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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Chosun Natural Science
Journal Basic Information
Journal DOI :
The Research Institute of Chosun Natural Science
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Volume & Issues
Volume 2, Issue 4 - Dec 2009
Volume 2, Issue 3 - Sep 2009
Volume 2, Issue 2 - Jun 2009
Volume 2, Issue 1 - Mar 2009
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Synthesis and Pyrolysis of Inorganic Polymers
Kim, Myoung-Hee ; Lee, Jun ; Mo, Soo-Yong ; Cho, Myong-Shik ; Woo, Hee-Gweon ;
Journal of the Chosun Natural Science, volume 2, issue 3, 2009, Pages 177~184
Selective Reduction of Orgainc Compounds with Al-Fluorodiisobutylalane
Cha, Jin Soon ; Park, Seung Jin ;
Journal of the Chosun Natural Science, volume 2, issue 3, 2009, Pages 185~189
The new MPV-type reagent, Al-fluorodiisobutylalane (DIBAF), has been prepared and their reducing characteristics in the reduction of selected organic compounds containing representative functional groups have been examined in order to find out a new reducing system with unique applicability in organic synthesis. In general, the reagent is extremely mild, showing only reactivity toward aldehydes, ketones, and epoxides. The reagent achives a clean 1,2-reduction of enals to the corresponding allylic alcohols in a 100% purity, but shows no reactivity toward enones. The reagent also shows an excellent regioselective cleavage of substituted epoxides. In addition, DIBAF produces the thermodynamically more stable alcohol epimer in high stereoselectivity in the reduction of cyclic ketones.
Synthesis and Characterization of Bis(silyl) Palladinum and -Platinum(II) Complexes
Cho, Jun-Churl ; Kim, Yong-Joo ;
Journal of the Chosun Natural Science, volume 2, issue 3, 2009, Pages 190~193
Bis(silyl)palladinum(II) and -platinum(II) complexes are key intermediates for the synthesis of organic silyllated compounds by the Pd or Pt-catalyzed reactions. Reactions of dialkylpalladinum and -platinum complexes with diphenylsilane gave the bis(silyl)palladinum and -platinum complexe in moderate to good yields. Isolated complexes were characterized by
-NMR spectroscopy and elemental analyses. Some of the complexes were determined by X-ray crystallographic studies.
Study of Synthesis and Optical Characterization of Amino-functionalized Tetraphenylsilole
Cho, Sungdong ;
Journal of the Chosun Natural Science, volume 2, issue 3, 2009, Pages 194~197
Organometallic containing silole unit has been interested, since silole has a unique optical and electronic properties. The main goal of this work is to develop new selective sensors for organosilicon of 1-methyl-2,3,4,5-tetraphenyl-1H-silole and 1-methyl-1-(3-aminopropyl)-2,3,4,5-tetraphenylsilole based on new silole have been characterized by UV-vis absorption spectroscopy. their optical characteristics have been also investigate using photoluminescence spectroscopy.
Synthesis and Antifungal Activity of Dithiocarbamoic Acid Derivatives
Kim, Ha-Yeon ; Lee, Jong-Dae ;
Journal of the Chosun Natural Science, volume 2, issue 3, 2009, Pages 198~201
Dithiocarbamoic acid and their derivatives were found to readily react with potassium and sodium hydroxide to give the corresponding alkali metal dithiocarbamoic acid derivatives 8-17 in moderate to good yields.
Fabrication of Optically Images Using Nanostructured Photoluminescenct Porous Silicon
Jung, Daehyuk ;
Journal of the Chosun Natural Science, volume 2, issue 3, 2009, Pages 202~206
Optical images based on the porous silicon exhibiting photoluminescence have been prepared from an electrochemical etching of n-type silicon wafer (boron-doped,<100> orientation, resistivity
) by using a beam projector. The images remained in the substrate displayed an optical images correlating to the optical pattern and could be useful for optical data storage. This provides the ability to fabricate complex optical encoding in the surface of silicon.
Intercorrelation between Photonic Band and Etch Current on Rugate Photonic Crystals
Park, Jongsun ; Kim, Yongmin ;
Journal of the Chosun Natural Science, volume 2, issue 3, 2009, Pages 207~210
Multiple rugate structures can be etched on a silicon wafer and placed in the same physical location, showing that many sharp spectral lines can be obtained in the optical reflectivity spectrum. Porous silicon samples were prepared by electrochemical etch of heavily doped p-type silicon wafers. The etching solution consisted of a 3:1 volume mixture of aqueous 48% hydrofluoric acid and absolute ethanol. Galvanostatic etch was carried out in a Teflon cell by using a two-electrode configuration with a Pt mesh counterelectrode. A sinusoidal current density waveform varying between 51.5 and
is applied. The anodization current was supplied by a Keithley 2420 high-precision constant current source which is controlled by a computer to allow the formation of PSi multilayer.
Porous Silicon Microcavity Sensors for the Detection of Volatile Organic Compounds
Park, Cheol Young ;
Journal of the Chosun Natural Science, volume 2, issue 3, 2009, Pages 211~214
A new porous silicon (PSi) microcavity sensor for the detection of volatile organic compounds (VOCs) was developed. PSi microcavity sensor exhibiting unique reflectivity was successfully obtained by an electrochemical etching of silicon wafer. When PSi was fabricated into a structure consisting of two high reflectivity muktilayer mirrors separated by an active layer, a microcavity was formed. This PSi microcavity is very sensitive structures. Reflection spectrum of PSi microcavity indicated that the full-width at half-maximum (FWHM) was of 10 nm and much narrower than that of fluorescent organic molecules or quantum dot. The detection of volatile organic compounds (VOCs) using PSi microcavity was achieved. When the vapor of VOCs condensed in the nanopores, the refractive indices of entire particle increased. When PSi microcavity was exposed to acetone, ether, and toluene, PSi microcavity in reflectivity was red shifted by 28 nm, 33 nm, and 20 nm for 2 sec, respectively.
Synthesis and Photoluminescent Properties of Silaspirotropylidene
Kwon, Yonghee ;
Journal of the Chosun Natural Science, volume 2, issue 3, 2009, Pages 215~218
A silaspirotropylidene has been obtained from the reaction of the lithium salt of tetraphenylsilole dianion with 2 equiv of diphenylcyclopropene, followed by quenching with Me3SiCl. Silaspirotropylidene exhibits an unusual optical property its optical property was characterized by UV-vis and fluorescence spectroscopy. Absorption wavelength maxima of silaspirotropylidene was 420 nm. silaspirotropylidene displayed an emission band at 550 nm with excitation wavelength of 420 nm.
Easy and Simple Synthesis of CdSe Nanocrystals: The Effect of Reaction Temperature for The Determination of Nanoparticle Size
Kim, Sungjin ;
Journal of the Chosun Natural Science, volume 2, issue 3, 2009, Pages 219~223
Easy and simple synthesis of CdSe nanocrystals was achieved through sol-gel process. CdSe nanocrystals were synthesized from the reaction of cadmium oxide and selenium in the prescence of trioctylphosphine oxide, tributylphosphine, octadecene, octadecylamine, and stearic acid. The effect of reaction temperature for the determination of size of CdSe nanocrystals was investigated after the addition of selenium. The reaction temperature for the growth of CdSe nanocrystals was increased by every
from 170 to 190, 210, 230, 250, 270, and
. When the reaction temperature was higher, the absorption wavelength in the absorption spectrum was increased which indicated that the size of CdSe nanocrystals was increased. The emission wavelength in the photoluminescence spectrum was increased from 438 to 489, 542, 591, 643, 692, and 745 nm, as the size of CdSe nanocrystals was increased. The control of the reaction temperature illustrated that the color tuning of emission wavelength were successfully obtained.