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Synthesis and Photoluminescent Properties of LaPO4:RE3+ (RE = Tb, Ce)Phosphors
조신호,우종관,최기항 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.5
LaPO4:RE3+(RE = Tb or Ce) phosphor powders were synthesized with different activator ion concentrations by using the solid-state reaction method. The effect of the activator ion concentration on the structural, morphological, and luminescent properties of lanthanide-phosphate phosphors was investigated. XRD patterns revealed that the synthesized phosphors with different activator ions showed a monoclinic structure with a main (120) diffraction peak for both activator ions. The crystallite size was estimated by using the Scherrer formula, and the maximum size was obtained at 0.01 mol of Ce3+ions and at 0 mol of Tb3+ions. The emission spectra of Tb3+-doped LaPO4phosphors under excitation at 210 nm exhibited one intense green band at 548 nm and three weak lines peaking at 493, 590, and 640 nm, respectively. The intensities of all the emission bands reached their maxima at 0.10 mol of Tb3+ ions. As for the Ce3+-doped LaPO4 phosphors, two strong emission bands were observed, one each at 324 and 340 nm, and the energy difference between the two peaks was 0.18 eV. These results suggest that multicolor emission can be realized by controlling the concentrations of the activator ions incorporated into the host lattice.
Density Functional Study on Metal Decoration onto a Metal-Organic Framework
Dong Hyun Jung,김자헌,최기항,Daejin Kim,Seung-Hoon Choi 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.4
We carried out density functional theory calculations on the adsorption of a Ti atom at the Zn-O3, Zn-O2 and Hex sites in one of isoreticular metal-organic frameworks (IRMOFs). The binding energy is largest at the Hex site and smallest at the Zn-O3 site. Through the analyses of the orbitals and then density of states plots, we also found that the binding at the Hex site was due to direct orbital overlap between the Ti atom and the carbon atoms of the phenyl ring. When a Ti atom binds to the Zn-O3 site, the interactions of the d orbitals of the Ti atom with the adjacent oxygen atoms have anti-bonding characters. At the Zn-O2 site, however, the d orbitals of the Ti atom have bonding interactions with the oxygen atoms of the carboxylate groups. Thus, the binding energy is larger at the Zn-O2 site than at the Zn-O3 site.
Theoretical Studies on Pillared Covalent Organic Frameworks for a Hydrogen Storage Material
Daejin Kim,김자헌,최기항,Dong Hyun Jung,Seung-Hoon Choi 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.4
Pillared covalent organic frameworks (PCOFs) have been studied with density functional theory (DFT) calculations. Based on the covalent organic framework-1 (COF-1) structure, one of the COFs synthesized by using the condensation reactions of phenyl diboronic acid C6H₄[B(OH)₂]₂, we inserted pillar molecules between the organic layers to improve the physisorption ability for hydrogen molecules. Pyridine, pyrazine and 1,4-diaza-bicyclo[2.2.2]octane (DABCO) could be considered as the candidates for the pillar molecules and pyridine wad used as the pillar in this study. The binding sites and the orientations of the pillar molecules were investigated on cluster models of COFs. From the calculations, we observed puckering in the cluster model of the COF, which were caused by binding of pyridine molecules.
Ji Young Kim,Myung-Hee Son,최기항,백두종,Min Kyung Ko,Eun Jeong Lim,배애님,금교창,Jae Kyun Lee,조용서,추현아,Youn-Woo Lee,문병석,이병철,이호영,민선준 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.8
The synthesis and in vivo evaluation of 5-methoxy-2-(phenylethynyl)quinoline (MPEQ) 3 as a potential mGluR5 selective radioligand is described. We have identified MPEQ 3 exhibiting the analgesic effect in the neuropathic pain animal model. The effect of mGluR5 on neuronal activity in rat brain was evaluated through FDG/PET imaging in the presence of MPEQ 3. In addition, the PET study of [11C]MPEQ 3 proved that accumulation of [11C]MPEQ 3 in rat brain was correlated to the localization of the mGluR5.
A Highly Selective Staurosporine Derivative Designed by a New Selectivity Filter
Ibrahim M. El-Deeb,한동근,김인태,Sang Woo Lee,양영목,최기항,Young Jun Yoo,Byung Sun Park,Su Jin Jung,이소하 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.5
KIST301135 was semi-synthetically prepared by the reaction of Staurosporine with triphosgene in anhydrous dichloromethane. The structure of KIST301135 was confirmed by ^1H NMR, ^13C NMR, and high resolution mass spectrum. KIST301135 was initially tested in a single dose duplicate mode at a concentration of 20 nM over a panel of 53 kinases against Staurosporine as a positive control. KIST301135 has showed inhibitions above 75% in only 2 kinases (FLT3 and JAK3 kinases) of the 53 tested kinases, while Staurosporine has showed inhibitions above 80% in about 62% of the tested kinases. KIST301135 was retested at a 5-dose testing mode over the 9 kinases inhibited by percentages over 20 at the single dose testing in order to determine its IC50values. KIST301135 has shown much improved kinase inhibitory selectivity relative to Staurosporine in its potency at JAK3 kinase and CAMK2b kinase.
Won-Kyoung Choi,Mohammed I. El-Gamal,최홍석,Jun Hee Hong,DaejinBaek,최기항,오창현 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.9
A series of new diarylureas and diarylamides possessing 1,3,4-triarylpyrazole scaffold was synthesized and their in vitro antiproliferative activities against A375P human melanoma cell line and NCI-60 cell line panel were tested. Compounds 9, 11, 12, 14, and 17-21 showed superior potency against A375P to Sorafenib. Over the NCI-60 cancer cell line panel, compound 14 possessing a methoxy group, amide linker, and 4-chloro-3- (trifluoromethyl)phenyl terminal ring showed the highest potency and broad-spectrum anticancer activity. Compound 13 showed high selectivity towards leukemia subpanel over other cancer types.