsruhe, Germany
[2] Karlsruhe Inst Technol KIT, Inst Nanotechnol, Eggenstein Leopoldshafen, Germany
[3] Philipps Univ Marburg, Dept Chem, Marburg, Germany
[4] Karlsruhe Inst Technol KIT, Inst Phys Chem, Karlsruhe, Germany
关键词
PLUMBOCENE; NANOWIRES; COMPLEXES; POLYMERS;
D O I
10.1038/s41586-023-06192-4
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Cyclic nanometre-scale sandwich complexes assembled from individual building blocks were synthesized. Sandwich complexes, in which a metal ion is pi-coordinated by two planar aromatic organic rings belong to the foundations of organometallic chemistry. They have been successfully used in a wide variety of applications ranging from catalysis, synthesis and electrochemistry to nanotechnology, materials science and medicine(1,2). Extending the sandwich structural motif leads to linear multidecker compounds, in which aromatic organic rings and metal atoms are arranged in an alternating fashion. However, the extension to a cyclic multidecker scaffold is unprecedented. Here we show the design, synthesis and characterization of an isomorphous series of circular sandwich compounds, for which the term 'cyclocenes' is suggested. These cyclocenes consist of 18 repeating units, forming almost ideally circular, closed rings in the solid state, that can be described by the general formula [cyclo-M-II(mu-eta(8):eta(8)-Cot(TIPS))](18) (M = Sr, Sm, Eu; Cot(TIPS) = 1,4-((Pr3Si)-Pr-i)(2)C8H62-). Quantum chemical calculations lead to the conclusion that a unique interplay between the ionic metal-to-ligand bonds, the bulkiness of the ligand system and the energy gain on ring closure, which is crucially influenced by dispersion interactions, facilitate the formation of these cyclic systems. Up to now, only linear one-dimensional multidecker sandwich compounds have been investigated for possible applications such as nanowires(3-10). This textbook example of cyclic sandwich compounds is expected to open the door for further innovations towards new functional organometallic materials.
引用
收藏
页码:92 / +
页数:6
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