作者：
Shan, Qiulanzhang, LeFu, xuwenQi, MinWei, JialuGan, WeiPu, YingShen, LingjunLi, XiangDepartment of Radiology
Kunming Third Peoele’s Hospital/Yunnan Clinical Medical Center for Infectious Diseases No. 319 Wujing Road Guandu District Yunnan Province Kunming City 650041 China Department of ICU
Kunming Third People’s Hospital/Yunnan Clinical Medical Center for Infectious Diseases Yunnan Province Kunming City 650041 China Department of Pharmacy
Kunming Third People’s Hospital/Yunnan Clinical Medical Center for Infectious Diseases Yunnan Province Kunming City 650041 China Department of Tuberculosis
Kunming Third People’s Hospital/Yunnan Clinical Medical Center for Infectious Diseases No. 319 Wujing Road Guandu District Yunnan Province Kunming City 650041 China
Objective: To explore the impact of the neutrophil–lymphocyte ratio (NLR) on magnetic resonance imaging (MRI) enhancement patterns in patients with spinal parenchymal tuberculosis. Methods: In this study, a retrospec...
详细信息
Crystalline and soluble 1D linear conjugated polymers (LCPs) have garnered considerable interest as cost-effective and efficient metal-free electrocatalysts for the oxygen reduction reaction (ORR) due to their high ex...
详细信息
Crystalline and soluble 1D linear conjugated polymers (LCPs) have garnered considerable interest as cost-effective and efficient metal-free electrocatalysts for the oxygen reduction reaction (ORR) due to their high exposure of catalytic sites and ease of processing. However, difficulties remain in achieving excellent ORR performance for 1D LCPs by conventional molecular design. Herein, it is demonstrated the utilization of quinoidal units as a promising strategy to develop 1D LCPs for ORR. The incorporation of quinoidal unit not only results in polymers with strong inter- and intra-molecular interactions and low-lying LUMO (lowest unoccupied molecular orbital) energy levels, but also provides polymers with good crystallinity and commendable charge carrier mobilities. The electronic properties of these polymers are fine-tuned through the introduction of additional heteroatoms and/or substituents in the monomers and comonomers to understand and optimize their ORR catalytic activity. Evaluation of their catalytic performances reveals a remarkable half-wave potential and limiting current density of up to 0.74 V (vs reversible hydrogen electrod) and 7.50 mA cm-2, respectively. Notably, these performances are achieved without the addition of carbon nanomaterials as support. This study offers a new insight into the design of highly efficient metal-free organic electrocatalysts. 1D linear conjugated polymers containing a quinoidal unit are synthesized as the metal-free electrocatalysts for oxygen reduction reaction. These polymers show good film-forming properties, well-ordered structures, and excellent charge transport abilities. As a result, they exhibit high oxygen reduction reaction catalytic activities without the need for carbon nanomaterials as support. image
Organic donor-acceptor cocrystals of π-conjugated molecues have shown diverse applications in materials science. However,most cocrystals exist in neutral forms dominated by π-π interactions, while the ionic congene...
Organic donor-acceptor cocrystals of π-conjugated molecues have shown diverse applications in materials science. However,most cocrystals exist in neutral forms dominated by π-π interactions, while the ionic congeners and corresponding properties are rarely studied due to difficulties in harnessing the degree of charge transfer. Herein, we report cocrystals of axially N-embedded quasi-carbon nanohoops(DPP-D and DPP-T) with electron deficient guests. By modulating the electron affinity of the acceptor guests, the electronic structures of the complexes can be tuned from neutral to ionic states. Specifically, DPP-D interacts with TCNB molecules to form neutral superstructures via intermolecular π-π interactions, giving rise to a deep-red emission in the solid state. In contrast, an ionic complex showing near-infrared region absorptions and paramagnetic character on account of strong charge-transfer interactions is generated when DDQ molecules are involved. Their unique properties can be explained by different degrees of charge transfer and assembly modes, which have clearly been manifested by crystal structures and theoretical calculations. Our studies provide rare examples of π-conjugated macrocycle-based donor-acceptor cocrystals in both neutral and ionic forms, and give insight to the design of multicomponent carbon nanomaterials.
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