Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
Volume 48 , Issue 12
Showing 1-32 articles out of 32 articles from the selected issue
Letter
  • Xingchi Lin, Chun Wang, Qiming Chen, E Yang, Wei Lv, Wen Wang, Qidan L ...
    2019 Volume 48 Issue 12 Pages 1433-1436
    Published: December 05, 2019
    Released: December 05, 2019
    JOURNALS RESTRICTED ACCESS

    A series of novel praseodymium (Pr)-bonded polymers with fluorene, phthalimide and phenanthroline moieties in the main chain were synthesized via the coordination reaction and palladium-catalyzed Suzuki coupling reaction. The resistive switching devices with the configuration ITO/Polymer/Al exhibited nonvolatile write-once-read-many-times (WORM) memory behavior. The introduction of Pr complex into the polymer main chain played a key role in the memory performance of the devices.

  • Shan Chen, Shuangyue Hou, Penghui Xiong, Ying Xiong, Gang Liu, Yangcha ...
    2019 Volume 48 Issue 12 Pages 1437-1440
    Published: December 05, 2019
    Released: December 05, 2019
    JOURNALS RESTRICTED ACCESS

    Extended Derjaguin-Landau-Verwey-Overbeek (DLVO) theory has been the most commonly used theory to analyze the adhesion of bacteria on a solid surface. The adhesion of Shewanella oneidensis MR-1 on an electrode surface would directly affect the electricity production performance of microbial fuel cells (MFCs). In this paper, an analytical method for the adhesion between electricigens and electrode surface was established and its feasibility was verified based on the extended DLVO theory. The surface free energy of gold microarray electrodes based on glass and polymethyl methacrylate (PMMA) substrates was elucidated using contact angles, and the total interaction free energy curve of electrodes and S. oneidensis MR-1 was analyzed. Because of the potential barrier of repulsive force of gold microarray electrodes based on glass substrate was easy to cross, the architecture of S. oneidensis MR-1 aggregation on the surface was dense and stable. By contrast, on PMMA substrate, S. oneidensis MR-1 could form a loose and unstable aggregation due to the high potential barrier of repulsive force. The theoretical analysis was consistent with the experimental results by observing the scanning electron microscope images of S. oneidensis MR-1 aggregation. The extended DLVO theory could well predict the adhesion of S. oneidensis MR-1 aggregation on the surface of gold microarray electrodes based on different substrates, providing guidance for electrode design and optimization of MFCs.

  • Toru Saito, Yu Takano
    2019 Volume 48 Issue 12 Pages 1441-1444
    Published: December 05, 2019
    Released: December 05, 2019
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    The performance of the approximate spin projected (AP) coupled cluster singles and doubles (CCSD) methods based on the spin-unrestricted Hartree-Fock and Brueckner determinants, namely AP-UCCSD and AP-UBD, is benchmarked for singlet-triplet energy gaps in various open-shell species. The test set includes the TS12 set, organic diradicals, and two binuclear copper complexes. We demonstrate that chemical accuracy (1 kcal/mol) can be reached for small open-shell molecules. These methods also provide highly accurate results for larger systems, in good agreement with the established equation of motion spin-flip CCSD (EOM-SF-CCSD) results.

  • Kingsley Christian Kemp, Seungwan Seo, Sang Hyun Ahn, Suk Bong Hong
    2019 Volume 48 Issue 12 Pages 1445-1447
    Published: December 05, 2019
    Released: December 05, 2019
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    Here, we report the direct synthesis of ITQ-24 with SiO2/Al2O3 = ca. 70–∞, a large-pore zeolite with IWR topology which was originally discovered as an alumino-germanosilicate composition in hydroxide media, using 1,1′-[1,4-phenylenebis(methylene)]bis(1-methylpyrrolidin-1-ium) ion as an organic structure-directing agent in relatively concentrated (H2O/SiO2 = 9.0) fluoride media.

  • Jing Chen, Youliang Cheng, Huan Li, Changqing Fang, Hang Li, Kaiye Wan ...
    2019 Volume 48 Issue 12 Pages 1448-1451
    Published: December 05, 2019
    Released: December 05, 2019
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    Highly stable Ag NPs were synthesized using anionic polyacrylamide (APAM) as the template and reductant. When APAM concentration was 1.50 µM, as-prepared Ag NPs with the diameter of about 3.8 nm had a quantum yield as high as 1.51%. When adding Cu2+ and Hg2+ into the Ag NPs solution, the fluorescence was quenched effectively. The response between the fluorescence intensity and metal ions concentration allowed for a linear relation, and the detecting limitation for Cu2+ was lower than 1 × 10−9 mol/L.

Highlight Review
  • Kazuyuki Ishii
    2019 Volume 48 Issue 12 Pages 1452-1461
    Published: December 05, 2019
    Released: December 05, 2019
    JOURNALS RESTRICTED ACCESS

    The last few decades have seen rapid development in molecular science and technology. In this review, photofunctionalization of phthalocyanines (Pcs) is introduced from the viewpoint of biological applications and advanced materials, such as fluorescence probes, photodynamic therapy photosensitizers, photocontrollable magnetic materials, photoconductors, and heat shielding materials. These would be useful model cases for molecular functionalization.

    The last few decades have seen rapid development in molecular science and technology. In this review, photofunctionalization of phthalocyanines (Pcs) is introduced from the viewpoint of biological applications and advanced materials, such as fluorescence probes, photodynamic therapy photosensitizers, photocontrollable magnetic materials, photoconductors, and heat shielding materials. These would be useful model cases for molecular functionalization. Fullsize Image
     
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