• Title/Summary/Keyword: 크라운에테르

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Binding Properties of Alkali Metal Ions with DBPDA Ion Exchanger (알칼리 금속이온들과 DBPDA 이온교환체와의 결합특성)

  • Kim, Dong Won;Kim Chang Suk;Choi Ki Young;Jeon Young Shin
    • Journal of the Korean Chemical Society
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    • v.37 no.5
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    • pp.491-495
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    • 1993
  • Synthesis of polymer-supported azacrown ether ion exchanger, {(4,5): (13,14)-dibenzo-6,9,12-trioxa-3,15,21-triazazabicyclo[15.3.1]heneicosa-1(21),17,19-triene-2,16-dione : DBPDA ion exchanger}, and its ion binding ability to alkali metal $(Li^+,\;Na^+,\;K^+)$ picrates were studied. The binding constants $(K_b)$ of DBPDA ion exchanger to the alkali metal picrates in ether type solvents were obtained by spectrophotometry. Binding constants of alkali metal ions were in the order to Li < Na < K, and alkali metal ions were formed 1 : 1 complexes with ligands of DBPDA ion exchanger. Also, $K_b$ was found to depend on the variables such as solvent and temperature. The binding constants for the complexes were obtained in the ranges of $2{\times}10^3{\sim}4{\times}10^4M^{-1}$. In order to obtain the enthalpy (${\Delta}$H) and entropy changes (${\Delta}$S)n the complexation process, Kb were plotted against the temperature in the ranges of 10∼40$^{\circ}C$ according to the van't Hoff theory. Enthalphy and entropy changes were found in the ranges of -2.71∼-3.79 kcal/mol, and -16.52∼-20.57 eu, respectively.

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The Effects of $Mg^{2+}$ on the Micelle Formation of Nonionic Surfactants (비이온성 계면활성제의 미셀 형성에 미치는 $Mg^{2+}$의 영향)

  • Kwon, Oh-Yun;Kim, Jung-Sung;Paek, U-Hyon
    • Journal of the Korean Chemical Society
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    • v.37 no.9
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    • pp.781-786
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    • 1993
  • In the presence of $Mg^{2+}$, the interaction of nonionic surfactants, $nonylphenol-(ethylene oxide)_n$[NP-nEO; n = 12, 40, 100] with iodine in aqueous solution were investigated by UV-visible spectrophotometer. CMC (critical micelle concentration) was decreased with increasing $Mg^{2+}$ concentration, and those effects depend upon EO (ethylene oxide) numbers. Above CMC, the intensity of interaction peaks by the addition of $Mg^{2+}$ increased and then decreased. The increase in the intensity of the interaction peaks were attributed to the compactness of micelle in the presence of $Mg^{2+}$. These phenomena may be explained by the fact that the linear ethylene oxide chains, to be free configuration in aqueous solution, could form a psuedo-crown ether structures capable of forming complex with $Mg^{2+}$.

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Enrichment of Lithium Isotope by Novel Ion Exchanger Containing Azacrown Ether as Anchor Group (앵커 그룹으로서 아자크라운 에테르를 포함한 새로운 이온교환체에 의한 리튬 동위원소의 농축)

  • Kim, Dong Won;Lee, Nam-Soo;Jeong, Young Kyu;Ryu, Haiil;Kim, Chang Suk;Kim, Bong Gyun
    • Analytical Science and Technology
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    • v.11 no.4
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    • pp.231-234
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    • 1998
  • Separation factor for $^6Li$ and $^7Li$ has been determined using ion exchange resin having 1,7,13-trioxa-4,10,16-triazacyclooctadecane ($N_3O_3$) as an anchor group. The ion exchange capacity of the $N_3O_3$ ion exchanger was 2.0 meq/g dry resin. The lighter isotope, $^6Li$, is concentrated in the fluid phase, while the heavier isotope, $^7Li$, is enriched in the resin phase. By column chromatography [0.3 cm(I.D)${\times}$30 cm (height)] using 3.0 M ammonium chloride solution as an eluent, single separation factor, ${\alpha}$, 1.018, i.e. $(^7Li/^6Li)_{resin}/(^7Li/^6Li)_{fluid}$ was obtained by the Glueckauf theory from the elution curve and isotope ratios.

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The Effects of $Ca^{2+}$on the Interaction of Nonionic Surfactant with Iodine in Aqueous Solution (수용액 중에서 비이온성 계면활성제와 요오드간의 상호작용에 미치는 $Ca^{2+}$의 영향)

  • Kwon Oh-Yun;Paek U-Hyon
    • Journal of the Korean Chemical Society
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    • v.36 no.5
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    • pp.621-626
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    • 1992
  • The effects of $Ca^{2+}$ ion on the charge transfer(CT) interaction of $4-(C_9H_{19})C_6H_4O(CH_2CH_2O)_{40} [NP-(EO)_{40}]$ with iodine in aqueous solution were investigated by UV-visible spectrophotometer. Maximum absorption wavelengths to the CT interaction were in the vicinity of 390 nm, and by the addition of $Ca^{2+}$ ion shifted toward 370 nm. Above CMC, the intensity of the CT interaction by the addition of $Ca^{2+}$ ion were increased and then decreased. The increase in the intensity of CT band were attributed to the increase of the donor-acceptor overlap with iodine caused by the compactness of micelle in the presence of $Ca^{2+}$ ion. These phenomena suggest that the linear oxyethylene(EO) chains, relatively free to assume various configuration in aqueous solution, could form a pseudo-crown ether structures capable of forming complexes with $Ca^{2+}$ ion.

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Syntheses of New Macrocyclic Crown Ethers Containing Methyl Groups (메틸기를 포함한 새로운 거대고리 크라운 에테르의 합성)

  • Jang, Seung Hyeon;Kim, Dong Jun;Kim, Jae Yong;Lee, Gap Deok
    • Journal of the Korean Chemical Society
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    • v.38 no.3
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    • pp.254-259
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    • 1994
  • Five new crown ethers containing methyl groups were synthesized. 2,3,4,5: 9,10,11,12-Dibenzo-8,8-dimethyl-15,18,1-trioxacycloeicosane, 2,3,4,5: 9,10,11,12-dibenzo-8,8-dimethyl-15,18,21,1-tetraoxacyclotricosane, 2,3,4,5 : 9,10,11,12-dibenzo-8,8-dimethyl-15,18,21,24,1-pentaoxacyclohexacosane, 2,3,4,5 : 9,10,11,12 : 22,23,24,25 : 29,30,31,32-tetrabenzo-8,8,28,28-tetramethyl-15,18,21,35,38,1-hexaoxacyclotetracontane and 2,3,4,5 : 9,10,11,12 : 25,26,27,28:32,33,34,35-tetrabenzo-8,8,31,31-tetramethyl-15,18,21,24,38,41,44,1-octaoxacyclohexatetracontane were synthesized by reaction of 4,4'-isopropylidenediphenol with di-, tri-and tetraethyleneglycol ditosylate in the presence of MOH(M = Na, K). Di-, tri- and tetraethyleneglycol ditosylate were synthesized by reaction of p-toluenesulfonylchloride with diethyleneglycol, triethyleneglycol and tetraethyleneglycol in the presence of NaOH.

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Chiral Separation of Quinolone Antibacterial Agent by Capillary Electrophoresis (모세관 전기 영동을 이용한 퀴놀린계 항생제의 광학 이성질체 분석)

  • Gang, Dae Cheon;Jo, Seung Il;Jeong, Du Su;Choe, Gyu Seong;Kim, Yong Seong
    • Journal of the Korean Chemical Society
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    • v.46 no.5
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    • pp.412-429
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    • 2002
  • Chiral separation of gemifloxacin, an quinolone antibacterial agent, using (+)-(18-crown-6)-tetracar-boxylic acid $(18C6H_4)$ as a chiral selector was performed by capillary electrophoresis (CE). Direct analysis of quinolone antibacterial agent in body fluid is beneficial in terms of fast analysis time, multicomponent analysis. However, high con-centration of sodium ion in body fluid can prevent gemifloxacin from interacting with $18C6H_4$ since sodium ion has high affinity with $18C6H_4$ due to the strong charge interaction. Ethylenediaminetetraacetic acid (EDTA), as a chelating ligand, was added in the running buffer in order to reduce the interaction between sodium ion and the chiral selector. Increased separation efficiency and reduced migration time were observed while sodium ion exists in the sample solution at the concentration up to 150 mM.

The Interaction of Nonionic Surfactant with Iodine in the Presence of $Ca^{2+}$ ($Ca^{2+}$ 존재하에서 비이온성 계면활성제와 요오드와의 상호작용)

  • Park Jeoung-Sun;Kwon Oh-Yun;Paek U-Hyon
    • Journal of the Korean Chemical Society
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    • v.37 no.1
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    • pp.36-42
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    • 1993
  • In the presence of $Ca^{2+}$ ion, the charge transfer (CT) interaction of nonionic surfactants, $nonylphenol-(ethylene oxide)_n\;[NP-(EO)_n; n = 11, 40, 100]$ with iodine in aqueous solution were investigated by UV-visible spectrophotometer. The characteristics of spectra depended on the concentration of $Ca^{2+}$ ion and the number of EO unit. Above CMC, the intensity of the CT band by the addition of $Ca^{2+}$ ion for the $NP-(EO)_{11}$ and $NP-(EO)_{40}$ increased and then decreased, while for the $NP-(EO)_{100}$ continuously increased. The increase in the intensity of CT band were attributed to the compactness of micelle in the presence of $Ca^{2+}$ ion. These phenomena may be explained by the fact that the linear ethylene oxide (EO) chain, to be free configuration in aqueous solution, could form a pseudo-crown ether structures capable of forming complexes with $Ca^{2+}$ ion.

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The Effect of $Ca^{2+}$ on the Interaction of Anionic-Nonionic Surfactant Mixture with Iodine (음이온성-비이온성 혼합계면활성제와 요오드간의 상호작용에 미치는 $Ca^{2+}$의 영향)

  • Oh-Yun Kwon;Jung-Sung Kim;U-Kyon Paek
    • Journal of the Korean Chemical Society
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    • v.37 no.10
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    • pp.855-860
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    • 1993
  • In the presence of SDS(sodium dodecyl sulfate), effect of $Ca^{2+}$on the interaction of NP-40EO[nonylphenol-(ethylene oxide)40] with iodine in aqueous solution were investigated by UV-visible spectrophotometer. In the presence of SDS, the intensity of interaction peaks were decreased and markedly increased by the addition of $Ca^{2+}$. Decrease of interaction peaks is caused by decrease of EO number to be interact with iodine per unit surface area of mixed micelle to the insertion of SDS and increase is attributed to the compactness of micelle in the presence of $Ca^{2+}$. These phenomena may be explained by the fact that the linear EO (ethylene oxide) chains, to be free in aqueous solution, could form a pseudo-crown ether structures of forming with $Ca^{2+}$ion.

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Formation Constants of 18-Crown-6 Complexes with Substituted Potassium Phenoxides (置換 Potassium phenoxide와 이루는 18-Crown-6 Complex의 形成常數)

  • Soo-Dong Yoh;Soon-Kyoo Kim;In-Sook Han;Jong-Hwan Park
    • Journal of the Korean Chemical Society
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    • v.32 no.1
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    • pp.53-59
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    • 1988
  • Recently, the formation of the complexes between macrocyclic polyethers and alkali metal salts have been determined by several methods. It has been suggested that the specificity of the complexation be due to the nature of the surrounding solvent molecules. The formation constant values ($K_f$) of $K^+$ are shown to be the largest among the other alkali metal cations because the ionic diameter of $K^+$ is approximately the same with the hole size of 18-crown-6. In this study the formation constants of the 1 : 1 complexes of 18-crown-6 with potassium p-substituted phenoxide are calculated by the conductance measurement in organic solvents. As a result, the $K_f$ value series among organic solvents are given in the order of $CH_3$OH > DMF > DMSO. It seems that the donor number of the solvent is a main factor in the formation of the complex between $K^+$ metal ion and 18-crown-6 molecules. At the same time, the formation constants increase with increasing the electron-withdrawing power of substituents because the phenoxide ion is stabilized by the charge dispersion.

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Studies on Ion-Selective Crown Ether Dyes (이온선택성 크라운 에테르 염료에 관한 연구)

  • Sam-Woo Kang;Chong-Min Park;Won-Fae Koo;Keun-Jae Kim;Soo-Min Lee;Choo-Hwan Chang
    • Journal of the Korean Chemical Society
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    • v.32 no.5
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    • pp.443-451
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    • 1988
  • New crown ether dye-Ⅰ and dye-Ⅱ having an azo group(-N=N-) were synthesized from monobenzo-15-crown-5 and dibenzo-18-crown-6. These dyes showed ${\lambda}_{max}$ of 377 and 383nm respectively. The complexes of alkali metal ions ($Na^+$, $K^+$, $Cs^+$) with dye ligands showed band shift (390~400nm) and intensity increased. For a given anion, the extraction constants are in the order of $K^+$ < $Cs^+$ < $Na^+$ for dye-Ⅰ and $Cs^+$ < $Na^+$ < $K^+$ for dye-Ⅱ. These results show that the selectivity of crown ethers toward the alkali metal ions is dependant on the charge density of cation and the size of crown ether cavity. For a given cation, the order of the extraction constant is $Cl^-$ < $Br^-$ < $I^-$ < picrate. This order coincides with the degree of anion solvation effect.

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