西班牙穆尔西亚大学Jose Berna团队报道了聚酰胺大环连接金属有机骨架对C60的高效包覆。相关研究成果于2021年2月22日发表在《德国应用化学》。

研究人员使用两个羧基功能化的一个柔性苄基酰胺大环制备坚固的铜（II）和锌（II）基金属有机框架的有机配体。这些聚合物在单斜晶系的C2/m空间群中结晶，在一个方向上形成非互穿通道，溶剂可接近体积的46%。与以苄基酰胺大环为连接体的金属有机轮烷骨架不同，这些新型网状材料中没有主线，导致维数降低，以及孔径和动态客体适应性提高。

研究人员研究了富勒烯C60在两个与同一双核团簇相连的大环之间产生的可调节空穴中的掺入，其占据了网络中98%的空穴。评估了这些材料作为载体对不同富勒烯的选择性识别，主要是将较小尺寸的富勒烯衍生物包埋在C60和C70的几种混合物中。

附：英文原文

Title: Effective encapsulation of C60 by metal‐organic frameworks with polyamide macrocyclic linkers

Author: Adrian Saura-Sanmartin, Alberto Martinez-Cuezva, Marta Marin-Luna, Delia Bautista, Jose Berna

Issue&Volume: 2021-02-22

Abstract: A flexible benzylic amide macrocycle, functionalized with two carboxylic acid groups, was employed as the organic ligand for the preparation of robust copper(II)‐ and zinc(II)‐based metal‐organic frameworks. These polymers crystallized in the C2/m space group of the monoclinic crystal system, creating non‐interpenetrated channels in one direction with an extraordinary solvent‐accessible volume of 46%. Unlike metal‐organic rotaxane frameworks having benzylic amide macrocycles as linkers, the absence of the thread in these novel reticular materials causes a decrease of dimensionality and an improvement of pore size and dynamic guest adaptability. We studied the incorporation of fullerene C  60  inside the adjustable pocket generated between two macrocycles connected to the same dinuclear clusters, occupying a remarkable 98% of the cavities inside the network. The use of these materials as hosts for the selective recognition of different fullerenes  was evaluated, mainly encapsulating the smaller size fullerene derivative in several mixtures of C  60  and C  70  .

DOI: 10.1002/anie.202100996

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202100996