• 제목/요약/키워드: $Zn^{2+}$ complex

검색결과 335건 처리시간 0.039초

Solvent Extraction of Zinc from Strong Hydrochloric Acid Solution with Alamine336

  • Lee, Man-Seung;Nam, Sang-Ho
    • Bulletin of the Korean Chemical Society
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    • 제30권7호
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    • pp.1526-1530
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    • 2009
  • Solvent extraction reaction of Zn(II) by Alamine336 from strong HCl solution up to 10 M was identified by analyzing the data reported in the literature. The equilibrium constant of this reaction was estimated by considering the complex formation between zinc and chloride ion. The necessary thermodynamic parameters, such as equilibrium constant for the formation of complexes and the interaction parameters, were evaluated from the thermodynamic data reported in the literature. The following solvent extraction reaction and the equilibrium constant was obtained by considering the activity coefficients of solutes present in the aqueous phase with Bromley equation. $Zn^{2+}\;2Cl^{-}\;+\;R_3NHCl_{org}\;=\;ZnCl_3R_3NH_{org},\;K_{ex}\;=\;6.33\;{\times}\;10^2$ There was a good agreement between measured and calculated distribution coefficients of Zn(II).

Protonation and Stability Constants for $Co^{2+},\;Ni^{2+},\;Cu^{2+},\;and\;Zn^{2+}$ of the Open-Chain Polyamine 1-Amino-13-(2-pyridyl)-3,6,9,12-tetraaza-tridecane. Crystal Structure of Its Nickel(Ⅱ) Complex

  • 김선덕;김준광;정우식
    • Bulletin of the Korean Chemical Society
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    • 제18권6호
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    • pp.653-656
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    • 1997
  • The new unsymmetric $N_6$ ligand 1-amino-13-(2-pyridyl)-3,6,9,12-tetraazatridecane (aptatd) containing one pyridyl group has been synthesized and characterized by EA, IR, and NMR. Its proton association constants $(log K_H^n)$ and stability constants $(log K_{ML})$ for Co(Ⅱ), Ni(Ⅱ), Cu(Ⅱ), and Zn(Ⅱ) ions were determined at 298.1 K and ionic strength 0.100 mol $dm^{-3}$ (KNO₃) in aqueous solution by potentiometry: log $K_H^1$=8.80, log $K_H^2$=8.49, log $K_H^3$=6.84, log $K_H^4$=4.17, log $K_H^5$=3.47; log $K_{ML}(Co^{2+})$=18.00, log $K_{ML}(Ni^{2+})$=21.31, log $K_{ML}(Cu^{2+})$=23.62, log $K_{ML}(Zn^{2+})$=15.60. The X-ray structure of its nickel(Ⅱ) complex [Ni(aptatd)]$(ClO_4)_2$ are reported: orthorhombic space group Pbca, a=15.715(1) Å, b=14.280(2) Å, c=19.443(2) Å, V=4363.4 (9) ų with Z=8. The geometry around nickel is a distorted octahedron with the pyridine nitrogen atom being cis to the nitrogen atom of the terminal primary amine.

Effects of Salmonella typhymurium Lipopolysaccharide Challenge on the Performance, Immune Responses and Zinc Metabolism of Laying Hens Supplemented with Two Zinc Sources

  • Cheng, Tingshui;Guo, Yuming
    • Asian-Australasian Journal of Animal Sciences
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    • 제17권12호
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    • pp.1717-1724
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    • 2004
  • The study was conducted to determine the effect of Salmonella typhymurium lipopolysaccharide (LPS) challenge on egg-laying performance, inflammatory response, zinc metabolism in layer fed diets supplemented with organic or inorganic zinc since 3-wk-old. The three dietary treatments were corn-soybean meal basal diet without supplemental zinc or with supplemental zinc at 60 mg/kg zinc from $ZnSO_4$ or zinc amino acid complex (ZnAA). At the age of 58 wk-old, twelve hens from each dietary treatment were allotted into two sub-groups. On day 1, 3, 5, 7 of the $58^{th}$ week of age, six birds of one sub-group were injected intraperitoneally (i.p.) with 2 ml LPS (1.0 $\ell$/ml) or sterile saline. Neither zinc source ${\times}$ immune challenge interaction nor zinc source effect on egg production performance was observed (p>0.05), LPS-challenge decreased egg production (p<0.04) and increased percentage of cracked eggs (p <0.01). With LPS challenged, the fever response of hens fed ZnAA peaked and subsided earlier than in hens fed $ZnSO_4$ or basal diet. Serum IL-1$\beta$ at 3 h was higher (p<0.01), but lower (p<0.001) at 12 h post-challenge with LPS in hens fed ZnAA than $ZnSO_4$. In salinetreated groups, serum IL 1$\beta$ was higher in hens fed ZnAA than the basal diet at 3 h post-injection (p<0.01). LPS-challenged birds had lower serum zinc and higher zinc sequestered in liver and spleen (p<0.001). In saline-treated birds, there was no difference in zinc concentration of serum, liver and spleen among different dietary treatments (p>0.05). Supplementation of 60 mg/kg zinc from either ZnAA or $ZnSO_4$ significantly (p<0.05) elevated metallothionein (MT) concentration in liver and spleen. MT concentration in liver of birds fed ZnAA diet was higher than in those fed $ZnSO_4$ diet (p<0.05). The magnitude of increase of hepatic and splenic MT due to LPS challenge was higher by supplementation of ZnAA than $ZnSO_4$. The results suggest that zinc amino acid complex enhanceed MT synthesis and zinc sequestered in liver and spleen and increased the sensitivity to immune response due to LPS challenge.

Isotope-Aided Micronutrient Studies in Rice Production with Special Reference to Zinc Deficiency (II) -Residual Effect of $^{65}Zn$ Labelled Fertilizers-

  • Kim, Tai-Soon;Kim, Jae-Sung;Kim, Jin-Se
    • Nuclear Engineering and Technology
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    • 제11권1호
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    • pp.47-54
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    • 1979
  • 수도(水稻)에 의한 $^{65}$ Zn 표지 및 비표지 아연비료의 잔류(殘留) 효과의 포장실험 결과를 요약하면 다음과 같다. 수량면에서 본 아연비료의 잔효(殘效)는 약간 있었다. 수량에 미치는 아연시비법(施肥法)의 영향을 보면 아연 건층시비가 포층시비 보다 효과가 컸다. 아연 시비 수준별로 본 수량은 5kg Zn/ha 전층 시비가 10, 20kg Zn/ha 건층시비 보다 좋았다. 아연비료 형태별로 수량을 비교해 보면 $^{65}$ ZnSO$_4$ 가 Urea-$^{65}$ Zn 복합비료 보다 좋았다. 이와 같은 경향은 1차년도 실험 결과와 같았다. 수도체(水稻體)의 아연 전 흡수량은 유기물 첨가토양(처리 2와 8)과 Urea-$^{65}$ Zn 복합비료 시용구에서는 전년도 보다 현저하게 증가되었다. 수도체의 % Zndff값은 전년도에 얻어진 값 보다 훨씬 감소되었다. 수도체의 비료 아연 흡수량은 대부분의 아연 처리구에서 전년도 보다는 약간 감소되었으나 유기물 시용토양에 아연을 전층시비했을 때와 Urea-$^{65}$ Zn 복합비료 시용구에서는 전년도의 값 보다는 오히려 증가되었다. 아연 전층시비법은 표층시비법 보다 수도체의 비료 아연 흡수량은 많았다. 수도체의 전아연 흡수량에 대해서 비료에 유래된 아연의 기여율은 4.6%-24.3% 범위하였다. 5kg Zn/ha 수준에서 $^{65}$ Zn 표지 아연 비료의 이용 효율은 0.213%-0.58%였다.

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인공핵산 분해효소로서 몇 가지 유기금속 화합물들의 생물활성 (Biological activities of some organometalic compounds as artificial nuclease)

  • 성낙도;김대황;권병목;김태영;서일환
    • 농약과학회지
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    • 제4권1호
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    • pp.32-37
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    • 2000
  • 인공핵산 분해효소로서 일련의 3,6-bis(6'-methyl-2'-pyridyl)pyridazine, ($L^{1}$)과 3,6-bis-(2'-pyridyl)pyridazine, ($L^{2}$)을 리간드로 한 몇가지 전이금속 착화합물, $1{\sim}8$을 합성하여 X-ray 결정구조를 확인한 다음, 핵산 모델 화합물과의 가수분해 반응성을 위시하여 논잡초에 대한 살초활성과 식물성 병원균에 대한 살균활성 등을 각각 검토하였다. 그 결과, $L^{2}$-Zn 착물, 8이 무촉매시 보다 빠른 가수분해 반응성을 나타내었으며, 살초활성에서는 $L^{2}$-Ni(II) 및 Co(II) 착물인 5와 6이 벼 (ORY, Oryzar sativa L.)에 대한 선택성을 나타내었을 뿐만 아니라, 올챙이고랭이(SCP, Scriptus juncoids)에 높은 살초활성을 보였다. 그리고 살균활성에서는 $L^{1}$-Co(II) 및 Zn(II) 착물인 2와 4를 위시하여 특히, $L^{1}$$L^{2}$가 도열병균 MAG (Magnaporthe grisea)에 대하여 90%이상의 살균활성을 나타내었다.

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착체중합법 및 연소합성법에 의한 $ZnGa_{2}O_{4}$ 합성에 관한 연구 (A Study on the Preparation of $ZnGa_{2}O_{4}$ by Polymerized Complex Method and Solution Combustion Method)

  • 전애경;류호진;박희동;이익모
    • 한국재료학회지
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    • 제8권7호
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    • pp.616-620
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    • 1998
  • 착체증합법 및 연소합성법에 의해 Zn_{0.994}Mn_{0.006}Ga_2O_4$녹색형광체 분말을 합성하였으며, 이들의 분말 및 발광특성을 XRD, SEM, BET, PL 등을 사용하여 조사하였고, 이를 고상반응법에 의하여 합성한 시료와 비교하였다. 착체중합법과 연소합성법에 의해 합성한 시료는 각각 $500^{\circ}C$$400^{\circ}C$에서 단일 스피텔 상이 생성되었으며, 이들의 입자크기는 고상반응에 의해 합성된 분말에 비하여 작았다. 한편, 착체중합법에 의하여 합성한 분말의 발광강도는 열처리 온도가 $900^{\circ}C$일 때, 연소합성법에서는 반응온도가 $400^{\circ}C$일 때 각각 최대값을 나타내었다.

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온산공단(溫山工團)주변토양의 중금속(重金屬) 농도조사 (A Survey on the Heavy Metal Concentration of Soil Samples around Onsan Industrial Complex)

  • 이서래;송기준
    • 한국환경농학회지
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    • 제4권2호
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    • pp.88-94
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    • 1985
  • 온산(溫山)공업단지 조성(造成)에 따른 토양(土壤)의 오염(汚染)가능성을 조사하기 위하여 1978년 3월부터 1979년 5월말까지 수차에 걸쳐 공업단지 주변의 전답(田畓), 과수원 및 야산(野山)의 토양시료에 대하여 중금속 원소의 농도를 분석한 결과는 다음과 같다. 1) 농경지통양 46개지점의 중금속 농도(풍건물(風乾物) 기준)는 비소 흔적${\sim}9.3ppm$, 카드뮴 흔적${\sim}$0.6 ppm, 구리4${\sim}$22ppm, 수은 흔적${\sim}$0.37ppm, 납 6${\sim}$43ppm, 아연 27${\sim}$93ppm으로서 전국(全國) 논토양의 분석치와 비교할 때 중금속의 오염은 전혀 인정할 수 없었다. 2) 중금속 함량을 논, 밭, 과수원의 토양별로 비교한 결과 As, Cd, Cu, Zn은 토양에 따라 유의차(有意差)가 없었으나 Hg, Pb는 유의차(有意差)가 있었다. 공단내(工團內) 리단위(里單位)지역에 따른 중금속 함량을 비교한 결과 As, Cd, Hg는 유의차(有意差)가 없었으나 Cu, Pb, Zn은 유의차(有意差)가 있었다. 3) 금속제련소 인접지역에서는 아연제련소(亞鉛製鍊所)의 시운전(試運轉)중 사고에 의하여 Cd, Pb, Zn으로 오염(汚染)된 지점이 여러곳 관찰되었으나 정상가동(正常稼動)에 들어간 이후에는 오염이 더 이상 진행되지 않았다.

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Ruthenium Complex-catalyzed Highly Selective Co-oligomerization of Alkenes

  • Ura, Yasuyuki;Tsujita, Hiroshi;Mitsudo, Take-Aki;Kondo, Teruyuki
    • Bulletin of the Korean Chemical Society
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    • 제28권12호
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    • pp.2139-2152
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    • 2007
  • Ruthenium complex-catalyzed reactions often require highly qualified tuning of reaction conditions with substrates to attain high yield and selectivity of the products. In this review, our strategies for achieving characteristic ruthenium complex-catalyzed co-oligomerization of different alkenes are disclosed: 1) The codimerization of 2-norbornenes with acrylic compounds by new ruthenium catalyst systems of RuCl3(tpy)/Zn [tpy = 2,2':6',2''-terpyridine] or [RuCl2(η6-C6H6)]2/Zn in alcohols, 2) A novel synthesis of 2-alkylidenetetrahydrofurans from dihydrofurans and acrylates by zerovalent ruthenium catalysts, such as Ru(η4-cod)(η6-cot) [cod = 1,5-cyclooctadiene, cot = 1,3,5-cyclooctatriene] and Ru(η6-cot)(η2-dmfm)2 [dmfm = dimethyl fumarate], 3) Regio- and stereoselective synthesis of enamides by Ru(η6-cot)(η2-dmfm)2-catalyzed codimerization of N-vinylamides with alkenes, and 4) Unusual head-to-head dimerization of styrenes and linear codimerization of styrenes with ethylene by Ru(η6-cot)(η2-dmfm)2 catalyst in the presence of primary alcohols.

Zn-Complexes를 이용한 OLEDs의 발광 특성 연구 (Luminance Properties of Organic Light Emitting Diodes Using Zn-Complexes)

  • 장윤기;김두석;김병상;권오관;이범종;권영수
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 제36회 하계학술대회 논문집 C
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    • pp.1890-1892
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    • 2005
  • Recently, high luminance and high efficiency were realized in OLEDs with multilayer structure including emitting materials such as metal-chelate complexes. New luminescent materials, [2- (2-hydroxyphenyl)-quinoline] (Zn(HPB)q), [(1,10-phenanthroline)- (8-hydroxyquinoline)] Zn(Phen)q was synthesized. Zn-Complexes have low molecular compound and thermal stability. The ionization potential(IP) and electron affinity(EA) of Zn-complexes were measured by cyclic-voltammetry(CV). The fundamental structure of the OLEDs was $ITO/{\alpha}$-NPD/Zn-Complex/Al and then we made device structure rightly in energy band gap. We using Zn(Phen)q as emitting layer and Zn(HPB)q as electron transport layer. We measured current density-voltage, luminance-voltage characteristics.

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