Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
Volume 44 , Issue 8
Showing 1-36 articles out of 36 articles from the selected issue
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  • Xu-Qing Wang, Wei Wang, Yu-Xuan Wang, Hai-Bo Yang
    2015 Volume 44 Issue 8 Pages 1040-1046
    Published: August 05, 2015
    Released: August 05, 2015
    [Advance publication] Released: May 12, 2015
    JOURNALS FREE ACCESS
    In this review article, a brief summary on the development of supramolecular polymers constructed through self-sorting host–guest interactions is presented. On the basis of self-sorting host–guest interaction with high fidelity between various macrocyclic hosts and their complementary guests, the facile construction of diverse supramolecular polymers with multiple macrocyclic hosts inserted in the backbones has been successfully realized under suitable polymerization conditions. Classified according to the different kind of macrocyclic hosts and their privileged guests, four types of supramolecular polymers derived from various self-sorting host–guest interactions will be briefly reviewed. The focus of this review will be on the design strategies, structural features, and functionalities of these supramolecular polymers.
    A brief review on development of supramolecular polymers constructed through self-sorting host–guest interactions is presented. Classified by the different kind of macrocyclic hosts and their privileged guests, four types of supramolecular polymers derived from various self-sorting host–guest interactions will be briefly summarized. The focus of this review will be put on the design strategy, structural features, and functionality of these supramolecular polymers. Fullsize Image
     
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Editor’s Choice
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  • Chang Eun Oh, Young Ho Park, Sungmin Kim, Donggun Lim, Sung Young Park ...
    2015 Volume 44 Issue 8 Pages 1068-1070
    Published: August 05, 2015
    Released: August 05, 2015
    [Advance publication] Released: May 21, 2015
    JOURNALS RESTRICTED ACCESS
    Mussel-inspired linking of titanium dioxide (TiO2) nanoparticles on chemically reduced graphene oxide (rGO) was successfully attempted to provide novel hybrid photocatalysts accomplishing enhanced and recyclable photocatalytic activity for the degradation of methylene blue as a model compound for environmental pollutants under either ultraviolet or even visible light.
  • Alireza Karami, Roya Majidi
    2015 Volume 44 Issue 8 Pages 1071-1073
    Published: August 05, 2015
    Released: August 05, 2015
    JOURNALS RESTRICTED ACCESS
    We have used density functional theory to investigate the possibility of using graphyne nanotubes for the detection of toxic gases such as formaldehyde and hydrogen sulfide. The effect of these gases on the electronic properties of zigzag nanotubes formed based on α-graphyne is studied. The large adsorption distance, small adsorption energy, and small charge transfer indicate physisorption of formaldehyde and hydrogen sulfide on the graphyne nanotubes. It is found a considerable effect on the electronic properties of graphyne nanotubes due to charge transfer from the molecules to the nanotubes. The zigzag α-graphyne nanotubes with semiconducting properties become n-type semiconductors with the adsorption of formaldehyde and hydrogen sulfide. Our results show that the α-graphyne nanotubes are promising materials for the detection of toxic gases.
  • Yanli Ding, Xiaojing Han, Changliang Sun, Jirong Mu
    2015 Volume 44 Issue 8 Pages 1074-1076
    Published: August 05, 2015
    Released: August 05, 2015
    [Advance publication] Released: May 13, 2015
    JOURNALS RESTRICTED ACCESS
    The SN2 reactions at C and Si have been investigated by ABEEM-σπ method compared with the potential acting on an electron in a molecule (PAEM). The ABEEM-σπ model demonstrates the charge distributions of the atom region, bond region, and lone-pair electron region during the course of the reaction. The differences between title reactions have been demonstrated. Studies indicate that there are good linear correlations among the charges obtained by ABEEM-σπ method, the force constants, the relative energies, the ionization potentials, etc. This study enhances our understanding of the electron transfer from the nucleophile to the leaving group.
  • Keita Nakai, Syuji Fujii, Yoshinobu Nakamura, Shin-ichi Yusa
    2015 Volume 44 Issue 8 Pages 1077-1079
    Published: August 05, 2015
    Released: August 05, 2015
    [Advance publication] Released: May 19, 2015
    JOURNALS OPEN ACCESS
    Thermoresponsive liquid marbles were prepared from water and 1-bromo-3-fluoro-4-iodobenzene (BFI) powder with a melting point of 46.5 °C. The liquid marble can be floated on the surface of bulk water at room temperature, which is lower than the melting point of BFI. When the temperature of bulk water was increased above the melting point, the liquid marble disintegrated to leak the interior water to bulk water. Heating can be applied as a trigger of a chemical reaction between the interior reactant and another reactant in bulk water.
  • Xiaoli Gu, Kang Zhou, Yi Feng, Jianfeng Yao
    2015 Volume 44 Issue 8 Pages 1080-1082
    Published: August 05, 2015
    Released: August 05, 2015
    [Advance publication] Released: May 19, 2015
    JOURNALS RESTRICTED ACCESS
    Amino acid L-histidine was introduced to the preparation of zeolitic imidazolate framework ZIF-L with controllable morphologies. Thick leaf-like particles (2–3 µm in length) with a thickness of about 1 µm were prepared, and their crystallinity decreased when less L-histidine was used. The decreased amount of water in the precursor solution resulted in a morphology change from a leaf-like structure to irregular microsized particles. The regulation of ZIF crystal morphology will lead to more versatile applications of ZIFs as functional materials in separation and adsorption.
  • Guangqiang Fang, Hua Li, Jingang Liu, Hongjiang Ni, Haixia Yang, Shiyo ...
    2015 Volume 44 Issue 8 Pages 1083-1085
    Published: August 05, 2015
    Released: August 05, 2015
    [Advance publication] Released: May 20, 2015
    JOURNALS RESTRICTED ACCESS
    A series of polyimide aerogels with intrinsically atomic-oxygen-resistant features have been synthesized. For this purpose, 3,3′,4,4′-biphenyltetracarboxylic dianhydride (s-BPDA) was copolymerized with 2,2′-dimethylbenzidine (DMBZ) and a polyhedral oligomeric silsesquioxane (POSS)-containing aromatic diamine, N-[(heptaisobutylPOSS)propyl]-3,5-diaminobenzamide (DA-POSS), with octa(aminophenyl)silsesquioxane (OAPS) as the crosslinker via sol–gel procedures followed by supercritical carbon dioxide (scCO2) drying treatments.
  • Ying Chang, Hui Wang, Huihu Wang, Ming Yan, Bei Liu, Shijie Dong
    2015 Volume 44 Issue 8 Pages 1086-1088
    Published: August 05, 2015
    Released: August 05, 2015
    [Advance publication] Released: May 21, 2015
    JOURNALS RESTRICTED ACCESS
    Water droplets containing MgCl2 and urea, as the water phase of xylene/water/span-80 water-in-oil (w/o) emulsion system, can act as microreactors where spherical MgO precursor powders with porous microstructure were obtained via homogeneous precipitation. By changing the volume ratio of span-80 to xylene, spherical powders with different sizes were synthesized, and the effect of span-80/xylene volume ratio on powder morphology was examined. The as-prepared powders as well as their precursors were characterized by means of field-emission scanning electron microscopy (FE-SEM), laser particle size analysis (LPS), N2-adsorption measurements (BET) and thermogravimetry and differential thermal analysis (TG-DTA). The TG-DTA result indicated that the optimal sintering temperature of precursor powders was 450 °C. The FE-SEM results showed that the span-80-to-xylene volume ratio had a marked effect on the morphology of powders. When the ratio was 1:40, the FE-SEM and LPS results confirmed the formation of the powder microspheres with a size range of 1–16 µm, and the surface area of the microspheres was about 75.7 m2 g−1 according to the BET result.
  • Ludmila Cojocaru, Satoshi Uchida, Ajay Kumar Jena, Tsutomu Miyasaka, J ...
    2015 Volume 44 Issue 8 Pages 1089-1091
    Published: August 05, 2015
    Released: August 05, 2015
    [Advance publication] Released: May 21, 2015
    JOURNALS OPEN ACCESS
    Methylammonium lead mixed-halide perovskite (CH3NH3PbI3−xClx) has been widely used for photovoltaic conversion. Supposedly, the presence of chloride ions in perovskite precursors enhances the coverage, morphology, and stability of the final perovskite film. It also improves carrier diffusion length in the perovskite film. Due to these advantages, the mixed-halide compound has been adopted for use in planar structure perovskite solar cells and it has led to significant enhancement in power conversion efficiency. However, until now, the exact content of chloride in the final product (CH3NH3PbI3−xClx) is under debate and has not been reported yet. In this article, we show the exact amount of chloride ions in the final perovskite film, determined by chemical analysis with ion chromatography.
  • Takamichi Terao
    2015 Volume 44 Issue 8 Pages 1092-1094
    Published: August 05, 2015
    Released: August 05, 2015
    [Advance publication] Released: May 21, 2015
    JOURNALS RESTRICTED ACCESS
    Dendritic brushes, which provide higher stability against the aggregation of colloidal suspensions, were investigated using multicolor domain decomposition Monte Carlo simulations. Solvent molecules were explicitly considered, and the profiles of the monomer density and perimeter density distributions were calculated. The results show that the power-law dependence on grafting density depends weakly on the spacer length, the distance between neighboring branch points in dendrons. No apparent evidence was found for backfolding in the dendritic polymer brushes.
Editor’s Choice
Letter
  • Dengfeng Wu, Changqing Dai, Shaojie Li, Daojian Cheng
    2015 Volume 44 Issue 8 Pages 1101-1103
    Published: August 05, 2015
    Released: August 05, 2015
    [Advance publication] Released: May 26, 2015
    JOURNALS RESTRICTED ACCESS
    A facile one-pot method for synthesizing different morphologies of PdCu nanocrystals (NCs) has been introduced. The morphologies of PdCu NCs can be controlled by tuning the amount of the single capping ligand of triphenylphosphine (TPP) in an organic solvent medium. Highly structured cubic, sphere, and sphere-like PdCu NCs were obtained in a sufficient amount, a small amount, and the absence of TPP, respectively. It is found that these PdCu NCs exhibit efficient catalytic activities for formic acid oxidation (FAO). The mass activities of these carbon-supported NCs follow the order of sphere PdCu/C > sphere-like PdCu/C > cubic PdCu/C at a potential of 0.2 V (vs. SCE). Among these NCs, the sphere PdCu/C catalyst exhibits the highest FAO activity, which is 1.7 times larger than that of commercial Pd/C catalyst at 0.2 V. Our results show that the surfactant loading can play a key role in the shape-controlled synthesis of PdCu nanocrystals for FAO.
Editor’s Choice
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Editor’s Choice
  • Zhiwei Li
    2015 Volume 44 Issue 8 Pages 1140-1141
    Published: August 05, 2015
    Released: August 05, 2015
    [Advance publication] Released: May 30, 2015
    JOURNALS OPEN ACCESS
    Hybrid organic/inorganic perovskite solar cells have been rapidly developed with spectacular success in both nanostructured and thin-film versions. Herein, we report a simple solvothermal method using WCl6 and NH3·H2O as precursors in ethanol solvent at 200 °C for 24 h to fabricate WO3 nanocrystals (NCs) as the hole transport layer in an inverted perovskite solar cell. The thin WO3 NC film with a smooth and compact surface enabled the formation of a continuous and compact layer of well-crystallized CH3NH3PbI3 in a two-step solution process. A cell efficiency of 7.68% was obtained, which is a promising planar perovskite solar cell based on an inorganic hole extraction layer.
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