• 제목/요약/키워드: Charge transfer complex

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아민과 有機할로겐 化合物間의 Charge Transfer Complex 形成에 關한 硏究 (I) (Charge Transfer Complex Formation of Amines with Organic Halides (I))

  • 김유선;오정희
    • 대한화학회지
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    • 제11권4호
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    • pp.121-125
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    • 1967
  • 各種 아민과 할로겐化合物間의 Charge Transfer Complex 形成與否를 檢討하여 보았다. Pyridine Tridthylamine, Piperidine Ethanolamine Triethanolamine, Aniline, Diethylamine 等의 아민類와 四鹽化炭素 또는 클로로폼의 混合溶液을 n-Hexane 溶媒存在下에서 紫外線吸收 스펙트라를 檢査한 結果 장파장쪽의 Shift가 있었으며 特히 Diethylamine과 Triethylamine은 클로로폼 또는 四鹽化炭素와 1:1 Charge Transfer Complex를 形成하였고, Piperidine은 接觸的 Complex를 形成하는 것이 確認되었다. Complex의 形成경향과 아민의 Nucleophilicity와의 關係를 論議하였다.

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아민과 有機할로겐 化合物間의 Charge Transfer Complex 形成에 關한 硏究 (II) Electron Acceptor 에 따른 Charge Transfer Complex 形成能에 關한 硏究 (Charge-Transfer Complex Formation of Amines with Organic Halides (II) Complex Forming Tendency by Various Electron Acceptors)

  • 김유선;오정희
    • 대한화학회지
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    • 제11권4호
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    • pp.126-131
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    • 1967
  • 各 種 아민(triethylamine, diethylamine, pyridine, diphenylamine, dimethylaniline)과 各種 Electron Acceptor($CCl_4,\;ICl,\;I_2$)를 Hexane 溶媒 存在下에서 作用시킨 結果 各各 Charge Transfer Complex를 形成하였으나 그 形成能은 아민의 Basicity에 比例하였고 Electron Donor의 Polarity의 差가 클 때에는 다른 形式의 Complex를 形成함을 紫外線 吸收 分光法으로 確認하였다. Complex 形成能과 아민의 Basicity 및 Electron Acceptor의 Polarity의 關係를 論하였다.

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Aflatoxin $B_1$ Charge-transfer Complex에 관(關)한 연구(硏究) -제1보(第一報) Benzene과의 Charge-transfer Complex- (Studies on the Charge-transfer Complex including Aflatoxin $B_1$ -Part I. Charge-transfer Complex with Benzene-)

  • 노익삼;이강흡
    • Applied Biological Chemistry
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    • 제17권2호
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    • pp.143-148
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    • 1974
  • Aflatoxin $B_1$은 전자수용성(電子受容性)을 높여주는 염화아연(鹽化亞鉛) 존재하(存在下)에서 전자공여성분자(電子供與性分子)인 Benzene과 Charge-transfer Complex를 만들며, 그 생성기구(生成機構)는 Aflatoxin $B_1$이 염화아연(鹽化亞鉛)과 일차적(一次的)으로 배위결합(配位結合)된 화합물(化合物)을 거쳐, 이것이 Benzene과 결합(結合)하여 착물(錯物)을 형성(形成)한다. 이 착물(錯物)의 안정도상수(安定度常數) 즉(卽) 평형상수(平衡常數) 0.198 l/mole이었다. 따라서 Aflatoxin $B_1$은 약(弱)한 전자수용체(電子受容體)이나, Benzene 보다 강(强)한 전자공여체(電子供與體)와는 염화아연(鹽化亞鉛)이 존재(存在)하지 않아도 Charge-transfer Complex를 만들 수 있다는 가능성(可能性)을 제시(提示)해 주는 것이며, Tryptophane, Histidine과 같은 강(强)한 전자공여체(電子供與體)를 함유(含有)한 단백질(蛋白質) 또는 Guanine, Adenine과 같은 전자공여체(電子供與體)를 함유(含有)한 DNA등(等)과의 Aflatoxin $B_1$의 결합(結合)은 그 결합(結合) Mechanism으로서 Charge-transfer Complex 형성(形成)으로 이루어진다는 추정(推定)을 할 수 있다.

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Phenothiazine과 Quinone계 분자간 전하 이동형 색소의 합성 및 광 퇴색 (Syntheses and Photofading of Intermolecular Charge-Transfer Complex Dyes of Phenothiazine and Quinonoid Compounds)

  • 김성훈;이순남;임용진
    • 한국염색가공학회지
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    • 제4권2호
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    • pp.64-68
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    • 1992
  • The charge-transfer(CT) complexes derived from phenothiazine as donor and quinonoid compounds as accepters were evaluated as coloring matter. Light fastness of the intermolecular charge-transfer(CT) complex dyes as well as absorption wavelength is an important factor when the complexes are applied to coloring matters. The photofading mechanism of CT complex dyes of phenothiazine and accepters were examined. The addition of effective radical scavenger, antioxidant and photostabilizer gave a remarkable enhancement of the photostability of CT dyes.

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Photoinduced Charge-Transfer Association of Tetracyanoquinodimethane with Aminobiphenyls

  • Kim, Yong-Hee;Jung, Sang-Don;Chung, Myung-Ae;Song, Ki-Dong;Cho, Dae-Won
    • Bulletin of the Korean Chemical Society
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    • 제29권5호
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    • pp.948-952
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    • 2008
  • The molecular association of acceptors with electron donors is studied in the highly-polar solvent $CH_3CN$. Tetracyanoquinodimethane (TCNQ) forms a stable charge-transfer complex with donor molecules such as 4- aminobiphenyl (4-AB), benzidine (BD) and 2-aminobiphenyl (2-AB) with high association constants. The complexes of TCNQ with 4-AB or BD show new absorption bands at around 800 and 500 nm, which can be identified as reduced $TCNQ^{{\bullet}-}$ and $TCNQ^{2-}$ species, respectively. These bands grow quickly upon photoirradiation, implying that the charge-transfer complexes are easily formed in an excited state. Conversely, a small spectral manifestation of the charge transfer was observed in the case of 2-AB complex. It is demonstrated that the structural orientation between the geminate ion pairs could play an important role in building a stable complex.

Charge-Transfer Complexing Properties of 1-Methyl Nicotinamide and Adenine in Relation to the Intramolecular Interaction in Nicotinamide Adenine Dinucleotide (NAD$^+$)

  • Park, Joon-woo;Paik, Young-Hee
    • Bulletin of the Korean Chemical Society
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    • 제6권1호
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    • pp.23-29
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    • 1985
  • The charge-transfer complexing properties of 1-methyl nicotinamide (MNA), an acceptor, and adenine, a donor, were investigated in water and SDS micellar solutions in relation to the intramolecular interaction in nicotinamide adenine dinucleotide ($NAD^+$). The spectral and thermodynamic parameters of MNA-indole and methyl viologen-adenine complex formations were determined, and the data were utilized to evaluate the charge-transfer abilities of MNA and adenine. The electron affinity of nicotinamide was estimated to be 0.28 eV from charge-transfer energy $of{\sim}300$ nm for MNA-indole. The large enhancement of MNA-indole complexation in SDS solutions by entropy effect was attributed to hydrophobic nature of indole. The complex between adenine and methyl viologen showed an absorption band peaked near 360 nm. The ionization potential of adenine was evaluated to be 8.28 eV from this. The much smaller enhancement of charge-transfer interaction involving adenine than that of indole in SDS solutions was attributed to weaker hydrophobic nature of the donor. The charge-transfer energy of 4.41 eV (280 nm) was estimated for nicotinamide-adenine complex. The spectral behaviors of $NAD^+$ were accounted to the presence of intramolecular interaction in $NAD^+$, which is only slightly enhanced in SDS solutions. The replacement of nicotinamide-adenine interaction in $NAD^+$ by intermolecular nicotinamide-indole interaction in enzyme bound $NAD^+$, and guiding role of adenine moiety in $NAD^+$ were discussed.

Charge Transfer Complexing Between Indole Derivatives and Methylviologen and Effects of Sodium Dodecyl Sulfate on It

  • Joon Woo Park;Sung-Jin Kim
    • Bulletin of the Korean Chemical Society
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    • 제5권3호
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    • pp.121-126
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    • 1984
  • The charge transfer complex formations between indole derivatives and methylviologen were investigated spectroscopically. In aqueous solutions near room temperature, the order of complex stability was tryptamine < tryptophan < indole < indole acetate, which is the reverse order of the magnitude of molar absorptivities. This was interpreted as involvement of contact charge transfer. The decrease of enthalpy of complex formation (-${\Delta}$H) was highest in tryptamine, and lowest in indole acetate. ${\Delta}$H and entropy of complex formation (${Delta}$S) varied nearly in a linear fashion with isokinetic temperature $242^{\circ}$K. These results were attributed to the hydration-dehydration properties of the side chains in indole derivatives. Except indole acetate, the complex formations were greatly enhanced by the addition of sodium dodecyl sulfate(SDS). However, the direct relationship between the enhanced complex formation and SDS micelle formation was not found. The enhanced charge transfer interaction inSDS solutions was attributed to the increased ${\Delta}$S by interaction between methylviologen and SDS in premicellar level. The order of complex stability in SDS solutions was indole acetate < tryptophan < trypamine < indole, which reflects the hydrophobicity of indole derivatives as well as electrostatic interaction between indole derivatives and methylviologen associated with SDS.

Furfuryl유도체와 하라이드 사이의 Complex형성능 (Formation of a complex between furfuryl derivatives and halides)

  • 김유선;오명원;도재범
    • 대한화학회지
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    • 제14권3호
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    • pp.221-228
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    • 1970
  • The tendency of forming a charge transfer complex between furfuryl derivatives (2-methyl furan, furfuryl acetate, and Ethyl 2-furoate) and halides(Iodine, Iodine monochloride, and Trichloro bromo methane) was studied by means of ultra violet spectrophotometry. In case of furfuryl acetate the formation of the complex could not be distinctly detected by this method. Iodine and trichloro bromo methane could show a distinct formation of charge transfer complex in the U.V. region, whereas iodine monochloride shows a possibility of forming an addition compound rather than the charge transfer complex itself. The results were discussed in conjunction with the stability of the furfuryl ring.

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유기전하이동착체 랭뮤어-블로젯 초박막의 광전도 특성 (Photoelectric Properties of Organic Charge Transfer Complex Langmuir-Blodgett Ultra Thin Films)

  • 정순욱
    • 한국응용과학기술학회지
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    • 제18권1호
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    • pp.49-54
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    • 2001
  • Ultra-thin films of organic charge transfer complex were prepared on a hydrophilic substrate by Langmuir-Blodgett(LB) technique. In this study, the photoelectric properties of a LB film consisting of (N-docosyl quinolinium)-TCNQ(1:2) complex was investigated. The visible light(${\lambda}$ : 700 nm) of xenon lamp was illuminated on the LB films and light absorptivity and photoconductivity were observed. The photocurrent increased linearly and was saturated at the light intensity of 23 ${\mu}W/cm^{2}$.

Study of Solvent Effects in Diels-Alder Reaction through Charge Transfer Formation by Using Semi-empirical Calculations

  • Shihab, Mehdi Salih
    • Bulletin of the Korean Chemical Society
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    • 제29권10호
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    • pp.1898-1904
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    • 2008
  • Study of computational model of the concerted Diels-Alder reaction between 9,10-dimethyl anthracene (as donor) and tetracyanoethylene (as acceptor) in absence and in presence of aromatic solvents (benzene, mesitylene and hexamethylbenzene, as donors) using an AM1 semi-empirical method. AM1 method used to study the neutral charge transfer complex models that could be expected between donor and acceptor during the course of the concerted Diels-Alder reaction. Calculated enthalpies of reaction of the charge transfer complexes models showed physical and chemical meaning for explain the effect of aromatic solvents on the kinetic process of concerted Diels-Alder reaction that contains tetracyanoethylene.