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Hwang, Yeon Korean Crystallographic Association 2006 韓國結晶學會誌 Vol.17 No.2
BaO layers were formed on the Si(100) surface by thermal evaporation of barium metal with simultaneous oxidation. The atomic structure of BaO layers at the initial stage of the deposition was investigated by the scattering intensity variation of $He^+$ions on time-of-flight (TOF) impact-collision ion scattering (ICISS). The results show that several number of BaO layers are formed on the Si(100) surface with the lattice parameter of bulk phase, and the occupation of oxygen atoms of the BaO layers is on-top site of silicon atoms.
An Easier Way to Calculate the Crystallographic Interplanar Angles
Han, Won-Sik,Kang, Sang-Ook,Suh, Il-Hwan Korean Crystallographic Association 2007 韓國結晶學會誌 Vol.18 No.1
The equations for the calculation of the crystallographic interplanar angles for the seven crystal systems are described using only the real crystal unit cell parameters.
Kim, Cheal,Kim, Sung-Jin,Kim, Young-Mee Korean Crystallographic Association 2005 韓國結晶學會誌 Vol.16 No.2
Five Cu(II) compounds were obtained from different copper salts with btp ligands, and their structures were determined by X-ray crystallography. The structure of coordination polymer 2 contains btp-bridged tetranuclear Cu(II) units weakly connected by nitrate ions, and the structure of a discrete Cu(II) molecule 1 contains acetates and btp ligands. With perchlorate anions, two btp ligands bridge Cu(II) ions to form a double zigzag chain 3, while a single zigzag chain 4 is created with sulfate anions. The reaction of $Cu(NO_{3})_{2}$ containing $NH_{4}PF_{6}$ with btp ligands also produced a polymeric compound 5 containing $Cu(H_{2}O)_{2}^{2+}$ and $Cu(NO_{3})_{2}$ units alternatively bridged by btp ligands with H-bonds between copper bonded water and nitrate oxygen atoms. Five Zn(II) compounds were obtained from different zinc salts with btp ligands, and the structures of polymeric compounds (6, 7 and 8) and monomeric compounds (9 and 10) were determined by X-ray crystallography. With nitrate, chloride and bromide anions, btp ligands bridge Zn(II) ions to form polymeric compounds (6, 7 and 8), but btp ligands coordinate to a Zn(II) ion to form monomeric complexes (9 and 10) with $PF_{6}^{-}$ and perchlorate anions. Four silver salts and btp ligands produced two kinds of structures, dinuclear 20-membered rings and one-dimensional zigzag chain depending on different anions. For $ClO_{4}^{-}$ and OTf anions, weak interactions between Ag(I) and anions make dinuclear 20-membered rings construct polymeric compounds (11 and 13). For $PF_{6}^{-}$ anion, there are also weak interactions between Ag(I) and $F(PF_{6}^{-})(12)$, but they do not construct a polymeric compound. For $O_{2}CCF_{3}^{-}$ anion, btp ligands bridge Ag(I) atoms to make one-dimensional zigzag chain (14), and there are also interactions between Ag(I) and anions.
Hexaphenylbenzene $C_6(C_6H_5)_6$
Kim Young-Sang,Ko Jaejung,Kang Sang Ook,Han Won-Sik,Jeong Jae-Ho,Suh Il-Hwan Korean Crystallographic Association 2005 韓國結晶學會誌 Vol.16 No.1
The structure of the title compound has been determined by single-crystal X-ray diffraction work. The crystals are orthorhombic, space group $Pna2_1$ with a=11.095(3), b=21.834(7), c=12.574(4) $\AA$, and R1=0.0667. The average carbon bond length in aromaticity In the molecule is 1.386(1) $\AA$ and the average single bond length linking the central benEene ring and peripheral phenyl rings is 1.491(3) $\AA$. The average dihedral angle between the central benzene ring and each of six peripheral phenyl rings is $67.1(1)^{\circ}$ and the average dihedral angle between neighboring two phenyl rings is $55.0(1)^{\circ}$. Thus the molecule adopts a quasi-propeller configuration with approximate six-fold rotation symmetry.
Toluene-4-sulfonic Acid 4-Allyl-2,6-dimethoxy-phenyl Ester
최규용,한병희,강성권,성창근,강상욱,서일환,Choi, Kyu-Yong,Han, Byung-Hee,Kang, Sung-Kwon,Sung, Chang-Keun,Kang, Sang-Ook,Suh, Il-Hwan Korean Crystallographic Association 2004 韓國結晶學會誌 Vol.15 No.1
上記 題目의 化合物, $C_{18}H_{20}O_5S$은 한 對非稱 單位內에 한 個의 分子를 가지고 對稱中心室間群 $P\={1}$로 結晶化 되었다. sulfonate 群內ml S 原子는 O와 C 原子들로 이루워진 四面體 環境을 維特하고 있으며, S-O 二重結合 平均 길이는 1.420(2) ${\AA}$이며 S-O 單一結合 길이는 1.598(2) ${\AA}$이고 S-C 結合 길이는 1.742(3) ${\AA}$이다. C(7)-S-O(3)-C(8) 의 비틀림 角은 100.3(2)$^{\circ}$이며, 두 個의 six-membered rings의 二面角은 42.73(20)$^{\circ}$이다. The title compound, $C_{18}H_{20}O_5S$, crystallized in the centrosymmetric space group $P\={1}$ with one molecule in an asymmetric unit. The S atom in the sulfonate group retains the overall tetrahedral environment of the O and C atoms with an average S-O bond of 1.420(2) ${\AA}$ for double bond and of 1.598(2) ${\AA}$ for single bond and S-C length of 1.742(3) ${\AA}$. The torsion angle C(7)-S-O(3)-C(8) is 100.3(2)$^{\circ}$ and the dihedral angle of the two planar six-membered rings is 42.73(20)$^{\circ}$.
Yun, Ho-Seop,Do, Jung-Hwan Korean Crystallographic Association 2004 韓國結晶學會誌 Vol.15 No.1
Two new nickel vanadium borophosphate cluster compounds, $(NH_4)_{10}[Ni(H_2O)_5]_4[V_2P_2BO_{12}]_6{\cdot}nH_2O$ (1) and $(NH_4)_{3.5}(C_3H_{12}N_2)_{3.5}[Ni(H_2O)_6]_{1.25}{[Ni(H_2O)_5]_2[V_2P_2BO_{12}]_6{\cdot}nH_2O$ (2) have been synthesized and structurally characterized. Inter-diffusion methods were employed to prepare the compounds. The cluster anion $[(NH_4)\;{\supset}\;V_2P_2BO_{12}]_6$ is used as a building unit in the synthesis of new compounds containing $Ni(H_2O){^{2+}_5}$ in the presence of pyrazine and 1,3-diaminopropane. Compounds contain isolated cluster anions with general composition ${[Ni(H_2O)_5]_n[(NH_4)\;{\supset}\;V_2P_2BO_{12}]_6}^{-(17-2n)}$ (n = 2, 4). Crystal data: $(NH_4)_{10}[Ni(H_2O)_5]_4[V_2P_2BO_{12}]_6{\cdot}nH_2O$, monoclinic, space group C2/m (no. 12), a = 27.538(2) ${\AA}$, b = 20.366(2) ${\AA}$, c = 11.9614(9) ${\AA}$, ${\beta}$ = 112.131(1)$^{\circ}$, Z = 8; $(NH_4)_{3.5}(C_3H_{12}N_2)_b[Ni(H_2O)_6]_{3.5}{[Ni(H_2O)_5]_2[V_2P_2BO_{12}]_6{\cdot}nH_2O$, triclinic, space group P-1 (no. 2), a = 17.7668(9) ${\AA}$, b = 17.881(1) ${\AA}$, c = 20.668(1) ${\AA}$, ${\alpha}$ = 86.729(1)$^{\circ}$, ${\beta}$ \ 65.77(1)$^{\circ}$, ${\gamma}$ = 80.388(1)$^{\circ}$, Z = 2.
Yoon, Hye-Jin,Mikami, Bunzo,Park, Hyun-Ju,Yoo, Ja-Kyung,Suh, Se-Won Korean Crystallographic Association 2007 韓國結晶學會誌 Vol.18 No.1
UDP-N-acetylglucosamine enolpyruvyl transferase (MurA; EC 2.5.1.7) catalyzes the first committed step of peptidoglycan biosynthesis in bacteria, i.e., transfer of enolpyruvate from phosphoenolpyruvate to UDP-N-acetyl-glucosamine. Because the crystallization condition contained a high concentration of ammonium sulfate, our inhibitor binding studies were not successful. Therefore, we employed a docking approach to investigate the inhibitor binding. Our results will be useful in structure-based design of specific inhibitors of MurA for antibacterial discovery.
Kim, Hyeon-Woo,Yoon, Hye-Jin,Kim, Hyung-Wook,Mikami, Bunzo,Suh, Se-Won Korean Crystallographic Association 2004 韓國結晶學會誌 Vol.15 No.1
The peptide deformylase from the pathogenic bacterium Staphylococcus aureus has been over-expressed in Escherichia coli and crystallized in the presence of the inhibitor actinonin at 297 K using polyethylene glycol 20000 as a precipitant. X-ray diffraction data have been collected to 2.2 ${\AA}$ resolution. The crystal is trigonal, belonging to the space group $P3_121$ (or its enantiomorph $P3_221$), with unit cell parameters of a = b = 62.70 ${\AA}$ c = 108.23 ${\AA}$, ${\alpha}\;=\;{\beta}\;=\;90^{\circ},\;and\;{\gamma}\;=\;120^{\circ}$. An asymmetric unit contains a monomer of the recombinant enzyme, giving a $V_M$ of 2.84 ${\AA}^3\;Da^_{-1}$ and a solvent content of 56.7%.
ALD of Nanometal Films and Applications for Nanoscale Devices
Kim, Hyung-Jun Korean Crystallographic Association 2005 韓國結晶學會誌 Vol.16 No.2
Among many material processing related issues for successful scaling down of devices for the next 10 years or so, the advanced gate stack and interconnect technology are two most critical research areas, which need technical innovation. The introduction of new metallic films and appropriate processing technologies are required more than ever. Especially, as the device downscaling continues well into sub 50 nm regime, the paradigm for metal nano film deposition technique research has been shifted to high conformality, low growth temperature, high quality with uniformity at large area wafers. Regarding these, ALD has sparked a lot of interests for a number of reasons. The process is intrinsically atomic in nature, resulting in the controlled deposition of films in sub-monolayer units with excellent conformality. In this paper, the overview on the current issues and the future trends in device processing technologies related to metal nano films as well as the R&D trends in these applications will be discussed. The focus will be on the applications for metal gate, capacitor electrode for DRAM, and diffusion barriers/seed layers for Cu interconnect technology.