• Title/Summary/Keyword: H-Chelate

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Synthesis of New BF2-Chelate Compounds (새로운 BF2-Chelate 화합물들의 합성)

  • Kim, Jung-Hwan;Kim, Yeung-Eun
    • Journal of the Korean Chemical Society
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    • v.48 no.4
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    • pp.379-384
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    • 2004
  • 4-pyrimidylideneacetonitrile derivatives containing $BF_2$-chelate have been synthesized from H-chelates of 4-pyrimidylideneacetonitrile derivatives and boron trifluoride diethyl etherate. These H-chelates were prepared by the electrophilic substitution of 2-cyanomethylpyridine derivatives with electrophiles such as 4,6-dichloropyrimidine, 4,6-dichloro-2-methylpyrimidine, 4,6-dichloro-2-heptadecylpyrimidine, 4,6-dichloro-2-phenylpyrimidine, 4,6-dichloro-5-phenylpyrimidine and 4,6-dichloro-2,5-diphenylpyrimidine. Structures of the target molecules were identified by spectra methods.

Effect of Copper Chelates(Methionine-Cu, Chitosan-Cu and Yeast-Cu) as the Supplements to Weaning Pig Diet (이유자돈의 사료 첨가제로서 Copper Chelates(메치오닌, 키토산, 효모)의 효과)

  • Kim, B. H.;Lim, H. S.;Namkung, H.;Paik, I. K.
    • Journal of Animal Science and Technology
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    • v.45 no.1
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    • pp.49-56
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    • 2003
  • An experiment was conducted to study the effects of the dietary Cu sources on the performance of the weanling pigs. Forty-eight, 24 in each sex, 4 weeks old pigs were assigned to four treatments; control, methionine-Cu chelate, chitosan-Cu chelate or yeast-Cu chelate. Control diet contained 136ppm Cu to which additional 100ppm Cu in different chelated form was added to the respective treatment. Individual pig weight and feed intake of each pen were recorded weekly for 5 weeks. Average daily feed intakes(ADFI), average daily gains(ADG) and ADFI/ADG were not significantly different among treatments. Nutrient availability was not also significantly affected by treatments. Serum triglyceride concentration of chitosan-Cu treatment was significantly lower than those of methionine-Cu and yeast-Cu treatments but was not significantly different from that of the control. Serum cholesterol concentration of yeast-Cu was significantly lower than those of the control and methionine-Cu but was not significantly different from that of chitosan-Cu treatment. Serum HDL-cholesterol concentration was not significantly affected by treatments. Serum IgG concentrations of all copper treatments were significantly lower than that of the control. It was concluded that Cu-chelates supplemented to the basal diet (136ppm Cu) by the level of 100ppm Cu did not significantly affect growth performance of weaning pigs. However, serum parameters of cholesterol, cholesterol and IgG were significantly affected by the treatments.

Optical Resolution of DABS-Amino Acids with Mobile Chiral Chelate Addition (키랄킬레이트 이동상첨가법에 의한 답실아미노산의 광학이성질체 분리)

  • Lee, Seon Haeng;O, Dae Seop;Byeon, Seong Gu
    • Journal of the Korean Chemical Society
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    • v.34 no.4
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    • pp.345-351
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    • 1990
  • Optical isomers of DABS-amino acids have been separated in a reversed phae high performance liquid chromatography by adding Cu (Ⅱ)-L-Proline chelate to the mobile phase. The retention behaviors for the DABS-amino acids are discussed in terms of pH of the mobile phase and the concentrations of acetonitrile, Cu (Ⅱ) complex, and buffer. The selectivity of the optical isomers of DABS-amino acids increases with the pH of the mobile, and the concentration of the chelate, but decreases with concentration of the oganic modifier. The concentration of buffer does not affect the optical separation selectivity. A separation mechanism is illustrated by cis and trans formation based on the steric effect of the ligand exchange reaction between DABS-amino acids and the copper chelate.

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Synthesis of New 2-Quinazolylacetonitrile Derivatives (새로운 2-Quinazolylacetonitrile 유도체들의 합성)

  • Kim, Jung Hwan;Min, Kyung Su
    • Journal of the Korean Chemical Society
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    • v.45 no.6
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    • pp.532-537
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    • 2001
  • 2-Quinazolylacetonitrile derivatives containing H-chelate have been synthesized from 2-cyanomethylquinazoline using electrophiles such as 4-chloroquinazoline, 4-chloro-2-phenylquinazoline, 4,6-dichloropyrimidine, 4,6-dichloro-2-phenylpyrimidine, 4,6-dichloro-5-phenylpyrimidine, 2-chloroquinoxaline, 1,3-dichloroisoquinoline, 2,6-dichloropyrazine, 2-chloropyrazine and 4,6-dichloro-2,5-diphenylpyrimidine. These H-chelates may serve as a polymethine chromophore system. Structures of the target molecules were identified by spectral methods.

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Effects of Dietary Supplementation of Copper Chelates in the Form of Methionine, Chitosan and Yeast in Laying Hens

  • Lim, H.S.;Paik, I.K.
    • Asian-Australasian Journal of Animal Sciences
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    • v.19 no.8
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    • pp.1174-1178
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    • 2006
  • An experiment was conducted to investigate the effects of dietary supplementation of copper chelates in the form of methionine, chitosan and yeast on the performance of laying hens. Four hundred ISA Brown layers, 84 wks old, were assigned to 4 treatments: control, 100 ppm Cu in methionine chelate (Met-Cu), 100 ppm Cu as chitosan chelate (Chitosan-Cu) and 100 ppm Cu as yeast chelate (Yeast-Cu). Each treatment had five replicates of 20 hens. Hen-day and hen-housed egg production and egg weight were significantly (p<0.05) increased by Met-Cu supplementation. The increase by Chitosan-Cu and Yeast-Cu supplementation was not significant. Contrast of the control vs. Cu chelates showed egg weight was significantly (p<0.05) increased by Cu chelate supplementation. Soft-shell egg production was significantly (p<0.05) reduced by supplementation of Cu chelates. Met-Cu treatment showed the lowest incidence of soft egg production. Gizzard erosion index was increased by Cu chelate supplementation. Crude fat in liver, total cholesterol in yolk and Cu content in liver and yolk were not significantly influenced by Cu chelate supplementation. It was concluded that dietary supplementation of 100 ppm Cu as Met-Cu significantly increased egg production and egg weight. Cu-Met chelate was also effective in reducing soft-shell egg production but increased gizzard erosion index.

Properties and Environmental Effects Estimation of Grout Using Set Accelerating Agent Made From Calcium Aluminate and Viscosity Agent (칼슘알루미네이트계 급결재와 증점제를 사용한 그라우트의 특성 및 환경영향 평가)

  • Heo, Hyung Seok;Yi, Seong Tae;Noh, Jae Ho
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.16 no.4
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    • pp.122-129
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    • 2012
  • In this study, environmental problems(i.e., pH elevation and $Cr^{6+}$ detection) occurred by using the cement grout made from CA(calcium aluminate) were evaluated using viscosity agents(MC, chelate polymer). Ordinary portland cement and blaste-furnace slag cement were used by main materials and ACC(blended mixture of calcium aluminate) were used by accelerator for hardening of grout. In addition, viscosity agents were used for preventing pH elevation and heavy metal detection from grouting materials. From the results, it was noted that when chelate polymer was used, pH elevation and $Cr^{6+}$ detection were minimized. However, other cases showed higher pH elevation and $Cr^{6+}$ detection. At test 1 day, $Cr^{6+}$ detection with age presented over 97% of total value and, after that, additional increase was not distinct. As a result of this study, it was acknowledged that, to control pH elevation and heavy-metal (like $Cr^{6+}$) detection, the usage of BSC and chelate polymer is a very useful fact.

Adsorption Properties of Uranium on Acrylic Fibers Treated with Hydroxylamine (하이드록실 아민으로 처리한 아크릴 섬유의 우라늄 흡착특성)

  • Chin Young Gil;Lee Jung Sook
    • Journal of the Korean Society of Clothing and Textiles
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    • v.14 no.2
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    • pp.98-103
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    • 1990
  • Fibrous adsorbents containing amidoxime group which make chelate complexes with uranyl ions are studied for the recovery of uranium from sea water. Acrylic fibers are used as base Polymer. The adsorption properties of uranium are carried out to examine pH effect, concen-tration dependence, adsorption rate, separation, and chelate complex. The results obtained are as follows; 1. Metal capacity of U (VI) ion is in the range of pH $2\~10.2$. Amidoxime group-containing fiber recover U (VI) ions existed in sea water or waste water in extremely small quantities. 3. Using amidoxime group-containing fiber Cu (II) and U (VI) are separated with each other in dilute nitric acid solution (pH 2.3). 4. U (VI) chelate complexes are conformed by tridendate ligands, which are coordinated with one nitrogen and two oxygens onto amidoxime group-containing fiber.

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Acid Gas Removal Characteristics for Syngas using Fe Oxidization Process (철 산화법을 이용한 합성가스내 산성가스 제거 특성)

  • Lee, Seung-Jong;Hwang, Sang-Yeon;Yoo, Young-Don;Yun, Yong-Seung
    • 한국신재생에너지학회:학술대회논문집
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    • 2007.06a
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    • pp.804-807
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    • 2007
  • The acid gas removal (AGR) system was designed and installed to remove $H_2S$ in coal syngas in the pilot-scale coal gasification system for producing chemicals like Dimethyl Ether(DME). The syngas from the coal gasification at the rate of $100{\sim120$ $Nm^3$/hr included pollutants such as fly ash. $H_2S$, COS, $NH_3$, etc. The designed temperature and pressure of the AGR system are below 50oC and 8 kg/$cm^2$. Fe-chelate was used as an absorbent. $H_2S$ was stably removed below 0.5 ppm in the AGR system when the concentration of $H_2S$ was $150{\sim}450$ ppm. The pH of Fe-chelate solution was also stably maintained between $8{\sim}9$. FeMgO absorbent was also tested to remove $H_2S$ in the lab-scale AGR system and $H_2S$ was also removed below 0.5 ppm in the initial operation.

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Synthesis and Characterization of Molybdeum(V) Complexes (몰리브덴(V) 착물의 합성 및 특성에 관한 연구)

  • Kim, Il-Chool
    • Journal of the Korean Applied Science and Technology
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    • v.18 no.4
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    • pp.254-260
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    • 2001
  • The Mo(V) $di-{\mu}-oxo$ type [$Mo_{2}O_{4}(H_{2}O)_{2}L_{2}$] $SO_{4}$ complexes(L: 2,2'-dipyridyl,4,4'-ethylenedianlline) have been prepared by the reaction of $[Mo_{2}O_{4}(H_{2}O)_{6}]SO_{4}$ with a series of chelate ligands. These complexes are completed by two terminal oxygens arranged trans to one another and each ligand forms a chelate types. In $Mo_{2}O_{4}(H_{2}O)_{2}L_{2}$, two $H_{2}O$ coordinated at trans site of terminal oxygens. The prepared complexes have been characterized by elemental analysis, infrared spectra, $^{1}H$ nuclear magnetic resonance spectra, and thermal analysis(TG-DTA). In the potential range -0.00V to -1.00V at a scan rate of $50mVs^{-1}$, a cathodic peak at -0.81V ${\sim}$ -0.87V (vs SCE) and an anodic peak at -0.61V ${\sim}$ -0.63V (vs SCE) have been observed in aquous solution. We infer these redox are irreversible reaction.