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    Home > Professor Yang Shangfeng, Professor Yang Jinlong and Professor Ji Xingxing of the University of science and technology of China have made new progress in the study of chemical functionalization and stability of melatonin

    Professor Yang Shangfeng, Professor Yang Jinlong and Professor Ji Xingxing of the University of science and technology of China have made new progress in the study of chemical functionalization and stability of melatonin

    • Last Update: 2019-01-04
    • Source: Internet
    • Author: User
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    Recently, Professor Yang Shangfeng, Professor Yang Jinlong and Professor Ji Xingxing of the University of science and technology of China have made new progress in the research of chemical functionalization and stability of melatonin Through the reaction of azides with the oligomeric black phosphorus nanoparticles, they successfully prepared the pentacoordinated covalent functionalized oligomeric black phosphorus nanoparticles (bpnss), which significantly improved its stability in water, and the effect was better than other chemical functionalization methods reported in the literature Relevant research results were published in angew Chem Int ed (DOI: 10.1002 / anie 201813218) As a new type of two-dimensional material, the band gap can be adjusted with the number of layers, and the mobility of carriers is high However, there are lone pair electrons on the phosphorus atom of the fifth group, which leads to the oxidation and degradation of a few layers of black phosphorus nanoflakes The poor stability in the air and water environment seriously restricts the application of black phosphorus Therefore, how to improve the stability of black phosphorus is an urgent problem to be solved Covalent functionalization is a very important method for passivation of bpnss with high reactivity However, the covalent functionalization method reported in the literature is only limited to the formation of P-C or p-o-c single bond through the functionalization of diazonium salt or nucleophilic addition reaction Although it can improve the stability of bpnss, the phosphorus atom after the reaction is a four coordinated structure, and there is still an uncoordinated single electron, which inevitably restricts its passivation effect Therefore, it is necessary to develop new covalent functionalized bpnss to achieve better passivation effect Through the reaction of bpnss with azides, the researchers successfully added P = n double bond to black phosphorus, and obtained f-bpnss Interestingly, by tracking the reaction process, they found that two products (products with P = n double bond and p-n single bond) were formed at the beginning of the reaction As the reaction progressed, the addition products of p-n single bond gradually transformed into the addition products of P = n double bond, and the final products were the addition products of P = n double bond Then, they tracked the decay of f-bpnss and original bpnss in water (without deoxygenation) for 21 days by using UV-Vis spectrum, and found that the stability of f-bpnss in water was increased by about 12 times, and the passivation effect was also increased by about 4.7 times compared with the diazonium salt functional passivation reported in the literature The reason is that after P = n double bond is added to the phosphorus atom, the phosphorus atom is in the coordination saturation state of five coordination, and the lone pair electron can be completely bonded, so the passivation effect is better than the diazonium salt functionalization method based on four coordination phosphorus atom reported in the literature The results show that the strategy of five coordination covalent functionalization can achieve better stability of bpnss, deepen the understanding of the chemical properties of black phosphorus, and lay a foundation for the practical application of black phosphorus Figure 1 Synthesis route of f-bpnss (source: angelw Chem Int ed.) Liu Yajuan, doctoral student of Hefei National Research Center for microscale material science, is the first author of the paper, and Professor Yang Shangfeng, Professor Yang Jinlong and Professor Ji Xingxing are the co correspondents The research was supported by the Ministry of science and technology, the National Natural Science Foundation of China and the collaborative innovation center of quantum information and quantum technology.
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