当前位置:科学网首页 > 小柯机器人 >详情
手性金属-有机框架的单晶超薄二维多孔纳米片
作者:小柯机器人 发布时间:2021/2/27 23:44:49

上海交通大学崔勇团队研究开发出了一种手性金属-有机框架的单晶超薄2D多孔纳米片。 相关研究成果发表在2021年2月23日出版的国际学术期刊《美国化学会杂志》。

具有高度有序的平面内纳米孔的二维(2D)材料在许多领域有着重要的应用,但其合理的合成和局部结构表征仍然是两大挑战。

研究发现具有固有孔隙率的单晶超薄2D-MOF纳米片(MONs)可以通过剥落层状金属-有机框架(MOsF)来制备,其层由空间体积庞大的基团稳定。结果表明,通过将金属离子与手性1,1′-联苯磷酸衍生的具有侧链均三甲苯基的角二羧酸连接体配位,构建了具有多孔层结构的三维等结构镧系MOFs。Eu-MOF易于超声剥离成厚度约为6.0nm(2层)、横向尺寸为1.5×3.0μm2的单晶纳米片。

通过low-dose高分辨透射电子显微镜(HRTEM)技术,可以清楚地显示骨架中的孔隙通道以及单个有机和无机构筑单元等详细结构信息。得益于它们的超薄特性,纳米片很好地嵌入聚合物基体中,形成独立的混合基体膜。在溶液相和膜相中,通过与非配位手性磷酸的超分子相互作用,共有17种手性萜烯和萜类化合物有效地猝灭了MONs的荧光,形成了一种用于检测蒸汽对映体的手性光学传感器,这是最具挑战性的分子识别任务之一。

附:英文原文

Title: Single-Crystalline Ultrathin 2D Porous Nanosheets of Chiral Metal–Organic Frameworks

Author: Yuhao Liu, Lingmei Liu, Xu Chen, Yan Liu, Yu Han, Yong Cui

Issue&Volume: February 23, 2021

Abstract: Two-dimensional (2D) materials with highly ordered in-plane nanopores are crucial for numerous applications, but their rational synthesis and local structural characterization remain two grand challenges. We illustrate here that single-crystalline ultrathin 2D MOF nanosheets (MONs) with intrinsic porosity can be prepared by exfoliating layered metal–organic frameworks (MOFs), whose layers are stabilized by sterically bulky groups. As a result, three three-dimensional (3D) isostructural lanthanide MOFs possessing porous layer structures are constructed by coordinating metal ions with an angular dicarboxylate linker derived from chiral 1,1′-biphenyl phosphoric acid with pendant mesityl groups. The Eu-MOF is readily ultrasonic exfoliated into single-crystalline nanosheets with a thickness of ca. 6.0 nm (2 layers) and a lateral size of 1.5 × 3.0 μm2. The detailed structural information, i.e., the pore channels and individual organic and inorganic building units in the framework, is clearly visualized by a low-dose high-resolution transmission electron microscopy (HRTEM) technique. Benefiting from their ultrathin feature, the nanosheets are well embedded into the polymer matrix to form free-standing mixed-matrix membranes. In both the solution and membrane phase, the fluorescence of the MONs can be effectively quenched by a total of 17 chiral terpenes and terpenoids through supramolecular interactions with uncoordinated chiral phosphoric acids, leading to a chiral optical sensor for detecting vapor enantiomers, which is among the most challenging molecular recognition tasks.

DOI: 10.1021/jacs.0c13005

Source: https://pubs.acs.org/doi/10.1021/jacs.0c13005

 

期刊信息

JACS:《美国化学会志》,创刊于1879年。隶属于美国化学会,最新IF:14.612
官方网址:https://pubs.acs.org/journal/jacsat
投稿链接:https://acsparagonplus.acs.org/psweb/loginForm?code=1000