• Bulletin of the Korean Chemical Society
• /
• v.23 no.1
• /
• pp.35-40
• /
• 2002

Photoreaction of guest organic anions in layered organic-inorganic hybrid materials was investigated. The layered hybrids were synthesized by an anion-exchange reaction of $[LiAl_2(OH)_6]Cl{\cdot}yH_2O$ layered double hydroxide with aqueous (Z,Z)- and (E,E)-muconates under inert atmospheric condition, to give new organicinorganic hybrids of $[LiAl_2(OH)_6]_2[(Z,Z)-C_6H_4O_4]{\cdot}zH_2O$ and $[LiAl_2(OH)_6]_2[(E,E)-C_6H_4O_4]{\cdot}H_2O$, respectively. The basal spacings calculated by XRPD of intercalates indicate that muconate anions have almost vertical arrangements against the host $[LiAl_2(OH)_6]^+$ lattices in the interlayer of organic-inorganic hybrid materials. When UV light was irradiated on the suspension of $[LiAl_2(OH)_6]_2[(Z,Z)-C_6H_4O_4]{\cdot}zH_2O$, the (Z,Z)-muconate anions of the gallery space of hybrids were polymerized in the aqueous media while it was isomerized into more stable (E,E)-muconate in the methanollic suspension in the presence of catalytic amount of molecular iodine. All the products were characterized using elemental analysis, TGA, XRPD, FT-IR, $^1H$ NMR and $^{13}C$ CP-MAS NMR.

• Applied Biological Chemistry
• /
• v.1
• /
• pp.48-54
• /
• 1960

Studing the binding of the 5-Iodopyrimdines by human serum albumin we obtained the following conclusions; 1. The more strong electron donating groups in the molecule of 5-Iodopyrimidines, the larger the binding force with human serum albumin. This trend seems to be attributed by increase of polarization of the electron donating groups in 5-Iodopyrimidines molecule. 2. The binding force of 5-Iodopyrimidines by human serum albumin is increased with the pH increasing could be occurred the configurational changes of human albumin molecule, and this new binding sites of human serum albumin molecule would form the intermolecular complex with 5-Iodopyrimidines molecule more strongly.

• Bulletin of the Korean Chemical Society
• /
• v.34 no.3
• /
• pp.831-836
• /
• 2013

Platinized counter electrode is common in most of the dye sensitized solar cell (DSSC) researches because of its high catalytic activity and corrosion stability against iodine in the electrolyte. Platinum (Pt) film coating on fluorine doped tin oxide (FTO) glass surface by using alcoholic solution of hexachloroplatinic acid ($H_2PtCl_6$), paste containing Pt precursors or sputtering are widely used techniques. This paper presents a novel application of Pt ink containing nanoparticles for making platinized counter electrode for DSSC. The characteristics of Pt films coated on FTO glass surface by different chemical methods were compared along with the performance parameters of the DSSCs made by using the films as counter electrodes. The samples coated with Pt inks were sintered at $300^{\circ}C$ for 30 minutes whereas Pt-film and Pt-paste were sintered at $400^{\circ}C$ for 30 minutes. The Pt ink diluted in n-hexane was found to a promising candidate for the preparation of platinized counter electrode. The ink may also be applicable for DSSC on flexible substrates after optimization its sintering temperature.

• Journal of the Korean Chemical Society
• /
• v.10 no.1
• /
• pp.46-49
• /
• 1966

The systems of bromobenzene with chlorine and iodine monobromide in carbon tetrachloride have been investigated at $25^{\circ}$ by means of ultraviolet spectrophotometric measurements. The results indicate the formation of one to one molecular complexes, $C_6H_5Br{\cdot}Cl_2$ and $C_6H_5Br{\cdot}IBr$, in solution. The equilibrium constants obtained at $25^{\circ}$ for the formation of these two complexes are 0.0485 and $0.183l{\cdot}mole^{-1}$, respectively. Comparison of these results with those reported in the literature on other complexes of similar type shows that the relative stabilities of the complexes decrease in the following orders: $ICl>IBr>I_2>Br_2>Cl_2$Benzene > bromobenzene > chlorobenzene.

• Journal of the Korean Chemical Society
• /
• v.52 no.1
• /
• pp.36-46
• /
• 2008

cyclization of primary arylselenocarboxylic amides with a-bromoketones afforded a variety of new 2,4-diaryl-1,3-selenazoles. Halogenation of the 2,4-diaryl-1,3-selenazoles with chlorine, bromine and iodine gave the new 1,1-dihalo-2,4-diaryl-1,3-selenazoles in good yields. Antiviral activity of some 1,1-dihalo-2,4-diaryl-1,3-selenazoles has been tested against AIDS virus (HIV-1 and HIV-2). They showed some bioactivity against HIV-1. All compounds were characterized by their elemental analysis, 1H NMR and mass spectroscopic data. The crystal structure of 2-(3,4-dimethoxyphenyl)-4-(4-bromophenyl)-1,3-selenazole displays the molecular configuration.

• Nuclear Engineering and Technology
• /
• v.3 no.3
• /
• pp.141-147
• /
• 1971

In iodine-131 labelling of iodocompounds such as tetrachloro-P-tetraiodo R-fluorescein, sodium orthoiodohippurate and a non-iodocompound, human serum albumin (HSA), the labelling rates and yields are accurately compared with each other. The reaction systems conducted for each compounds were different conditions: sodium iodide-$^{131}$ I containing reducing agent, sodium iodide-$^{131}$ I free from reducing agent, and sodium iodide-$^{131}$ I free from reducing agent but containing considerable amount of iodide-$^{131}$ I etc. The labelling yields were generally poor; 10% in the case of using sodium iodide-$^{131}$ I containing redoing agent, and 50~60% in the case of using sodium iodide-$^{131}$ I free from reducing agent but containing considerable amount of iodide-$^{131}$ I. However, fair yields were obtained in the case of using sodium iodide-$^{131}$ I free from reducing agent and mostly in the form of iodide-$^{131}$ I. The reaction entities involved in these reactions are also briefly discussed.

• Journal of the Korean Chemical Society
• /
• v.37 no.1
• /
• pp.36-42
• /
• 1993

In the presence of $Ca^{2+}$ ion, the charge transfer (CT) interaction of nonionic surfactants, $nonylphenol-(ethylene oxide)_n\;[NP-(EO)_n; n = 11, 40, 100]$ with iodine in aqueous solution were investigated by UV-visible spectrophotometer. The characteristics of spectra depended on the concentration of $Ca^{2+}$ ion and the number of EO unit. Above CMC, the intensity of the CT band by the addition of $Ca^{2+}$ ion for the $NP-(EO)_{11}$ and $NP-(EO)_{40}$ increased and then decreased, while for the $NP-(EO)_{100}$ continuously increased. The increase in the intensity of CT band were attributed to the compactness of micelle in the presence of $Ca^{2+}$ ion. These phenomena may be explained by the fact that the linear ethylene oxide (EO) chain, to be free configuration in aqueous solution, could form a pseudo-crown ether structures capable of forming complexes with $Ca^{2+}$ ion.

• Journal of the Korean Chemical Society
• /
• v.14 no.3
• /
• pp.243-256
• /
• 1970

Halogen contents of the river water of Seoul city and of municipal reservoirs were investigated from June in 1969 to February in 1970. Bromine contents were ranging from 0.006 to 0.048 mg/1 of the reservoirs, 0.021 to 0.048 mg/1 of Han River, 0.051 to 0.540 mg/1 of rivers running through residential areas and 0.083 to 0.920 mg/1 of rivers running through industrial areas. Bromine contents increased as the river water became contaminated. Most of Br/Cl of Han River and the reservoirs were higher than $3.4{\times}10^{-3}$ of sea water. Bromine contents at 17 different places were the largest in November. The contents of chlorine, iodine and COD (chemical oxygen demand) were nearly correlated with that of bromine. Bromine contents of the river waters in Seoul chiefly originated from consumption of domestic and industrial salt.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2000.11a
• /
• pp.145-148
• /
• 2000

In contrast to the $\pi$ -conjugated polymers which typically absorb light only in the visible spectral region, the $\sigma$-conjugated polymers can be used as efficient material absorbing light in the UV region. In this work, the electronic and optical properties of I$_2$-doped $\sigma$ -conjugated poly (methyl-phenylsilylene) (PMPSi) polymer were investigated. DC conductivity up to 1.2$\times$10$^{-4}$ S/cm was obtained by I$_2$-doping. In UV/Vis absorbance spectrum, a new peak was observed near 370 nm, which was explained by polaron model. The photoluminescence (PL) intensity decreased with increasing degree of I$_2$-doping, and the Infrared (IR) spectrum analysis revealed that the dopants are not directly coupled to the polymer, but effect motions of the methyl and phenyl groups.

• Journal of Radiopharmaceuticals and Molecular Probes
• /
• v.4 no.2
• /
• pp.99-105
• /
• 2018

$^{211}At$ is an alpha emitting radionuclide, which can be produced using cyclotron with alpha beam. In addition, its strong linear energy transfer and iodine-like chemistry make that $^{211}At$ is one of the most attractive radionuclide in the field of targeted alpha therapy. In this review, production, labeling, and radiopharmaceuticals of $^{211}At$ will be discussed.