Xihao Tang's research while affiliated with Central China Normal University and other places
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Publications (12)
Tuning the topology of two‐dimensional (2D) covalent organic frameworks (COFs) is of paramount scientific interest but remains largely unexplored. Herein, we present a site‐selective synthetic strategy that enables the tuning of 2D COF topology by simply adjusting the molar ratio of an amine‐functionalized dihydrazide monomer (NH2−Ah) and 4,4′,4′′‐...
The development of chiral covalent organic frameworks (COFs) by postsynthetic modification is challenging due to the common occurrences of racemization and crystallinity decrement under harsh modification conditions. Herein, we employ an effective site-selective synthetic strategy for the fabrication of an amine-functionalized hydrazone-linked COF,...
Despite significant progress on the design and synthesis of covalent organic frameworks (COFs), precise control over microstructures of such materials remains challenging. Herein, two chiral COFs with well‐defined one‐handed double‐helical nanofibrous morphologies were constructed via an unprecedented template‐free method, capitalizing on the diast...
The development of new techniques for the detection of microRNAs (miRNAs) is highly desirable. Herein, a new crystalline three-component covalent organic framework (COF) termed EB-TAPB-TFP COF was synthesized under solvothermal conditions utilizing 1,3,5-triformylphloroglucinol, 1,3,5-tris(4-aminophenyl)benzene and ethidium bromide as monomers. Int...
Despite significant progress on the design and synthesis of covalent organic frameworks (COFs), precise control over microstructures of such materials remains challenging. Herein, two chiral COFs with well‐defined one‐handed double‐helical nanofibrous morphologies were constructed via an unprecedented template‐free method, capitalizing on the diaste...
The development of new dual-functional materials for detection and removal of heavy metal ions is of great significance in environmental protection. Herein, a new amine-functionalized β-ketoenamine-linked covalent organic framework (termed as NH2–Th-Tfp COF) containing rich O,N,O′-chelating sites and free amine groups has been synthesized through t...
The designed synthesis of chiral covalent organic frameworks (COFs) featuring intriguing properties is fairly scant and remains a daunting synthetic challenge. Here we develop a de novo synthesis of an enantiomeric pair of 2D hydroxyl-functionalized hydrazone-linked chiral COFs, (S)- and (R)-HthBta-OH COFs, using enantiopure 2,5-bis(2-hydroxypropox...
Citations
... Consequently, numerous COF adsorbents with ultrahigh adsorption capability (up to 10.21 g g − 1 ), rapid kinetics, processable forms (e.g., aerogel), and superb recyclability have been constructed [11][12][13][14][15][16][17][18]. In comparison to amorphous adsorbents, COFs offer atomically precise and functionally amenable pore surfaces, which can be ingeniously designed through the judicious selection of organic building blocks or post-synthetic modification of existing COFs [19,20]. This precise tunability of COF pore surfaces permits the establishment of clear structure-function relationships and subtle modulation of their functions [21]. ...
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... This approach is simple to execute and yields targeted COFs in a single reaction step. [35,44,45] It leverages the different reactivities of amine and hydrazide with aldehyde to produce amine-functionalized 2D COFs, exclusively giving rise to honeycomb-like COFs to date. ...
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... In particular, some high-use dyes, such as CR, methyl blue (MBE), rhodamine B (Rh B), and methylene blue (MB), have more stable, nonbiodegradable, aromatic molecular structures that pose a serious threat to the environment [3]. Thus, the development of efficient and sustainable technology for dye wastewater treatment is very urgent [4,5]. Among the various technologies utilized until now, the heterogeneous Fenton reaction is regarded as an efficient and promising approach. ...
... Recently, in an interesting cascade reaction, a pyrrolidine-containing dihydrazine building block was condensed with a trialdehyde compound to give a hydrazone COF. (Scheme 4C) [62]. By scanning electron microscopy, these COFs were found to assemble as double helical structures, whereas no such arrangement was found for the racemic control compound. ...
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... Helicity is ubiquitous in nature, but rarely reported in the POPs field. Recently, Cai, Zhang, and Liu reported the design and assembly of COFs with one-handed double-helical fibrous morphologies [269] ( Fig. 26 a) . The rod like morphologies were first assembled by a cyclic aminal linkage formation. ...
... 61 Xie et al. designed a covalent-organic framework nanosheet-based QCM sensor to detect miRNA but in this case the nanosheet was simply employed to enhance signal generation in a complex probe DNA system. 62 One major advantage of a QCM sensor is its sensitivity: detectable changes in adsorbed mass are of the order of one nanogram per cm 2 . The simplest model relating ∆f to m is the Sauerbrey equation, 63 which is used to calculate the mass of the adsorbate. ...
... This approach is simple to execute and yields targeted COFs in a single reaction step. [35,44,45] It leverages the different reactivities of amine and hydrazide with aldehyde to produce amine-functionalized 2D COFs, exclusively giving rise to honeycomb-like COFs to date. ...
