• Title/Summary/Keyword: crystal structure

검색결과 3,785건 처리시간 0.028초

The Crystal Structure of Licarin-B $(C_{20}H_{20}O_4)$, A Component of the Seeds of Myristica fragrans

  • Kim, Yang-Bae;Park, Il-Yeong;Shin, Kuk-Hyun
    • Archives of Pharmacal Research
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    • 제14권1호
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    • pp.1-6
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    • 1991

  • The crystal structure of licarin-B, a component of Myristicae Semen was determined by single crystal X-ray diffraction analysis. Crystal of the compound, which was recrystallized from the mixture of hexane and ether, is monoclinic with a=12.740(1), b=7.219(1), c=9.284(1) ${\AA}$, ${\beta}=94.75(1)^{\circ}$, $D_x=1.26$, $D_m=1.27\;g/cm^3$, space group P21, and Z=2. The structure was solved by direct method and refined by least-squares procedure to the final R value of 0.040 for 1532 independent reflections ${F{\ge}3{\sigma}(F)}$. The compound is a dimeric phenylpropanoid, and belongs to the neolignan analogues. The molecules are arranged along with the screw axis. The intermolecular contacts appear to be the normal van der Waals' forces.

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The Crystal Structure of KR-27042, An Analgesic Capsaicinoid

  • Park, No-Sang;Kim, Yang-Bae;Jeong, Eun-Ju;Chung, Uoo-Tae;Park, Il-Yeong
    • Archives of Pharmacal Research
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    • 제25권1호
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    • pp.25-27
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    • 2002

  • The crystal structure of KR-21042, N-(3-Phenylpropyl )-4-hydroxy-3-methoxyphenylacetamide, was determined by single crystal X-ray diffraction analysis. The compound was recrystallized from a mixture of ethylacetate and n-hexane in monoclinic, space group $P2_1/c$, with a = 16.622(1), b = 6.215(1), c = 15.802(1) ${\AA},{\;}{\beta}=104.97(1)$, and Z = 4 The calculated density is $1.261{\;}g/cm^3$The structure was solved by the direct method and refined by full matrix least-squares procedure to the fecal R value of 0.068 for 2332 observed reflections.

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The crystal structure of pirprofen$(C_{3},\; H_{14},\; ClNO_2$), a non-steroidal antiinflammmatory agent

  • Kim, Yang-Bae;Park, Il-Yeong
    • Archives of Pharmacal Research
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    • 제19권1호
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    • pp.71-73
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    • 1996

  • The molecular structure of pirprofen, 3-chloro-4-(2,5-dihydro-1H-pyrrol-1-yl)-.alpha.-methyl-benzeneacetic acid, was determined by single crystal X-ray diffraction analysis. The compound was recrystallized from a mixture of chloroform and toluene in triclinic, space group P over $\bar1,\; with\; a=4.577(1),\; b=11.213(2),\; C=12.485(2){\AA},\alpa.=107.39(1),\;\beta=97.79(1),\;\gamma=92.03(2),\; and Z=2$ The calculated density is $1.384 g/cm^3$. The structure was solved by the direct method and refined by full matrix least-squares procedure to the final R value of 0.034 for 1681 independent reflections. The non-aromatic dihydropyrrol group is found to be coplanar to the central aromatic ring. The molecules are dimerized through the intermolecular hydrogen bonds at the carboxyl group in the crystal.

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피부장벽에 대한 Bio-Mimic Liquid Crystal Emulsion (BLCE)의 긍정적 효과에 관한 연구 (Study on the beneficial effect of Bio-Mimic Liquid Crystal Emulsion (BLCE) on Skin Barrier Function)

  • 안영훈;배순민;정진교;황정근
    • 대한화장품학회지
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    • 제33권4호
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    • pp.227-230
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    • 2007

  • 최근 기능성화장품과 피부관련 의약품 분야에서 multi-lamellar와 liquid crystal의 구조가 커다란 관심을 끌고 있다. 결합수와 고정된 유상을 함유하는 multi-lamellar 구조는 피부의 세포간지질의 lamellar 구조의 재건과 보습을 유지하는 작용으로써 보습기능이나 장벽기능의 복구에 우수하며, 이 지질들은 각질층에 침투하여 유지된다. 본 연구에서 고급 지방 알코올, 레시틴, 콜레스테롤을 사용하여 제조한 bio-mimic liquid crystal emulsion (BLCE)의 피부장벽 기능을 측정하였고 일반적인 계면활성제와 세포독성을 비교하였다.

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결정질AZO 박막과 비정질IGZO 박막의 결정구조와 결합에너지와의 상관성 (A Study on the Chemical Properties of AZO with Crystal Structure and IGZO of Amorphous Structure Due to the Annealing Temperature)

  • 소영호;송정호;서동명;오데레사
    • 산업진흥연구
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    • 제1권1호
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    • pp.1-6
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    • 2016

  • 산화물반도체의 결정질특성과 비정질특성을 이해하기 이하여 AZO 박막과 IGZO 박막을 증착하고 열처리하여 물리적 화학적인 특성을 비교하였다. AZO 박막은 열처리온도가 올라갈수록 결정성이 높아졌으나 IGZO 박막은 열처리온도가 높을수록 비정질특성이 우수하였다. AZO 박막은 열처리에 따라서 PL, XPS 분석에서 화학적 이동이 나타났으나 IGZO 박막은 화학적 이동이 나타나지 않았다. AZO의 O 1s 결합 에너지는 531.5 eV였으며, IGZO 박막은 530 eV으로 낮았다.

  • https://doi.org/10.21186/IPR.2016.1.1.001 인용 PDF

열 스트레스에 의한 비닐절연전선의 탄화 패턴 및 결정 구조의 변화 (Variation of Carbonization Pattern and Crystal Structure of Polyvinyl Chloride Wire Under the Thermal Stresses)

  • 최충석;김향곤
    • 전기학회논문지P
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    • 제57권3호
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    • pp.332-337
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    • 2008

  • We analyzed carbonization pattern and crystal structure of polyvinyl chloride wire by thermal stress. Copper that is oxidized at normal temperature is a reddish brown. If under the thermal stress range of 500 to 700 [$^{\circ}C$], carbonization and exfoliation occurrence. Section structure of electric wire is same as arrangement of particle in metallograph analysis. But, as thermal stress increases, size of particle is enlarged. Electric wire displays elongation structure in SEM image analysis and elongation structure collapses when receive thermal stress at 300 [$^{\circ}C$]. In EDX analysis, we get the spectra of CuL, CuK, OK, and ClK. FT-IR analysis was shown new spectra with in range of $1,440{\sim}1,430\;[cm^{-1}]$, 1,340 [$cm^{-1}$], 1,240 [$cm^{-1}$].

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