Fullerene-Functionalized Halogen-Bonding Heteroditopic Hosts for Ion-Pair Recognition

被引:3
|
作者
Bak, Krzysztof M. [1 ]
Marques, Igor [2 ]
Kuhn, Heike [1 ]
Christensen, Kirsten E. [1 ]
Felix, Vitor [2 ]
Beer, Paul D. [1 ]
机构
[1] Univ Oxford, Dept Chem, Chem Res Lab, Oxford OX1 3TA, England
[2] Univ Aveiro, CICECO Aveiro Inst Mat, Dept Chem, P-3810193 Aveiro, Portugal
基金
英国工程与自然科学研究理事会;
关键词
BASIS-SETS; ANION; CHEMISTRY; CONSTRUCTION; RECEPTORS; TRANS-1; DESIGN; STATES;
D O I
10.1021/jacs.3c07774
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Despite their hydrophobic surfaces with localized pi-holes and rigid well-defined architectures providing a scaffold for preorganizing binding motifs, fullerenes remain unexplored as potential supramolecular host platforms for the recognition of anions. Herein, we present the first example of the rational design, synthesis, and unique recognition properties of novel fullerene-functionalized halogen-bonding (XB) heteroditopic ion-pair receptors containing cation and anion binding domains spatially separated by C-60. Fullerene spatial separation of the XB donors and the crown ether complexed potassium cation resulted in a rare example of an artificial receptor containing two anion binding sites with opposing preferences for hard and soft halides. Importantly, the incorporation of the C-60 motif into the heteroditopic receptor structure has a significant effect on the halide binding selectivity, which is further amplified upon K+ cation binding. The potassium cation complexed fullerene-based receptors exhibit enhanced selectivity for the soft polarizable iodide ion which is assisted by the C-60 scaffold preorganizing the potent XB-based binding domains, anion-pi interactions, and the exceptional polarizability of the fullerene moiety, as evidenced from DFT calculations. These observations serve to highlight the unique properties of fullerene surfaces for proximal charged guest binding with potential applications in construction of selective molecular sensors and modulating the properties of solar cell devices.
引用
收藏
页码:27367 / 27379
页数:13
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