• Title/Summary/Keyword: Advanced Chemistry

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Theoretical Study on Structures and Energetics of Small Water Clusters

  • Park Yeong Jae;Kang Young Kee;Yoon Byoung Jip;Jhon Mu Shik
    • Bulletin of the Korean Chemical Society
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    • v.3 no.2
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    • pp.50-55
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    • 1982

  • A study of small water clusters composed of two to seven molecules has been performed by using the revised empirical potential function for conformational analysis (REPFCA). Various structures of clusters have been investigated and the relative probability of cluster per molecule is discussed. In general, cyclic structures of water clusters are more favorable than open structures. It is found that cyclic pentamer is the most favorable unit structure in the water cluster.

  • https://doi.org/10.5012/bkcs.1982.3.2.50 인용 PDF

Synthesis of new Hydantoin-3-Acetic acid Derivatives

  • Oh, Chang-Hyun;Kang, Yong-Koo;Park, Sang-Woo;Cho, Jung-Hyuck;Kwon, Soon-Kyung
    • Bulletin of the Korean Chemical Society
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    • v.9 no.4
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    • pp.231-235
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    • 1988

  • Through the Bucherer-Berg method, new 5-alkylthiomethyl or 5-alkylsulfonylmethylhydantoins were prepared. The reaction of ethyl chloroacetate with these compounds gave 3-acetate and the subsequent hydrolysis with dilute sodium hydroxide resulted in 3-hydantoinacetic acid derivatives. These products are expected to exhibit anti-inflammatory and analgestic activities.

  • https://doi.org/10.5012/bkcs.1988.9.4.231 인용 PDF

New Semiconducting Multi-branched Conjugated Molecules Bearing 3,4-Ethylene-dioxythiophene-based Thiophenyl Moieties for Organic Field Effect Transistor

  • Kim, Dae-Chul;Lee, Tae-Wan;Lee, Jung-Eun;Kim, Kyung-Hwan;Cho, Min-Ju;Choi, Dong-Hoon;Han, Yoon-Deok;Cho, Mi-Yeon;Joo, Jin-Soo
    • Macromolecular Research
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    • v.17 no.7
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    • pp.491-498
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    • 2009

  • New $\pi$-conjugated multi-branched molecules were synthesized through the Homer-Emmons reaction using alkyl-substituted, 3,4-ethylenedioxythiophene-based, thiophenyl aldehydes and octaethyl benzene-l,2,4,5-tetrayltetrakis(methylene) tetraphosphonate as the core unit; these molecules have all been fully characterized. The two multi-branched conjugated molecules exhibited excellent solubility in common organic solvents and good self-film forming properties. The semiconducting properties of these multi-branched molecules were also evaluated in organic field-effect transistors (OFET). With octyltrichlorosilane (OTS) treatment of the surface of the $SiO_2$ gate insulator, two of the crystalline conjugated molecules, 7 and 8, exhibited carrier mobilities as high as $2.4({\pm}0.5){\times}10^{-3}$ and $1.3({\pm}0.5){\times}10^{-3}cm^2V^{-1}s^{-1}$, respectively. The mobility enhancement of OFET by light irradiation ($\lambda$ = 436 nm) supported the promising photo-controlled switching behavior for the drain current of the device.

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