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Cover Illustration
2018, Vol.4  No.1
The cover picture shows an ingenious “top-down” method to prepare various transition metal compounds by etching A ions out from the precursor multi metal oxides (AxMyOz). The obtained products have diverse and fascinating structures, e.g., porous bulk MOn/2, morphology-retained bulk MOn/2, monodis-persed MOn/2 nanoparticles, assembled MOn/2 nanostructure, hollow MOn/2,  bulk HMO(n+1)/2, and core-shell structure by controlling the reaction conditions. These compounds may possess great potential applications in catalysis and energy storage. More details are discussed in the article by Dong et al. on page 170022.
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  • Table of Content
      21 March 2018, Volume 4 Issue 1 Previous Issue    Next Issue
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    Contents: Gen. Chem. 1/2018
    General Chemistry. 2018, 4 (1): 189001-189001.  
    Abstract   PDF (319KB) ( )
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    Writing with Light: Recent Advances in Optical Storage Property of Azobenzene Derivatives
    A. R. Yuvaraj, Sandeep Kumar
    General Chemistry. 2018, 4 (1): 170020-170020.   DOI: 10.21127/yaoyigc20170020
    Abstract   HTML   PDF (1306KB) ( )

    The mechanism of writing with light depends on photoisomerization ability of light sensitive compounds. The recent advances in photoisomerization phenomenon of azobenzene derivatives are explained on the basis of experimental evidence. Azobenzene derivatives have few limitations in optical storage when it comes to practical and industrial purpose. However, azobenzene derivatives have significant interests because of their excellent light sensitivity and isomerization properties. The fabrication of azobenzene films also plays an important role in the production of an optical storage device. The molecular level layer properties, writing and erasing can be tuned by modification of molecular structures. To explain the concept, writing with light needs high light sensitivity and long duration of thermal back relaxation property. Hence, tuning of thermal back relaxation in the storage process is mainly considered.

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    Conjugated Polymers for NIR-I and NIR-II Imaging
    Ye Liu, Jun Yuan, Věra Cimrová, Yingping Zou
    General Chemistry. 2018, 4 (1): 170021-170021.   DOI: 10.21127/yaoyigc20170021
    Abstract   HTML   PDF (244KB) ( )

    In vivo biological imaging in first near-infrared window (NIR-I, 700-900 nm) and the second near-infrared window (NIR-II, 1000-1700 nm) using conjugated polymers have recently attracted great interest. Compared with imaging in visible region (400-700 nm), NIR bioimaging can provide deeper tissue penetration and higher spatial resolution due to fewer scattering of longer-wavelength photons. Moreover, most of NIR-I and NIR-II conjugated copolymers have been reported with tunable excitation and emission of fluorophores through modification of their donor-acceptor structures. In this minireview, we focus on the recent advances on chemical synthesis of conjugated polymers and their biological imaging in NIR-I and NIR-II windows.

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    Magnetic Resonance Switch for Biological Detection
    Chenglin Yan, Qiwei Tian
    General Chemistry. 2018, 4 (1): 170019-170019.   DOI: 10.21127/yaoyigc20170019
    Abstract   HTML   PDF (387KB) ( )

    Magnetic nanoparticles (MNPs) possess great potential in biological applications, especially as a highly useful tool or contrast agents for clinical diagnosis and disease monitoring in magnetic resonance imaging. When external magnetic field is introduced, the local magnetic field inhomogeneity caused by magnetization of MNPs can induce the change of relaxation for realizing the imaging. Therefore, rational design of magnetic relaxation switches sensors capable of biological detection has been a major goal in the advancement of clinical application. In this minireview, we summarize some advances on magnetic sensors, involving in sensing principles of MNPs and biological applications of magnetic sensors; moreover, we collect important and up-to-date information, which may help to develop the method of obtaining high performance magnetic sensors, especially for biological application.

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    A Facile Top-Down Method to Fabricate Transition Metal Compounds with Fascinating Structures from Etching method
    Wujie Dong, Shuying Nong, Zichao Liu, Xin Wang, Xiaotao Yuan, Yantao Zhao, Ruiqi Wang, Chenlong Dong, Zidi Yang, Jianing Gan, Fuqiang Huang
    General Chemistry. 2018, 4 (1): 170022-170022.   DOI: 10.21127/yaoyigc20170022
    Abstract   HTML   PDF (1345KB) ( )

    Transition metal oxides with nanoscale or special micro-structures are favoured both in scientific research and industry application. Although many methods are developed, there is still a need and a potential payoff for developing a novel and convenient synthetic method. Inspired by nature hydrothermal vent, herein, we develop an ingenious “top-down” method to prepare various transition material compounds, which have diverse and fascinating structures. Our design thought is to etch the A ions by acid from the precursor AxMyOz (A=alkaline and alkaline earth metal, M=transition metal) and leave the MOn/2 or HMO(n+1)/2 behind under the hydrothermal condition. As a result, we obtain various structures like amorphous mesoporous bulk Nb2O5, morphology-re- tained bulk HNbO3 and ZrO2, monodispersed ZrO2 nanoparticles, assembled porous ZrO2 nanostructure, hollow TiO2, and the derived core-shell structure. These materials have great potential application in catalysis and energy storage. We employed hollow TiO2 cube as the high cut-off anode of lithium-ion batteries and harvested excellent performance. After these fruitful attempts, we have found that etching AxMyOz to obtain transition metal compound is a complex reaction containing some different competing reactions, thus allowing us to regulate and control the microstructure of the products by adjusting the reaction condition. We believe there are more interesting structures waiting to be fabricated by similar “top-down” method and these unique materials have great potential in many fields.

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    Preparation of An Ibuprofen Polysaccharide Hydrogel Based on a Dual-Role Cross-Linker
    Yiou Tao, Yang Han, Ting Wang
    General Chemistry. 2018, 4 (1): 180002-180002.   DOI: 10.21127/yaoyigc20180002
    Abstract   HTML   PDF (770KB) ( )

    A polysaccharide hydrogel is prepared by mixing hydroxyethylcellulose (HEC), ibuprofen (IBU) and ethylenediamine-β-cyclodextrin (EDA-CD) in water with special sequence at certain concentration. The biocompatible polymer of HEC is used as the hydrogel matrix. IBU is a poorly water-soluble drug, which is widely applied to the clinical. EDA-CD with dual-role is used as cross-linker and hydrophobic drug carrier. FTIR, 1H NMR and 13C NMR were used to characterize EDA-CD. Hildebrand-Benesi equation and phase solubility method were used to investigate the binding mode of EDA-CD and IBU. The binding constant of EDA-CD and IBU is 4055 L·mol-1, the stoichiometry ratio is 1:1, and the water solubility of IBU in EDA-CD solution can reach 5 g in 100 mL of water. SEM was used to observe the surface morphology of the dry hydrogel. A porous surface analysis of the dry hydrogel has revealed that the molecule weight and the amount of the HEC polymer affect obviously the gelation process. UV spectrophotometer was used to detect the content of IBU in the hydrogel. The in vitro release test of IBU in hydrogel was investigated and some suitable kinetic models are used for explaining the releasing mechanism.

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