• Title/Summary/Keyword: Journal of Chemical Education

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Preparation and Characterization of the Paramagnetic Rhenium Complex, $(CO)_4ReL_2$ [$L_2$= 2,3-Bis(diphenylphosphino)maleic anhydride]

  • Kim Dae-Soo;Chung Young-Baek;Kang Sang-Ook;Ko Jae-Jung
    • Bulletin of the Korean Chemical Society
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    • v.13 no.3
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    • pp.235-240
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    • 1992

  • The paramagnetic complex of $(CO)_4ReL_2[L_2=$ 2,3-Bis(diphenylphosphino)maleic anhydride] was prepared both by the photochemically induced homolytic splitting of $Re_2(CO)_10withL_2and$ by the chemical reduction of $[(CO)_4ReL_2]SO_3CF_3.$ The $(CO)_4ReL_2$ compound was characterized by ESR spectrum. The spectrum exhibits three group of sextets arising from one $^{185.187}Re$ nucleus (Ⅰ= 5/2) and two equivalent $^31P$ nuclei (Ⅰ= 1/2). Infrared, ESR, and cyclic voltammetric data are reported for all of the complexes prepared in this study.

  • https://doi.org/10.5012/bkcs.1992.13.3.235 인용 PDF

Investigation of Undergraduate Students' Understanding on Fundamental Chemical Reaction Based on Electron Flow (전자 흐름에 기초한 기초적인 화학 반응에 관한 대학생들의 이해도 조사)

  • Lee, Sang-Gwon;Gwon, Jeong-Gyun;Kim, Gyeong-Mi;Park, Guk-Tae
    • Journal of the Korean Chemical Society
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    • v.46 no.3
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    • pp.279-286
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    • 2002

  • The purpose of this study was to investigate undergraduate students' preconception about the needed knowledge to understand organic reactions based on electron flow and undergraduate students' ability that understand fundamental chemical reaction based on electron flow, and was to offer pertinent teaching and learning method. For this study, 18 sophomores that majored in chemistry education of H University, were sampled. Test papers were newly developed that based on previous research. Undergraduate students' response was classified and reasons of the response were qualitatively analyzed by interview. According to the results of this study, it was found that undergraduate students had good understanding on the concept about the electron configuration of atoms and on the concepts about the needed knowledge to understand chemical reactions based on electron flow. But they didn't apply the concepts to the fundamental chemical reaction. Therefore, teaching and learning strategy that apply the needed concepts to understand chemical reactions based on electron flow to chemical reactions should be developed.

  • https://doi.org/10.5012/jkcs.2002.46.3.279 인용 PDF KSCI

A Study on Thermal Conductive Acrylic Pressure Sensitive Adhesive with Alumina and Graphite (알루미나와 흑연을 포함하는 열전도성 아크릴 점착제의 연구)

  • Oh, Ji Hwan;Jang, Sun Ho;Yoo, Seong Sik;Cho, Ryong
    • Journal of the Semiconductor & Display Technology
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    • v.16 no.3
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    • pp.93-98
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    • 2017

  • 2-Ethylhexyl acrylate, butyl acrylate, methyl methacrylate, and 2-hydroxyethyl methacrylate were polymerized to synthesize acrylic pressure sensitive adhesive (PSA). Alumina and graphite as a filler were added to acrylic PSA to give thermal conductivity. In case of addition of both graphite and alumina, the thermal conductivity of PSA was increased compared with alumina alone due to enhancement of contact between two fillers followed by increasing thermal path in PSA matrix.

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