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Cover Illustration
2022, Vol.8  No.3-4
The cover picture shows novel fluorenyl- orphyrins serving as charge trapping elements. With steric hin-drance building blocks of fluorene units, 2Flu-TPP presents highly nonplanar 3-dimensional structure which could effectively inhibit molecular packing and reduce the formation of leakage current paths. High-performance organic field effect transistor memory based on solu-tion-pro- cessing 2Flu-TPP element is achieved. More details are discussed in the article by Xie et al. on page 220006.
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  • Table of Content
      30 December 2022, Volume 8 Issue 3-4 Previous Issue    Next Issue
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    Contents: Gen. Chem. 3-4/2022
    General Chemistry. 2022, 8 (3-4): 0-0.  
    Abstract   PDF (336KB) ( )
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    Hydrogen Spillover in Electrochemical Hydrogen Evolution Reaction
    Ziyao Chen, Huai Qin Fu, Mengyang Dong, Yu Zou, Porun Liu, Huijun Zhao
    General Chemistry. 2022, 8 (3-4): 220007-220007.   DOI: 10.21127/yaoyigc20220007
    Abstract   PDF (769KB) ( )
    The dissociative chemisorption and energetically driven migration of atomic hydrogen on heterogenous electrocatalysts, i.e., hydrogen spillovers, which occur during electrochemical turnovers, have been intensively investigated recently on high-performance electrocatalysts for hydrogen evolution reaction. The elucidation of the hydrogen spillover not only reshapes the mechanistic understanding of the catalytic landscape but also aids in formulating efficient reaction pathways for catalyst designs. This perspective hence concisely summarizes the status of research on the hydrogen spillover effect in recent years, as well as the experimental methods to characterize the hydrogen spillover process and presents a prospect for future research direction.
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    Synthesis of Regioselective Carbohydrates Building Blocks by Heterogeneous Engineered Biocatalysts
    Jose M. Palomo
    General Chemistry. 2022, 8 (3-4): 220009-220009.   DOI: 10.21127/yaoyigc20220009
    Abstract   PDF (924KB) ( )
    Regioselective synthesis of carbohydrate building blocks by the application of biocatalytic approaches represents a convenient and sustainable way for the production of pharmaceuticals. The enormous potential of enzymes for the transformation of synthetic chemicals with high regioselectivity is on increasing awareness. This perspective focuses on showing some of the advances on the use of lipases engineering as immobilized catalyst for regioselective deprotection processes for potential industrial production glycoderivatives building blocks.
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    Halogen Bonding Promotes Purely Organic Room-Temperature Phosphorescence
    Kuo Liu, Bao-Yi Ren and Fu-Shun Liang
    General Chemistry. 2022, 8 (3-4): 220005-220005.   DOI: 10.21127/yaoyigc20220005
    Abstract   PDF (919KB) ( )
    Purely organic room-temperature phosphorescence (RTP) materials are promising candidates for high-tech applications. Herein, we highlight new development that promotes RTP emission of organic small molecules, high phosphorescent efficiency and long lifetime, via inter/intro-molecular halogen bonding.
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    Steric Hindrance Functionalized Porphyrins as Charge Trapping Elements for Organic Field Effect Transistor Memory
    Meng Xie, Linyi Bian, Hao Chong, Zhewei Zhang, Guangyi Liu, and Linghai Xie
    General Chemistry. 2022, 8 (3-4): 220006-220006.   DOI: 10.21127/yaoyigc20220006
    Abstract   PDF (1162KB) ( )
    Two novel fluorenyl-porphyrins 2Flu-TPP and 4Flu-TPP serving as charge trapping elements are designed and synthesized through BF3.Et2O catalyzed Friedel-Crafts reaction. With steric hindrance building blocks of fluorene units, 2Flu-TPP and 4Flu-TPP present highly nonplanar 3-dimensional structure, which could effectively inhibit molecular packing and intermolecular arrangement of porphyrins. As charge trapping elements, porphyrin groups provide the hole trapping sites, while fluorene units act as a hole blocking group to reduce the formation of leakage current paths. The pentacene-based organic field effect transistor memory devices based on 2Flu-TPP and 4Flu-TPP show memory windows of 48.93 and 49.20 V, respectively. The 2Flu-TPP device shows reliable endurance property with a large ON/OFF current ratio (1.1×107) and good charge retention time (2.41×105 after 2×103 s). This study suggests that porphyrin based steric hindrance small molecular elements have great promise for high-performance organic field effect transistor memory.
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