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T : 목차정보

Bulletin of the Korean Chemical Society 34건

  1. [국내논문]   Excitation Energy Migration in Multiporphyrin Arrays   피인용횟수: 2

    Hwang, In-Wook (National Creative Research Initiatives Center for Ultrafast Optical Chearacterisitcs Control and Department of Chemistry, Yonsei University ) , Aratani, Naoki (Department of Chemistry and Core Research for Evolutional Science and Technology (CREST), Kyoto University ) , Osuka, Atsuhiro (Department of Chemistry and Core Research for Evolutional Science and Technology (CREST), Kyoto University ) , Kim, Dong-Ho (National Creative Research Initiatives Center for Ultrafast Optical Chearacterisitcs Control and Department of Chemistry, Yonsei University)
    Bulletin of the Korean Chemical Society v.26 no.1 ,pp. 19 - 31 , 2005 , 0253-2964 ,

    초록

    During the last decade, the exploration of nanoscale device and circuitry based on molecules has gained increasing interest. In parallel with this, considerable effort is being devoted to the development of molecular photonic/electronic materials based on various porphyrin arrays. This involves light as an input/output signal and excitation energy migration as a mechanism for signal transmission. Absorption of a photon at the light collector end of the porphyrin array yields the excited state, which migrates among the intervening pigments until reaching the emitter, whereupon another photon is emitted. As a consequence, it is relevant to understand the excitation energy transfer (EET) processes occurring in various forms of porphyrin arrays for the applications as artificial light harvesting arrays and molecular photonic/electronic wires. Since the excitonic (dipole) and electronic (conjugation) couplings between the adjacent porphyrin moieties in porphyrin arrays govern the EET processes, we have characterized the EET rates of various forms of multiporphyrin arrays (linear, cyclic, and box) based on various time-resolved spectroscopic measurements. We believe that our observations provide a platform for further development of molecular photonic/electronic materials based on porphyrin arrays.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  2. [국내논문]   Ab initio MO Study on N-Nitrosoazetidine-2-carboxylic Acid   피인용횟수: 1

    Cho, Kwang-Hwi (Department of Bioinformatics and CAMDRC, Soongsil University)
    Bulletin of the Korean Chemical Society v.26 no.1 ,pp. 32 - 33 , 2005 , 0253-2964 ,

    초록

    During the last decade, the exploration of nanoscale device and circuitry based on molecules has gained increasing interest. In parallel with this, considerable effort is being devoted to the development of molecular photonic/electronic materials based on various porphyrin arrays. This involves light as an input/output signal and excitation energy migration as a mechanism for signal transmission. Absorption of a photon at the light collector end of the porphyrin array yields the excited state, which migrates among the intervening pigments until reaching the emitter, whereupon another photon is emitted. As a consequence, it is relevant to understand the excitation energy transfer (EET) processes occurring in various forms of porphyrin arrays for the applications as artificial light harvesting arrays and molecular photonic/electronic wires. Since the excitonic (dipole) and electronic (conjugation) couplings between the adjacent porphyrin moieties in porphyrin arrays govern the EET processes, we have characterized the EET rates of various forms of multiporphyrin arrays (linear, cyclic, and box) based on various time-resolved spectroscopic measurements. We believe that our observations provide a platform for further development of molecular photonic/electronic materials based on porphyrin arrays.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  3. [국내논문]   Sol-gel Transcription of Novel Low-molecular-weight Hydrogel Assembly Based on 2'-Deoxyuridine into the Silica Structure   피인용횟수: 1

    Jung, Jong-Hwa (Nano Material Team, Korea Basic Science Institute (KBSI) ) , Rim, Jeong-Ah (Nano Material Team, Korea Basic Science Institute (KBSI) ) , Lee, Soo-Jin (Nano Material Team, Korea Basic Science Institute (KBSI) ) , Lee, Hae-Seong (Nano Material Team, Korea Basic Science Institute (KBSI) ) , Park, Sun-Min (National Research Laboratory, Department of Chemistry, Division of Molecular and Life Science, Pohang University of Science and Technology ) , Kim, Byeang-Hyean (National Research Laboratory, Department of Chemistry, Division of Molecular and Life Science, Pohang University of Science and Technology)
    Bulletin of the Korean Chemical Society v.26 no.1 ,pp. 34 - 35 , 2005 , 0253-2964 ,

    초록

    During the last decade, the exploration of nanoscale device and circuitry based on molecules has gained increasing interest. In parallel with this, considerable effort is being devoted to the development of molecular photonic/electronic materials based on various porphyrin arrays. This involves light as an input/output signal and excitation energy migration as a mechanism for signal transmission. Absorption of a photon at the light collector end of the porphyrin array yields the excited state, which migrates among the intervening pigments until reaching the emitter, whereupon another photon is emitted. As a consequence, it is relevant to understand the excitation energy transfer (EET) processes occurring in various forms of porphyrin arrays for the applications as artificial light harvesting arrays and molecular photonic/electronic wires. Since the excitonic (dipole) and electronic (conjugation) couplings between the adjacent porphyrin moieties in porphyrin arrays govern the EET processes, we have characterized the EET rates of various forms of multiporphyrin arrays (linear, cyclic, and box) based on various time-resolved spectroscopic measurements. We believe that our observations provide a platform for further development of molecular photonic/electronic materials based on porphyrin arrays.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  4. [국내논문]   The Construction and Use of a Windowless Optical Cell for the Flow Injection Analysis of Chloride Ion   피인용횟수: 1

    Lee, Jae-Ho (Kangwon Science High Scool ) , Han, Mee-Ae (Kangwon Science High Scool ) , Kang, Seong-Woo (Department of Chemistry, Kangwon National University ) , Seo, Seong-Seok (Department of Chemistry, Kangwon National University ) , Hwang, Hoon (Department of Chemistry, Kangwon National University)
    Bulletin of the Korean Chemical Society v.26 no.1 ,pp. 36 - 37 , 2005 , 0253-2964 ,

    초록

    During the last decade, the exploration of nanoscale device and circuitry based on molecules has gained increasing interest. In parallel with this, considerable effort is being devoted to the development of molecular photonic/electronic materials based on various porphyrin arrays. This involves light as an input/output signal and excitation energy migration as a mechanism for signal transmission. Absorption of a photon at the light collector end of the porphyrin array yields the excited state, which migrates among the intervening pigments until reaching the emitter, whereupon another photon is emitted. As a consequence, it is relevant to understand the excitation energy transfer (EET) processes occurring in various forms of porphyrin arrays for the applications as artificial light harvesting arrays and molecular photonic/electronic wires. Since the excitonic (dipole) and electronic (conjugation) couplings between the adjacent porphyrin moieties in porphyrin arrays govern the EET processes, we have characterized the EET rates of various forms of multiporphyrin arrays (linear, cyclic, and box) based on various time-resolved spectroscopic measurements. We believe that our observations provide a platform for further development of molecular photonic/electronic materials based on porphyrin arrays.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  5. [국내논문]   La(III) Selective Membrane Sensor Based on a New N-N Schiff's Base   피인용횟수: 2

    Ganjali, Mohammad Reza (Department of Chemistry, Tehran University ) , Matloobi, Parisa (Department of Chemistry, Tehran University ) , Ghorbani, Maryam (Department of Chemistry, Tehran University ) , Norouzi, Parviz (Department of Chemistry, Tehran University ) , Salavati-Niasari, Masoud (Department of Chemistry, Kashan University)
    Bulletin of the Korean Chemical Society v.26 no.1 ,pp. 38 - 42 , 2005 , 0253-2964 ,

    초록

    Bis(2-methylbenzaldehyde)butane-2,3-dihydrazone(TDSB) was used as new N-N Schiff's base which plays the role of an excellent ion carrier in the construction of a La(III) membrane sensor. The best performance was obtained with a membrane containing, 30% poly(vinyl chloride), 60% benzyl acetate, 6% TDSB and 4% sodium tetraphenyl borate. This sensor reveals a very good selectivity towards La(III) ions over a wide variety of cations, including alkali, alkaline earth, transition and heavy metal ions. The proposed electrode exhibits a Nernstian behavior (with slope of 19.8 mV per decade) over a wide concentration range (1.0 ${\times}$ 10 $^{-5}$ -1.0 ${\times}$ 10 $^{-1}$ M). The detection limit of the sensor is 7.0 ${\times}$ 10 $^{-6}$ M. It has a very short response time, in the whole concentration range ( $\sim$ 5 s), and can be used for at least twelve weeks in the pH range of 3.0-9.4. The proposed sensor was successfully applied as an indicator electrode for the potentiometric titration of a La(III) solution, with EDTA. It was also successfully applied in the determination of fluoride ions in three mouth wash preparations.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  6. [국내논문]   Density Functional Studies of Ring-Opening Reactions of Li+-(ethylene carbonate) and Li+-(vinylene carbonate)   피인용횟수: 2

    Han, Young-Kyu (Computational Chemistry Laboratory, Corporate R & D, LG Chem. Ltd. ) , Lee, Sang-Uck (Computational Chemistry Laboratory, Corporate R & D, LG Chem. Ltd.)
    Bulletin of the Korean Chemical Society v.26 no.1 ,pp. 43 - 46 , 2005 , 0253-2964 ,

    초록

    Reaction energies were determined for reductive ring-opening reactions of Li $^+$ -coordinated ethylene carbonate (EC) and vinylene carbonate (VC) by a density functional method. We have also explored the ring-opening of Li $^+$ -EC and Li $^+$ -VC by reaction with a nucleophile (CH $_3$ O $^-$ .) thermodynamically. Our thermodynamic calculations led us to conclude that the possible reaction products are CH $_3$ OCH $_2$ CH $_2$ OCO $_2$ Li (O $_2$ -C $_3$ cleavage) for Li $^+$ -EC +CH $_3$ O $^-$ ., and CH $_3$ OCHCHOCO $_2$ Li (O $_2$ -C $_3$ cleavage) and CH $_3$ OCO $_2$ CHCHOLi (C $_1$ -O $_2$ cleavage) for Li $^+$ -VC +CH $_3$ O $^-$ .. The opening of VC would occur at the C $_1$ -O $_2$ side by a kinetic reason, although the opening at the O $_2$ -C $_3$ side is more favorable thermodynamically.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  7. [국내논문]   Solvatochromic Fluorescence Behavior of 8-Aminoquinoline-Benzothiazole: A Sensitive Probe for Water Composition in Binary Aqueous Solutions  

    Kim, Young-Hee (Department of Chemistry, Chung-Ang University ) , Youk, Jin-Soo (Department of Chemistry, Chung-Ang University ) , Kim, So-Hee (Department of Chemistry, Chung-Ang University ) , Chang, Suk-Kyu (Department of Chemistry, Chung-Ang University)
    Bulletin of the Korean Chemical Society v.26 no.1 ,pp. 47 - 50 , 2005 , 0253-2964 ,

    초록

    Solvatochromic fluorescence behavior of 8-aminoquinoline based benzothiazole derivative in varying solvent systems has been investigated. Benzothiazole appended 8-aminoquinoline 3 showed distinctive fluorescence color changes depending upon the solvent polarities and the fluorescence color changes occurred over relatively wide span in visible region from 486 nm to 598 nm which can be detected with naked eye. Compound 3 also exhibited significant spectral shifts in ${\lambda}_{em}$ as a function of water composition in binary aqueous solvent systems. The changes are due to the specific interaction of 3 by hydrogen bonding with water as well as general solvent effect. The observed solvatochromic fluorescence characteristics of 3 could be used as a new probe for the micro-environmental polarity changes as well as a sensitive sensor for the determination of water composition in binary aqueous solutions.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  8. [국내논문]   Lead-Selective Poly(vinyl chloride) Membrane Electrode Based on 1-Phenyl-2-(2-quinolyl)-1,2-dioxo-2-(4-bromo) phenylhydrazone   피인용횟수: 3

    Zare, Hamid Reza (Department of Chemistry, Yazd University ) , Ardakani, Mahammad Mazloum (Department of Chemistry, Yazd University ) , Nasirizadeh, Navid (Department of Chemistry, Yazd University ) , Safari, Javad (Department of Chemistry, Kashan University)
    Bulletin of the Korean Chemical Society v.26 no.1 ,pp. 51 - 56 , 2005 , 0253-2964 ,

    초록

    A PVC membrane electrode for lead ion based on 1-phenyl-2-(2-quinolyl)-1,2-dioxo-2-(4-bromo) phenylhydrazone (PQDBP) as ionophore was demonstrated. The optimum composition of the membrane was 30 wt% poly(vinyl chloride), 60 wt% dibutyl phthalate as a plasticizer, 4 wt% ionophore and 6 wt% sodium tetraphenylborate as additive. The electrode exhibits a Nernstian response (28.7 mV decade $^{-1}$ ) for Pb $^{2+}$ over a wide concentration range (1.0 ${\times}$ 10 $^{-1}$ to 1 ${\times}$ 10 $^{-6}$ M) with a detection limit of 6.0 ${\times}$ 10 $^{-7}$ M. This sensor has a short response time and can be used for at least 2 months without any divergence in potentials. The proposed electrode could be used in a pH range of 3.0-6.0 and revealed good selectivities for Pb $^{+2}$ over a wide variety of other metal ions. It was successfully applied as an indicator electrode for the potentiometric titration of lead ion with potassium chromate and for the direct determination of lead in mine.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  9. [국내논문]   The Potentiometric Studies on the Effects of Various Functional Groups in Disiloxane as an Anion-Selective Ionophore  

    Jung, Hyo-Jin (Department of Chemistry, Yonsei University ) , Lee, Myong-Euy (Department of Chemistry, Yonsei University ) , Lim, Chae-Yun (Department of Chemistry, Yonsei University ) , Paeng, Ki-Jung (Department of Chemistry, Yonsei University)
    Bulletin of the Korean Chemical Society v.26 no.1 ,pp. 57 - 62 , 2005 , 0253-2964 ,

    초록

    The potentiometric responses for various anions are investigated with membrane electrode (membrane 1) based on 1,3-diethyl-1,3-dihydroxy-1,3-bis(2-dimethylaminomethyl ferrocenyl) disiloxane. The nitrate ion-selective electrode based on compound 1 gave a good Nernstian response of 58.18 mV per decade for nitrate with the detection limit of ?e5.66 of log [NO3?e]. Compound 1 has all those functional groups and the other two compounds have less functional group of ferrocenyl or ferrocenyl and hydroxide, respectively. Even though, potentiometric response to anions was excellent at pH 5, the selectivity pattern for all three membrane electrode based on series of disiloxane is almost like Hofmeister sequence at pH 5. However, the membrane electrode 1-3 exhibited very different response to anions at pH 7. In this pH, NH2 is not protonated and ionophore may act as neutral carrier. Hydrogen bond may enhance the responsibility to hydrogen acceptors and intramolecular electro-active site may increase the permeability of analyte to ionophore in membrane.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지
  10. [국내논문]   Structural and Bonding Trends among the B7C11-,B6C2, and B5C31+   피인용횟수: 1

    Park, Sung-Soo (Department of Physics, Atmospheric Sciences, and General Science, Jackson State University)
    Bulletin of the Korean Chemical Society v.26 no.1 ,pp. 63 - 71 , 2005 , 0253-2964 ,

    초록

    Equilibrium geometries, electronic structures, and energies of borocarbon clusters (binary compounds of carbon and boron), an unexplored class of molecules with highly unusual characteristics and potential for further development, have been investigated by means of B3LYP/6-311+G $^*$ density functional theory computations. A large number of B $_7$ C ${_1}^{1-}$ , B $_6C_2$ , and B $_5C_{3}\,^{1+}$ clusters with planar and non-planar monocyclic and polycyclic rings, as well as cage structures, have been systematically studied. Unexpectedly, planar forms are predicted not only to be the most stable structures, but also, in many cases, to have unprecedented planar heptacoordinate boron (p-heptaB) and planar heptacoordinate carbon (p-heptaC) arrangements. All these pheptaB and p-heptaC have 6π electrons and are aromatic according to the nucleus independent chemical shift (NICS). This novel bonding pattern is analyzed in terms of natural bond orbital (NBO) analysis. For virtually all possible B $_7$ C ${_1}^{1-}$ , B $_6C_2$ , and B $_5C_{3}\,^{1+}$ combinations, the p-heptaB arrangements are the more stable than other type structures.

    원문보기

    원문보기
    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

    이미지

    Fig. 1 이미지

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