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Kim, Hyo-Suk,Jung, Eun Ae,Han, Seong Ho,Han, Jeong Hwan,Park, Bo Keun,Kim, Chang Gyoun,Chung, Taek-Mo American Chemical Society 2017 Inorganic Chemistry Vol.56 No.7
<P>New germanium chalcogenide precursors, S=Ge(dmamp)(2) (3), S=Ge(dmampS)(2) (4), Se=Ge(dmamp)(2) (5), Se=Ge(dmampS)(2) (6), Te=Ge(dmamp)(2) (7), and Te=Ge(dmampS)(2) (8), were synthesized from Ge(dmamp)(2) (1) and Ge(dmampS)(2) (2) using sulfur, selenium, and tellurium powders (dmamp = 1-dimethylamino-2-methyl-2-propanolate, dmampS = 1-dirnethylamino-2-methylpropane-2-thiolate). Complexes 1 and 2 were synthesized from metathesis reactions of GeCl2. dioxane with 2 equiv of aminoalkoxide or aminothiolate ligands. Thermogravimetric analysis of complex 1 displayed good thermal stability and volatility. The molecular structures of complexes 2-8 from X-ray single crystallography showed distorted trigonal bipyramidal geometry at the germanium centers. Germanium chalcogenide materials (GeSe and GeTe) were obtained from the thermal decomposition of complexes 5, 6, and 8 in hexadecane. X-ray diffraction patterns exhibited that GeSe and GeTe had orthorhombic and rhombohedral phases, respectively. This study affords a facile method to easily prepare germanium chalcogenide materials using well-designed and stable complexes by thermal decomposition of single-source precursors in solution.</P>
New heteroleptic magnesium complexes for MgO thin film application
Kim, Hyo-Suk,George, Sheby Mary,Park, Bo Keun,Son, Seung Uk,Kim, Chang Gyoun,Chung, Taek-Mo The Royal Society of Chemistry 2015 Dalton Transactions Vol.44 No.5
<P>Novel heteroleptic magnesium complexes, [Mg(dmamp)(acac)]<SUB>2</SUB> (<B>1</B>), [Mg(dmamp)(tmhd)]<SUB>2</SUB> (<B>2</B>), [Mg(dmamp)(tfac)]<SUB>2</SUB> (<B>3</B>), and [Mg(dmamp)(hfac)]<SUB>2</SUB> (<B>4</B>), were successfully synthesized using dmamp and β-diketonate as ligands. The thermogravimetric analyses and volatile studies of the complexes showed that the complexes <B>2</B> and <B>4</B> display high volatility and thermal stability. The single crystal X-ray study of the complexes reveals that both the complexes <B>1</B> and <B>2</B> were crystalized in the triclinic space group and as dimers, where magnesium atoms are in the pentacoordinate state with distorted trigonal bipyramidal geometry.</P> <P>Graphic Abstract</P><P>Novel magnesium precursors for the ALD/CVD process of MgO thin films were synthesized as heteroleptic complexes. These complexes show high volatility and good thermal properties which proved to be superior to homoleptic parent complexes. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4dt03497j'> </P>
Trinuclear magnesium complexes stabilized by aminoalkoxide ligands
Kim, Hyo-Suk,George, Sheby Mary,Jung, Eun Ae,Han, Jeong Hwan,Park, Bo Keun,Son, Seung Uk,Kim, Chang Gyoun,Chung, Taek-Mo Informa UK (TaylorFrancis) 2016 Journal of coordination chemistry Vol.69 No.17
<P>New magnesium complexes, [Et2Mg3(dmamp)(4)] (1) and [(CH2=CH)(2)Mg-3(dmamp)(4)] (2), were prepared by the reaction of alkylmagnesium bromide with sodium 1-dimethylamino-2-methyl-2-propoxide [Na(dmamp)] in THF. Complexes 1 and 2 were characterized by H-1 and C-13 NMR spectroscopies, FTIR spectroscopy, elemental analysis, and single-crystal X-ray diffraction (XRD) analysis. The XRD analysis showed that these complexes are trinuclear where the alkoxy O is the (2)-O bridge between the Mg ions. Among the three metal centers, the two terminal Mg ions are five coordinate and have a square-pyramidal geometry, whereas the central Mg is four coordinate with a distorted tetrahedral geometry. The combination of ethyl and vinyl groups with sterically bulky aminoalkoxide ligands plays an important role in stabilizing the molecule.</P>
김문연,고은하,하경임,김지용,전창호 동국대학교 경주대학 1996 東國論集 Vol.15 No.-
검사방법의 평가로서 자동화기기에 대한 적절한 평가는 특히 수입에 전적으로 의존하는 국내여건을 생각할때 중요한 과제이다. ISP-1000은 대용량, 다항목의 선택적 생화학 자동 분석기로 국내에서는 거의 채택된 경험이 없는 기기로서 효율적인 선정을 하기위하여 4가지 화학검사에 대한 평가를 하였다. 시판되는 대조물질 Level Ⅰ,Ⅱ로 검사내 정밀도, 검사일간 정밀도, 직선성을 구하였으며 100명의 환자검체로는 Cobas Mira와의 상관성을 구하였다. 검사내 정밀도는 Level Ⅰ대조물질에서는 변이계수가 4.31-8.73%, Level Ⅱ 대조물질에서의 변이계수는 1.32-8.22%이었으며, 검사일간 정밀도는 Level Ⅰ 대조물질로 얻은 변이계수는 6.29-8.974%, Level Ⅱ 대조물질로 검사한 경우는 5.78-8.22%이었다. 직선성의 평가에서는 0.9917-0.9998의 우수한 직선성을 보여주었고(P<0.01), Cobas Mira에 대한 상관관계는 0.8427-0.9857의 범위에 있었다(P<0.01). 결론적으로 ISP-1000에 대한 4가지 화학검사의 평가에 있어서 검사중 정밀도, 검사일간 정밀도, 직선성은 우수하였으며, 상관관계는 만족할만하였으나 더 좋은 결과를 얻기위하여 parameter등에 대한 재검토가 필요한 것으로 생각되었다. It is an important task to evaluate autochemical analyzers as one of the labortory method evaluations, especially considering of the domestic environments almost depending on the import. By analyzing 4 chemical tests, we evaluated the high throughoutput, multichannel, selective and rarely adopted chemical autoanalyzer ISP-1000. We analyzed within run precision, between day precision, lineality with the commercial control materials, and correlation with 100 patients samples. In within run precision, CVs were ranged from 4.31~8.73% in Level I control material, l.32-8.22% in Level Ⅱ control material. In between day precision, CVs were ranged from 6.29-8.974% in Level I control material, 5.78-8.22% in Level Ⅱ control material. The lineality was excellent(r²>O,9917, p<O.Ol). The correlation coefficients between ISP-l000 and Cobas Mira were ranged from 0.8247∼0.9857%(P<O.0l). In conclusion, 4 chemical tests of ISP-l000 were acceptable in within run precision, between day precision and lineality, and correlation with Cobas Mira was good but adjusting the parameters would be necessary for the better results.
p-Type GaN Growth from a Single GaN Precursor via Molecular Beam Epitaxy and Dopant Activation
Cunxu Gao,Chang Gyoun Kim,Chang Soo Kim,김도진,우부성,김효진,Young Eon Ihm 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.I
A study of GaN and p-GaN growths with doping of Mg, Be and Mn was undertaken using a single GaN precursor source via molecular beam epitaxy. Measurements of the changes in surface morphology and film resistivity with growth temperature and doping were carried out. Mg or Be acceptors were shown to improve the surface roughness of the films through forming of acceptor-nitrogen-hydrogen complexes. Thermal annealing for acceptor activation was performed in vacuum, Ar, and N$_2$ by using rapid thermal annealing. The environment of the activation annealing process was shown to affect the activation kinetics and the activation behaviors. A nitrogen ambient delayed the activation of the acceptors, but higher temperature promoted the activation process. The behaviors of the acceptor-nitrogen-hydrogen complexes were systematically examined through experimental set-ups and comparison with the behaviors in GaN:Mn film.