Please use this identifier to cite or link to this item: https://doi.org/10.1021/acs.chemmater.8b03685
Title: Restriction of Molecular Rotors in Ultrathin Two-Dimensional Covalent Organic Framework Nanosheets for Sensing Signal Amplification
Authors: DONG JINQIAO 
LI XU 
PEH SHING BO 
Yuan, Yi Di
WANG YUXIANG 
JI DONGXIAO 
PENG SHENGJIE 
LIU GUOLIANG 
Ying, Shaoming
Yuan, Daqiang
JIANG JIANWEN 
SEERAM RAMAKRISHNA 
Zhao Dan 
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Materials Science, Multidisciplinary
Chemistry
Materials Science
AGGREGATION-INDUCED EMISSION
TURN-ON FLUORESCENCE
3 DIFFERENT KINDS
ENANTIOSELECTIVE RECOGNITION
ENERGY MIGRATION
CONSTRUCTION
CRYSTALLINE
STABILITY
PLATFORM
PORES
Issue Date: 8-Jan-2019
Publisher: AMER CHEMICAL SOC
Citation: DONG JINQIAO, LI XU, PEH SHING BO, Yuan, Yi Di, WANG YUXIANG, JI DONGXIAO, PENG SHENGJIE, LIU GUOLIANG, Ying, Shaoming, Yuan, Daqiang, JIANG JIANWEN, SEERAM RAMAKRISHNA, Zhao Dan (2019-01-08). Restriction of Molecular Rotors in Ultrathin Two-Dimensional Covalent Organic Framework Nanosheets for Sensing Signal Amplification. CHEMISTRY OF MATERIALS 31 (1) : 146-160. ScholarBank@NUS Repository. https://doi.org/10.1021/acs.chemmater.8b03685
Abstract: © 2018 American Chemical Society. Covalent organic frameworks (COFs) have emerged as promising crystalline porous materials with well-defined structures, high porosity, tunable topology, and functionalities suitable for various applications. However, studies of few-layered ultrathin two-dimensional (2D) COF nanosheets, which may lead to unprecedented properties and applications, are still limited. Herein, we report the targeted synthesis of three azine-linked and imine-linked 2D COFs named NUS 30-32 using monomers containing aggregation-induced emission (AIE) rotor-active tetraphenylethylene (TPE) moieties, affording micro- and meso-dual pores in NUS-30 and NUS-32 and triple pores in NUS-31. For the first time, we demonstrate that these isostructural bulk COF powders can be exfoliated into ultrathin 2D nanosheets (2-4 nm thickness) by a temperature-swing gas exfoliation approach. Compared with TPE monomers and COF model compounds, the AIE characteristic of NUS 30-32 nanosheets is distinctly suppressed because of the covalent restriction of the AIE molecular rotors in the confined 2D frameworks. As a result, the enhancement of conjugated conformations of NUS 30-32 nanosheets with unusual structure relaxation shows signal amplification effect in biomolecular recognition of amino acids and small pharmaceutical molecules (l-dopa), exhibiting much higher sensitivity than their stacked bulk powders, TPE monomer, and COF model compound. Moreover, the binding affinity of the COF nanosheets toward amino acids can be controlled by increasing the number of azine moieties in the structure. Density functional theory calculations reveal that binding affinity control results from the crucial geometric roles and stronger host-guest binding between azine moieties and amino acids. In addition, we demonstrate that minimal loading of the NUS-30 nanosheets in composite membranes can afford excellent performance for biomolecule detection. Our findings pave a way for the development of functional ultrathin 2D COF nanosheets with precise control over the nature, density, and arrangement of the binding active sites involved in enhanced molecule recognition.
Source Title: CHEMISTRY OF MATERIALS
URI: https://scholarbank.nus.edu.sg/handle/10635/169835
ISSN: 0897-4756
1520-5002
DOI: 10.1021/acs.chemmater.8b03685
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