• Advances in nano research
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• 제13권5호
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• pp.437-451
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• 2022

Synthesis approaches usually affect the physical and chemical properties of ferrites. This helps ferrite materials to design them for desired applications. Some of these methods are mechanical milling, ultrasonic method, micro-emulsion, co-precipitation, thermal decomposition, hydrothermal, microwave-assisted, sol-gel, etc. These methods are extensively reviewed by taking example of ZnFe₂O₄. These methods also affect the microstructure and local structure of ferrite which ultimately affect the physical and chemical properties of ferrites. Various spectroscopic techniques such as Raman spectroscopy, Fourier Transform Infrared spectroscopy, Ultra Violet-Visible spectroscopy, Mossbauer spectroscopy, extended x-ray absorption fine structure, and electron paramagnetic resonance are found helpful to reveal this information. Hence, the basic principle and the usefulness of these techniques to find out appropriate information in ZnFe₂O₄ nanoparticles is elaborated in this review.

• 대한화학회지
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• 제48권1호
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• pp.107-110
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• 2004

• 생약학회지
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• 제25권3호
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• pp.199-203
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• 1994

Chemical examination of the leaves of Betula platyphylla var. latifolia has led to the isolation and characterization of five flavonoid glycosides including two C-glucosyl flavonoids. The structures of these compounds were elucidated as myricetin $3-O-{\alpha}-_L-rhamnoside$ (myricitrin), $quercetin-3-O-{\beta}-_D-glucopyranoside$ (isoquercitrin), $quercetin-3-O-{\beta}-_D-glucopyranoside$ (hyperoside), $nalingenin-6-C-{\beta}-_D-glucopyranoside$ (hemiphloin) and $aromadendrin-6-C-{\beta}-_D-glucopyranosidre(6-C-glucosyldihydrokaempferol)$ on the basis of physico-chemical and spectroscopic evidences.

• 통합자연과학논문집
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• 제10권4호
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• pp.197-201
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• 2017

Organosilicon compound containing silphenylene unit as an eletrolyte for the application of lithium-ion batteries was synthesized by hydrosilylation method between 1,4-bis(dimethylsilylhydro)benzene and 3-[2-(2-methoxyethoxy)ethoxy]-1-propene. As-prepared new organosilicon compounds containing spacer such as propyl group with ethylene glycol are synthesized to improve thermal stability and to promote conductivity. The products are characterized by spectroscopic analysis.

• Natural Product Sciences
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• 제19권3호
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• pp.227-230
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• 2013

One new iridoid glycoside, 10-p-dihydrocoumaroyl-6-${\alpha}$-hydroxygeniposide (1), and six known iridoid glycoside derivatives, 10-p-dihydrocoumaroyl deacetylasperuloside (2), asperulosidic acid methylester (3), asperuloside (4), asperulosidic acid (5), deacetylasperuloside (6), and scandoside (7) were isolated from the methanolic extract of the whole plant of Galium verum var. asiaticum Nakai (Rubiaceae) through repeated column chromatography. Their chemical structures were characterized by spectroscopic analysis. This is the first report of the characterization of compounds 1 - 7 from this plant.

• 통합자연과학논문집
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• 제2권2호
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• pp.69-72
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• 2009

Pentiptycenediacetylene is very useful precursor materials for the synthesis of conducting polymer materials. The incorporation of rigid three-dimensional pentiptycene moieties into conjugated polymer backbones would offer several design advantages. They prevent ${\pi}$-stacking of the polymer backbones and thereby maintain high fluorescence quantum yields and spectroscopic stability in thin films. The pentiptycenediactylene was synthesized and characterized by 1H- and 13C-NMR spectroscopy.

• 약학회지
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• 제39권2호
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• pp.200-204
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• 1995

Chemical examination of the leaves of Rubus coreanum has led to the isolation and characterization of six phenolic compounds. The structures of these compounds were elucidated as kaempferol(l), quercetin(2), sodium salt of quercetin 3-O-$\beta$-D-glucuronide(3), sodium carboxylate of quercetin 3-O-$\beta$-D-glucuronide(4), ellagic acid(5) and sanguiin H-5(6) on the basis of physicochemical and spectroscopic evidences.

• Natural Product Sciences
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• 제18권3호
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• pp.195-199
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• 2012

Nine iridoid glycoside derivatives were elucidated from the methanolic extract of the aerial parts of Galium spurium (Rubiaceae) through repeated column chromatography. Their chemical structures were characterized as 10-O-trans-p-coumaroylscandoside (1a), 10-O-cis-p-coumaroylscandoside (1b), 10-O-trans-p-coumaroyl-10-O-deacetyldaphylloside (2), 10-O-cis-p-coumaroyl-10-O-deacetyldaphylloside (3), asperulic acid methylester (4), asperuloside (5), asperulosidic acid (6), scandoside (7), and deacetyl asperulosidic acid (8) by spectroscopic analysis. This is the first report of the characterization of compounds 1a, 1b, 2, 3 and 7 from this plant.

• Bulletin of the Korean Chemical Society
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• 제17권9호
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• pp.836-839
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• 1996

A new copper complex containing 2,2'-dipyridylbenzamide(dpba), Cu(dpba)(NO3)2(CH3CN), has been synthesized and characterized. The crystal structure has been determined. Crystal data: space group P212121, Z=8, a=13.911(3) Å, b=16.813(3) Å, c=18.932(3) Å, V=4427.9(1) Å3 and R=0.0674 for 1716 reflections. The copper environment is square pyramidal containing acetonitrile in axial site. Spectroscopic properties has been characterized in solution state. The redox property of the Cu(dpba)(NO3)2 complex is different from that of corresponding copper-dpa complex.

• Bulletin of the Korean Chemical Society
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• 제8권4호
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• pp.251-254
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• 1987

The surface-enhanced Raman scattering(SERS) of benzonitrile in a silver sol was investigated. It was concluded that the molecule adsorbed onto the silver surface via the nitrogen lone pair electrons. Using the surface selection rule, the orientation of the benzene ring with respect to the surface plane could not be determined conclusively. However, it seemed likely that benzonitrile is adsorbed edge-on to the surface. It was demonstrated that the SERS technique provides a useful method for detailed characterization of the chemisorbed layer.