• Journal of the Korean Chemical Society
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• v.55 no.3
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• pp.412-417
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• 2011

A series of homobinuclear complexes of the type [$M_2L(NO_3)_n(H_2O)_m$] where M=$UO_2$(VI), ZrO(IV), Th(IV); L=3-benzylidine-imino-5-p-sulphonamido phenyl azo-2-thiohyatoin(bispt), 3-furfurylidine-imino-5-p-sulphonamido phenyl azo-2-thiohydantoin(fispt),3-pyridyl-2'-methylene-imino-5-p-sulphonamido phenyl azo-2-thiohydantoin(pmispt) and 3-thienyl-2'-methylene-imino-5-p-sulphoanamido phenyl azo-2-thiohydantoin(tmispt); n=8 for Th(IV) and 4 for others, m=4 for bispt and 3 for others have been synthesized and characterized on the basis of elemental analysis, thermal analysis, molar conductance, magnetic moment and spectroscopic data (IR, electronic and $^1H$-NMR). In the light of this information, the ligands can be visualized as tetradentate co-ordinating through azomethine nitrogen, carbonyl oxygen to one metal centre where as azo nitrogen and thioimido nitrogen to the other metal centre yielding homo binuclear complexes of the above composition. The fungi toxicity of the ligands & their zirconyl complexes against some fungal pathogen has been studied.

• Analytical Science and Technology
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• v.11 no.1
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• pp.8-12
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• 1998

The 2,2'-Biimidazole was synthesized by the reaction between glycol and ammonium solution. The correct solid structure of 2,2'-biimidazole in this method reported either trans ($C_{2h}$) or cis ($C_{2v}$) form. In this study, the correct structure of 2,2'-biimidazole was analysed by both FTIR and Raman spectroscopy using mutual exclusion properties of them. Also, it was analysed by $^1H$ and $^{13}C$ NMR and computer molecular modeling. The structure of 2,2'-biimidazole found to be trans ($C_{2h}$) than cis ($C_{2v}$) by comparison between FTIR and Raman Spectra. This results agree with computer molecular modeling and x-ray crystallography. This study provide good evidence for identifying structural orientation of the 2,2'-biimidazole containing pyridyl nitrogen.

• Journal of the Korean Chemical Society
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• v.35 no.5
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• pp.493-499
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• 1991

The circular dichroism (CD) spectrum of trans-[Co(R,R-chxn)$_2Cl_2]^+$ complex with different counter-ions have been measured in several organic solvents, where R,R-chxn is (1R,2R)-1,2-diaminocyclohexane. The observed variations in the CD spectrum of the complex exhibited remarkable solvent dependences. And it has been observed that the degree of the change of CD spectrum in the first absorption band region $(^1A_{2g})$ depends on the donor number (DN) of the solvents. From $^1H$ NMR spectrum, it is interpreted that these variations in the CD spectrum of trans-[Co(R,R-chxn)$_2Cl_2]^+$ complex are due to the favorable interaction between solvent molecules and the equatorial N-H protons of R,R-chxn ligands.

• Applied Chemistry for Engineering
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• v.16 no.6
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• pp.755-759
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• 2005

This study was based on organic electroluminescence display. Especially, DPAVBi, AVBi and DPVBi for the emitting materials were synthesized by Wittig, Wittig-Horner reaction. This reaction was conducted between phosphorous ylide and 4-(diphenylamino)benzaldehyde, 9-anthraldehyde and benzophenone. The structural property of reaction products were analyzed by FT-IR, $^1H-NMR$ spectroscopy and thermal stability, reactivity and PL property were analyzed by melting point, yield and emission spectrum, respectvely. The photoluminescence spectra of a pure DPAVBi, AVBi and DPVBi were observed at approximately 445nm, 484nm and 450nm, respectively. In this study, it was known that DPAVBi, AVBi, DPVBi had a different reaction properties according to stability of ${\alpha}$-position carbonyl group of the aldehyde, ketone.

• Journal of the Korean Applied Science and Technology
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• v.12 no.1
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• pp.35-41
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• 1995

The Hydrolysis kinetics of Benzoyl Styrene Derivatives[I]${\sim}$[IV] was investigated by ultraviolet spectrophotometery in 5% dioxane-$H_2O$ at $40^{\circ}C$. The structure of these compounds were ascertained by means of ultraviolet, melting point, IR and NMR spectra. The rate equations which were applied over a wide pH range (pH $1.0{\sim}13.0$) were obtained. The substituent effects on Benzoyl styrene derivatives[I]${\sim}$[IV] were studied, and the hydrolysis were facilitated by electron attracting groups. On the basis of the rate equation and substitutent effect and final product, the plausible hydrolysis reaction mechanism was proposed: At pH 1.0${\sim}$pH 9.0, not relevant to the hydrogenl ion concentration, neutral $H_2O$ molecule competitively attacked on the double bond. By contrary. Above pH 9.0, It was proportional to concentration of hydroxidel ion.

• Korean Journal of Pharmacognosy
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• v.1 no.4
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• pp.119-124
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• 1970

Evodia daniellii $H_{EMSLEY}$, a plant belonging to Rutaceae, is cultivated in Korea and used as a folkmedicine for gastric inflammation, extermination of noxious insects, and headache. The seed oil of this plant also has been used in various diseases, for example, dermatitis, scabies and so forth. From the barks, fruit peels, and seed oil of Evodia daniellii $H_{EMSLEY}$, four crystalline compounds were isolated. Three compounds except one were characterized as methyl sinapate, bergapten, and evodiamine by m.p. determination, elemental analysis, UV, IR, NMR spectra and mass analysis. Even though methyl sinapate was a known synthetic compound, it was not yet reported as a natural product. From the seed oil, unsaponifiable fraction was separated and was analyzed. It was considered to be consisted with sterols, hydrocarbons and tocopherols.

• Microbiology and Biotechnology Letters
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• v.28 no.4
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• pp.233-238
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• 2000

To develop biodegradable and safe flocculant, Achromobacter sp. HY-66 were isolated from soil. The purified flocculant was composed of fructose and glucose in an approximate molar ratio of 1:24. Molecular weight was approximately 9$\times$105 dalton by Sepharose CL-4B gel filtration chromatography. Elemental analysis revealed that the contents of carbon, hydrogen and oxygen were 37.72%, 5.37% and 56.89%, respectively. The presence of O-H stretching, C-H streching, carboxy ester and C-H bending were confirmed by IR absorption spectrum analysis. We suggest that a bioflocculant produced from Achromobacter sp. YJ-66 is new and different from other bioflocculants.

• Textile Coloration and Finishing
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• v.14 no.4
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• pp.240-248
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• 2002

The most effective solvent for extract of dye from amur cork tree was methanol. Two protoberberine alkaloids, berberine and palmatine, were isolated from amur cork tree by Prep-TLC, and the developing solvent was Benzene : AcOEt ; PrOH ; MeOH ; EtNH$_2$(8: 4: 2: 0.5: 0.5). Dyes were stable at a high temperature and there wasn't any change of color at pH 3~9 and with added metal mordants. In adsorption spectra of aqueous solution of berberine and tannin mixture, two isosbestic points$(328^{nm},\;357^{nm})$ were found and the mole fraction of reaction of components was 1:1.

• Bulletin of the Korean Chemical Society
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• v.28 no.12
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• pp.2382-2388
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• 2007

A series of dimethine cyanine dyes were synthesized in a fast, efficient and high yield by the condensation of quaternary salts with 1H-indole-3-carbaldehyde in the presence of piperidine under solvent-free microwave irradiation. The products were identified by 1H NMR, IR, UV-Vis spectra and elemental analysis. The absorption and fluorescence properties of these dyes were investigated both experimentally and theoretically. Calculations performed at a combination of time-dependent density functional theory (TD-DFT) and the polarizable continuum model (PCM) reproduced the π-π* type absorption bands of the dyes. Regression analysis was used for studying theoretical results of the absorption maxima in different solvents. Compared with experimental counterparts, estimated overall uncertainties in the absorption maxima were about ±2%.

• Bulletin of the Korean Chemical Society
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• v.30 no.10
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• pp.2351-2354
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• 2009

A series of N-arylsuccinanilic acids, N-arylsuccinimides, N-arylmaleanilic acids, and N-arylmaleimides was prepared and their NMR spectra were examined by correlating the $^1H\;and\;^{13}C$ chemical shift values with the corresponding Hammett $\sigma$ values. The carbonyl carbons of the amides show a normal correlation with $\sigma$ but those of the imides show an inverse correlation.