• 한국세라믹학회지
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• 제26권4호
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• pp.479-486
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• 1989

According to the phase diagram, 6Bi2O3.GeO2 composition melts congruently at 93$0^{\circ}C$ and forms a stable ${\gamma}$-6Bi2O3.GeO2 crystal phase below the melting point. But when the melt of this composition was cooled at a rate 1-15$0^{\circ}C$/min without tapping by a glass rod or impurity addition, a metastable $\delta$-6Bi2O3.GeO2 crystal phase was formed. It is due to that as the nucleation energy barrier of $\delta$-6Bi2O3.GeO2 crystals, which have more open and defective structure, is lower than that of ${\gamma}$-6Bi2O3.GeO2 crystals. When impurities or ${\gamma}$-6Bi2O3.GeO2 crystals existed in the melt, stable ${\gamma}$-6Bi2O3.GeO2 crystal phase was formed at various cooling rate. It is because of that the impurities or the ${\gamma}$-6Bi2O3.GeO2 crystals role as a seed crystal and as a result the nucleation energy barrier of ${\gamma}$-6Bi2O3.GeO2 crystals is lowered.

• Bulletin of the Korean Chemical Society
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• 제21권6호
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• pp.613-617
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• 2000

p-(2-Vinyloxyethoxy)benzylidenemalononitrile (4a), methyl p-(2-vinyloxyethoxy)benzylidenecyanoacetate (4b), 3,5-dimethoxy-4-(2'-vinyloxyethoxy)benzylidenemalononitrile (5a), methyl 3,5-dimethoxy-4-(2'-vinyloxy-ethoxy) benzylidenecyanoacetate (5 b), o-(2 -vinyloxyethoxy)benzylidenemalononitrile (6a), methyl o-(2-viny-Ioxyethoxy) benzylidenecyanoacetate (6b), 1,3-di-(2',2'-dicyanovinyl)-5-methyl-2-(2'-vinyloxyetioxy)benzene (7a), l,3-di-(2'-carbomethoxy-2'-cyanovinyl)-5-methyl-2-(2'-vinyloxyethoxy)benzene (7b), 2,3,4-tri-(2'-viny-Ioxyethoxy) benzylidenemalononitrile (8a), methyl 2,3,4-tri-(2'-vinyloxyethoxy)benzylidenecyanoacetate (8b), 2,4,6-tri-(2'-vinyloxyethoxy)benzylidenemalononitrile (9a), and methyl 2,4,6-tri-(2'-vinyloxyethoxy)benzyl-idenecyanoacetate(9b) were prepared by the condensation of the corresponding benzaldehyde 1-3 with malononitrile or methyl cyanoacetate, respectively. Vinyl ether monomers 4, 6, and 8 polymerized readily with radical initiators to yield crosslinked polymers 10, 12, and 14. However, compounds 5, 7, and 9 were inert to radical initiators due to the steric hindrance. The resulting polymers 10, 12, and 14 were not soluble in common solvents showing a thermal stability up to $300^{\circ}C$.

• Bulletin of the Korean Chemical Society
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• 제8권5호
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• pp.372-376
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• 1987

Acetone solution of quinoline-8-carbaldehyde reacts with $[Rh(cod)(PPh_3)_2] PF_6$and $[Ir(cod)(PPh_3)_2] PF_6$ to yield $[Rh(NC_9H_6CO)(H)(PPh_3)_2(CH_3COCH_3)] PF_6$ (1) and $[Ir(NC_9H_6CO)(H)(PPh_3)_2(CH_3COCH_3)] PF_6$ (2), respectively. The compound $[Ir(cod)(PPh_3)_2] PF_6$ also reacts with $Ph_2PC_6H_4-o-CHO$ in the acetone / $H_2O$ mixture to give $[Ir(Ph_2PC_6H_4-o-CO)(H)(PPh_3)_2(CH_3COCH_3)] PF_6$ (3). Compounds 1, 2, and 3 were characterized by infrared, $^1H$ NMR, $^{31}P$ NMR spectra and conductivity measurement. The $^1H$ NMR spectra of 1, 2, and 3 support the presence of a terminal hydride that is cis to the phosphine. The IR band of 3 at 2185 $cm^{-1}$, which is assigned to $\nu$(Ir-H), and the hydride cleavage reaction of 3 with $CCl_4$, provide evidence for the Ir-H bond.

• Parasites, Hosts and Diseases
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• 제36권3호
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• pp.207-212
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• 1998

질편모충 7개 분리주 (국내분리주 UT8, KT6, UT-Kim 및 fr-Lee, 외국 분리주 CDC85, IR78 및 NYH286주)의 유전학적 차이점을 관찰하고자 Southemhybridization을 하였다. 탐침 (probe) 은 질편모충 DNA에 있는 반복적인 염기서열을 기초로 하여 337 bp의 탐침을 제작하였다. 질편모충 각 분리주를 클로닝하고 각각의 원충을 따로 배양하여 DNA를 분리하여 제한효소를 처리한 후 전기영동하고 Southemhybridization을 하였다. 질편모충 분리주에 관계엄이 11개 내외의 븐회이 관찰되었다. 콜로니가 2개 형성된 KT8, IR78 및 KT-Lee 분리주에서는 클로닝하기 전의 분리주와 클로닝하여 형성된 콜로니를 배양한 질편모충에서 같은 bandpattem이 관찰되었다. 사용된 모든 질편모충을 bandpattem에 따라 3군으로 나눌 수 있었는데, KT8 분리주는 국내 분리주인 KT6, KT-Kim 분리주와 같은 band pattern을 보여 1 kb, 1,2 kb, 1.6 kb, 1.9 kb, 2.3 kb, 2.7 kb, 3.2 kb, 3.4 kb, 3.8 kb, 4.9 kb 및 6.0 kb의 11개의 공통 분획을 보였다. 외국분리주로 metronidazole에 내성인 IR78 분리주는 국내 분리주인 fr-Lee 분리주와 같은 분획을 보여 1 kb, 1.2 kb, 1.6 kb, 1.8 kb, 2.1 kb, 2.5 kb, 2.7 kb, 2.9 kb, 3.4 kb, 5.0 kb 및 6.0 kb의 분획을 보였으며 IR78과 같이 약제 내성이 있다고 알려진 CDC85의 경우 IR78, KT-Lee 분리주와 비슷한 분획을 보였으나 2.9 kb가 없고 3.2 kb의 분획이 관찰되었다. 세번째 군에 해당되는 NYH286주는 12개의 분획을 보였는데 IR78, KT-Lee 분리주와 유사한 분획을 보였으나 그 차이점 은 6.0 kb 대신 6.2 kb를, 2. 1 kb 대신 2.0 kb와 2.2 kb를 나타냈다. 이상의 결과로 질편모충 여러 분리주의 유전학적 다양성이 관찰되었다.

• 한국미생물·생명공학회지
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• 제1권1호
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• pp.43-50
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• 1973

34종의 Hexachlorophene유도체가 합성되었으며 그 각각의 화합물에 대하여 항균성시험이 행해졌다. 검정균은 세종류의 세균과 무좀균(백성균)을 포함한 5종류의 진균류이다. 시험결과는 1. 2,2'-Methylene bis [$\alpha$-(3,4,6-trichlorophenoxy)-$\beta$-(N,N-diethylamino) propionic acid] 및 2,2'-methylene bis [$\alpha$-3,4,6-trichlorophenoxy)-$\beta$-(N,N-dimethylamino) propionic acid] 는 Sta. aureus와 B.subtilis에 대해 강한 항균작용을 나타냈다. 2. 2,2'-methylene bis [$\alpha$-(3,4,6-trichlorophenoxy)-$\beta$-(m-hydroxy-p-carbozyphenylarnino ) propionic acid]는 특히 진균류의 생장저해작용이 강하며 Trichophyton rubrum 및 Microsporum gypseum에는 2 $\mu\textrm{g}$/$m\ell$의 농도에서 항균성을 가지며, Epidermophyton floccosum Aspergillus niger 및 Aspergillus oryzae에 대해서는 1 $\mu\textrm{g}$/$m\ell$의 농도에서 항균성을 나타냄으로서 Hexachlorophene 항균성의 10배 내지 50배의 항균력을 가진다. 3. 34종류의 합성물질중 원 Hexachlorophene에 비해 5종류의 진균류에 대해 부분적으로나마 강한 항균력을 나타내는 물질은 23종류였고 3종류의 세균에 대해선 13종류였다.

• Archives of Pharmacal Research
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• 제17권3호
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• pp.170-174
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• 1994

We have synthesized various 6-substituted 2-oxo-purine nucleosides from key intemediate, 6-[(4-methylphenylthio)-2-oxo-9(2, 3, 5tri-o-acetyl-$\beta$-D-ribofuanoslyl)]-2, 3- dihydropurine in relatively high yields by one step nucleophilic substitution. Various isoguanosine, xanthosine analogs and other 2-oxo-purine nucleosides containing nitrogen, sulfur and oxygen at C-6 of purine base were easily obtained by this method. The structures of the products were established on the basis of their spectral data studies. And cytotoxicity of resulting synthetic 6-substituted-2-oxo-purine nucleosides against some tumor cell-lines was examined. $Ed_{50}$ values of these synthetic compounds were above $100\;{\mu}g/ml$ except isoguanosine, $N^6$-methyl isoguanosine and thioxanthosine analogs.

• 한국표면공학회지
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• 제53권4호
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• pp.131-137
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• 2020

A series of Dy³⁺, Sm³⁺, and Dy³⁺/Sm³⁺ doped Gd₂WO₆ phosphors were synthesized by the conventional solid-state reaction. The X-ray diffraction patterns revealed that all of the diffraction peaks could be attributed to the monoclinic Gd₂WO₆ crystal structure, irrespective of the type and the concentration of activator ions. The photoluminescence (PL) excitation spectra of Dy³⁺-doped Gd₂WO₆ phosphors contained an intense charge transfer band centered at 302 nm in the range of 240-340 nm and two weak peaks at 351 and 386 nm. Under an excitation wavelength of 302 nm, the PL emission spectra consisted of two strong blue and yellow bands centered at 482 nm and 577 nm. The PL emission spectra of the Sm³⁺-doped Gd₂WO₆ phosphors had a series of three peaks centered at 568 nm, 613 nm, and 649 nm, corresponding to the ⁶G_5/2 → ⁶H_5/2, ⁶G_5/2 → ⁶H_9/2, and ⁶G_5/2 → ⁶H_11/2 transitions of Sm³⁺, respectively. The PL emission spectra of the Dy³⁺- and Sm³⁺-codoped Gd₂WO₆ phosphors showed the blue and yellow emission lines originating from the ⁴F_9/2 → ⁶H_15/2 and ⁴F_9/2 → ⁴H_13/2 transitions of Dy³⁺ and reddish-orange and red emission bands due to the ⁴G_5/2 → ⁶H_7/2 and ⁴G_5/2 → ⁶H_9/2 transitions of Sm³⁺. As the concentration of Sm³⁺ increased from 1 to 15 mol%, the intensities of two PL spectra emitted by the Dy³⁺ ions gradually decreased, while those of the three emission bands due to the Sm³⁺ ions slowly increased, thus producing the color change from white to orange. The CIE color coordinates of Gd₂WO₆:5 mol% Dy³⁺, 1 mol% Sm³⁺ phosphors were (0.406, 0.407), which was located in the warm white light region.

• 한국결정학회지
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• 제15권1호
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• pp.35-39
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• 2004

Two new nickel vanadium borophosphate cluster compounds, $(NH_4)_{10}[Ni(H_2O)_5]_4[V_2P_2BO_{12}]_6{\cdot}nH_2O$ (1) and $(NH_4)_{3.5}(C_3H_{12}N_2)_{3.5}[Ni(H_2O)_6]_{1.25}{[Ni(H_2O)_5]_2[V_2P_2BO_{12}]_6{\cdot}nH_2O$ (2) have been synthesized and structurally characterized. Inter-diffusion methods were employed to prepare the compounds. The cluster anion $[(NH_4)\;{\supset}\;V_2P_2BO_{12}]_6$ is used as a building unit in the synthesis of new compounds containing $Ni(H_2O){^{2+}_5}$ in the presence of pyrazine and 1,3-diaminopropane. Compounds contain isolated cluster anions with general composition ${[Ni(H_2O)_5]_n[(NH_4)\;{\supset}\;V_2P_2BO_{12}]_6}^{-(17-2n)}$ (n = 2, 4). Crystal data: $(NH_4)_{10}[Ni(H_2O)_5]_4[V_2P_2BO_{12}]_6{\cdot}nH_2O$, monoclinic, space group C2/m (no. 12), a = 27.538(2) ${\AA}$, b = 20.366(2) ${\AA}$, c = 11.9614(9) ${\AA}$, ${\beta}$ = 112.131(1)$^{\circ}$, Z = 8; $(NH_4)_{3.5}(C_3H_{12}N_2)_b[Ni(H_2O)_6]_{3.5}{[Ni(H_2O)_5]_2[V_2P_2BO_{12}]_6{\cdot}nH_2O$, triclinic, space group P-1 (no. 2), a = 17.7668(9) ${\AA}$, b = 17.881(1) ${\AA}$, c = 20.668(1) ${\AA}$, ${\alpha}$ = 86.729(1)$^{\circ}$, ${\beta}$ \ 65.77(1)$^{\circ}$, ${\gamma}$ = 80.388(1)$^{\circ}$, Z = 2.

• 한국결정학회지
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• 제12권3호
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• pp.137-140
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• 2001

화합물 PdCl₂(PhC≡N)₂(1) 와 2.6-diisopropylaniline 이 반응하여 trans-[Pd(NH₂-C/sub 6/-H₃-2, 6-i-Pr₂)₂Cl₂] (2)가 합성하였다. 화합물 2의 구조가 분광학적 방법(¹H-NMR, /sup 13/C-NMR, IR) 및 X-ray 회절법으로 규명되었다. 화합물 2의 결정학 자료: 단사정계 공간군 P2₁/n, a=13.532(3)Å, b=5.749(1)Å, c=17.880(4)Å, β=103.84(2)°, Z=2, R(wR₂)=0.0466(0.1226).

• Applied Biological Chemistry
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• 제27권2호
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• pp.64-72
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• 1984

담수답 토양중에서 배양된 Alachlor는 그 분해산물로 1-formyl-2, 3-dihydro-7-ethylindole, 2,6-diethylaniline, 2,6-diethylacetanilide, 2,6-diethyl-N-(methoxymethyl) acetanilide, 2-hydroxy-2', 6'-diethyl-N-(methoxymethyl) acetanilide, 그리고 삼종(三種)의 미확인 화합물을 생성하였다. 환(環)-$^{14}C$ 표식(標識) Alachlor의 사용으로 입증된 바와 같이 토양 현탁액중에서 Alachlor의 수용성 분해산물은 배양기간이 증가함에 따라 증가하였고 Rhizoctonia solani의 배양에서도 유사한 결과를 얻었다. Streptomyces lavendulae Ru3340-8은 주요분해산물로 2-hydroxy-2', 6'-diethyl-N-(methoxymethyl) acetanilide를 최고 25%까지 생성하는 반면 Bacillus brevis IFO 3331, Bacillus cruciviae, 그리고 Pseudomonas putida는 그것을 생성하지 않았다.