872689-79-7Relevant academic research and scientific papers
Metal phthalocyanine-based conjugated microporous polymer/carbon nanotube composites as flexible electrodes for supercapacitors
Mei, Lan,Cui, Xu,Wei, Juncheng,Duan, Qian,Li, Yanhui
, (2021)
Conjugated microporous polymers with active functional groups have attracted more and more attentions in energy conversion systems. However, their low electrical conductivity results in low capacitance, thus limiting their practical application. Herein, conjugated microporous polymer with triphenylamine aldehyde linked to metal phthalocyanines (MNC) is synthesized and then compounded with high-conductivity carbon nanotubes (CNTs) (denoted as CoNCCs) by vacuum filtration. Moreover, CoNCCs exhibit flexibility, which could be served as a self-standing and binder-free flexible electrode of supercapacitors. As a result, the optimized CoNCCs as the flexible electrode show high specific capacitance of 213.4 F g?1 at 0.5 A g?1. In addition, the higher capacity retention rate 85.3% can be retained after 1750 cycles at 20 A g?1. The good electrochemical properties can be attributed to the synergistic effect and strong dual-phase interaction between MNC and CNTs. This work opens the way to develop high-performance and low environmental footprint organic electrode materials for SCs.
Reticular Synthesis of tbo Topology Covalent Organic Frameworks
Kang, Xing,Han, Xing,Yuan, Chen,Cheng, Cheng,Liu, Yan,Cui, Yong
supporting information, p. 16346 - 16356 (2020/10/26)
The metal-organic framework (MOF) HKUST-1 with a tbo topology serves as an archetypal tunable and isoreticular framework platform for targeting desired applications, but the design and synthesis of tbo-covalent organic frameworks (COFs) remains a formidable challenge. Here we demonstrate the successful use of reticular chemistry as an appropriate strategy for the design and deliberate construction of COFs with a tbo topology. The judicious selection of the perquisite planar building blocks, 4-connected square tetramine of porphyrin and 3-connected trigonal trialdehydes of triphenylamine, allows the condensation of two tbo-COFs, the first examples of COFs with a tbo topology. The resulting COFs both crystallize in the cubic Pm3ˉ space group and adopt a non-interpenetrated open framework, in which each tritopic linker connects to three square units forming a truncated Td-octahedron and occupies the alternating triangular faces of the truncated octahedron. Owing to the presence of two different types of photoredox-active moieties, the two COFs can be efficient heterogeneous photocatalysts for the oxidative hydroxylation of arylboronic acids and the reductive defluoroalkylation of trifluoromethyl aromatics with alkenes. The present finding will provide an impetus to examine the potential of tbo-COFs as a new platform for engineering multifunctional materials via expansion and functionalization of building blocks.
Facile one-pot nanocatalysts encapsulation of palladium-NHC complexes for aqueous Suzuki-Miyaura couplings
Chen, Chao,Zheng, Qing,Ni, Shengliang,Wang, Hangxiang
, p. 4624 - 4630 (2018/03/21)
Organic transformations using water as the solvent have been the focus of intense investigation. We herein present a strategy that uses simple nanoparticle encapsulation to fabricate water-soluble nanocatalysts (NCs) for aqueous cross-coupling reactions. To achieve this goal, three types of N-heterocyclic carbene (NHC)-palladium (Pd) complexes (i.e., 1b, 2b, and 3b) with the chemical formula [PdL(CH3CN)Cl]PF6 (where L is a bidentate pyridine- or pyrimidine-bearing NHC ligand) have been synthesized, and their structures were characterized by NMR spectroscopy and X-ray crystallography. Exploiting a facile one-pot encapsulation process, the water-insoluble Pd-NHC complexes can be integrated into the hydrophobic cores of micelles composed of an amphiphilic copolymer. These water-dispersed nanoparticles exhibited excellent catalytic activity in aqueous Suzuki-Miyaura couplings. Among these NCs, 3b-NC, bearing a mesityl moiety on its NHC ligand, was found to be the most active catalyst under the tested reaction conditions. More impressively, 3b-NC can be reused for at least five cycles without substantial loss of catalytic activity.
Covalent Triazine Frameworks via a Low-Temperature Polycondensation Approach
Wang, Kewei,Yang, Li-Ming,Wang, Xi,Guo, Liping,Cheng, Guang,Zhang, Chun,Jin, Shangbin,Tan, Bien,Cooper, Andrew
supporting information, p. 14149 - 14153 (2017/10/17)
Covalent triazine frameworks (CTFs) are normally synthesized by ionothermal methods. The harsh synthetic conditions and associated limited structural diversity do not benefit for further development and practical large-scale synthesis of CTFs. Herein we report a new strategy to construct CTFs (CTF-HUSTs) via a polycondensation approach, which allows the synthesis of CTFs under mild conditions from a wide array of building blocks. Interestingly, these CTFs display a layered structure. The CTFs synthesized were also readily scaled up to gram quantities. The CTFs are potential candidates for separations, photocatalysis and for energy storage applications. In particular, CTF-HUSTs are found to be promising photocatalysts for sacrificial photocatalytic hydrogen evolution with a maximum rate of 2647 μmol h?1 g?1 under visible light. We also applied a pyrolyzed form of CTF-HUST-4 as an anode material in a sodium-ion battery achieving an excellent discharge capacity of 467 mAh g?1.
Triphenylamine derivatives: Different molecular packing and the corresponding mechanoluminescent or mechanochromism property
Fang, Manman,Yang, Jie,Liao, Qiuyan,Gong, Yanbin,Xie, Zongliang,Chi, Zhenguo,Peng, Qian,Li, Qianqian,Li, Zhen
supporting information, p. 9879 - 9885 (2017/10/13)
Mechanoluminescence (ML), a fantastic phenomenon, has attracted increasing attention. However, to date, enumerable bright ML luminogens have been reported based on AIE building blocks. Herein, a new non-AIE unit of triphenylamine, for the first time, is u
