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George, S.M.,Yon, G.H.,Park, B.K.,Lee, K.M.,Do, Y.,Kim, C.G.,Chung, T.M. Elsevier Sequoia [etc.] 2012 Inorganica chimica acta Vol.383 No.-
A series of tridentate β-diketiminate ligands, (2Z,4E)-4-{[2-(dimethylamino)ethyl]imino}-N-(propan-2-yl)pent-2-en-2-amine (L<SUP>1</SUP>H), (2Z,4E)-4-{[3-(dimethylamino)propyl]imino}-N-(tert-butyl)pent-2-en-2-amine (L<SUP>2</SUP>H), and (2Z,4E)-4-{[3-(dimethyl-amino)propyl]imino}-N-(propan-2-yl)pent-2-en-2-amine (L<SUP>3</SUP>H), and their strontium complexes, SrL<SUB>2</SUB><SUP>1</SUP> (1), SrL<SUB>2</SUB><SUP>2</SUP> (2), and SrL<SUB>2</SUB><SUP>3</SUP> (3) were synthesized as potential strontium precursors, by the reaction of Sr[N(SiMe<SUB>3</SUB>)<SUB>2</SUB>]<SUB>2</SUB> and two equivalents of L<SUP>1</SUP>H, L<SUP>2</SUP>H, and L<SUP>3</SUP>H, respectively. Compounds 1-3 were characterized by spectroscopic (IR, MS, <SUP>1</SUP>H and <SUP>13</SUP>C NMR), microanalytical methods, and single crystal X-ray diffractometry. The X-ray crystal structure reveals that complex 1 has a monoclinic space group, C2/c. The structure shows the bonding of two β-diketiminate ligands to the strontium metal through six nitrogen atoms. Additionally, the isopropyl groups on the ligands force 1 to attain a highly distorted octahedron. Thermogravimetric analyses of the compounds 1-3 exhibit a primary mass loss on 130-300<SUP>o</SUP>C region.
Moving Forward in Space Plasma Physics
Parks, George K. 한국우주과학회 2009 한국우주과학회보 Vol.18 No.2
Space physics is more than fifty years old and is going through middle age. Looking back and thinking about what has been learned during the past fifty years, one finds that progress was made at the expense of exactness. Past observations have been interp
STRUCTURE OF A MAGNETIC DECREASE OBSERVED IN A COROTATING INTERACTION REGION
이은상,George K. Parks 한국천문학회 2016 Journal of The Korean Astronomical Society Vol.49 No.1
Magnetic decreases are often observed in various regions of interplanetary space. Many studies are devoted to reveal the physical nature and generation mechanism of the magnetic decreases, but still we do not fully understand magnetic decreases. In this study, we investigate the structure of a magnetic decrease observed in a corotating interaction region using multi-spacecraft measurements. We use three spacecraft, ACE, Cluster, and Wind, which were widely separated in the x- and y-directions in the geocentric solar ecliptic (GSE) coordinates. The boundaries of the magnetic decrease are the same at the three locations and can be identified as tangential discontinuities. A notable feature is that the magnetic decrease has very large dimension, $\gtrsim$268 R$_\mathrm{E}$, along the boundary, which is much larger than the size, $\sim$6 R$_\mathrm{E}$, along the normal direction. This suggests that the magnetic decrease has a shape of a long, thin rod or a wide slab.
KINETIC PROPERTIES OF MAGNETIC DECREASES OBSERVED IN THE SOLAR WIND AT ~ 1 AU
이은상,George K. Parks 한국천문학회 2016 Journal of The Korean Astronomical Society Vol.49 No.2
In this study, we investigate the kinetic properties of magnetic decreases observed in the solar wind at $\sim$1 AU using the Cluster observations. We study two different magnetic decreases: one with a short observation duration of $\sim$2.5 minutes and stable structure and the other with a longer observation duration of $\sim$40 minutes and some fluctuations and substructures. Despite the contrast in durations and magnetic structures, the velocity space distributions of ions are similar in both events. The velocity space distribution becomes more anisotropic along the direction parallel to the magnetic field, which differs from observations obtained at high heliographic latitudes. On the other hand, electrons show different features from the ions. The core component of the electrons shows similar anisotropy to the ions, though the anisotropy is much weaker. However, while ions are heated in the magnetic decreases, the core electrons are slightly cooled, especially in the perpendicular direction. The halo component does not change much in the magnetic decreases from the ambient solar wind. The strahl component is observed only in one of the magnetic decreases. The results imply that the ions and electrons in the magnetic decreases can behave differently, which should be considered for the formation mechanism of the magnetic decreases.
Jung, E.A.,George, S.M.,Han, J.H.,Park, B.K.,Son, S.U.,Kim, C.G.,Chung, T.M. Elsevier Sequoia 2017 Journal of organometallic chemistry Vol.833 No.-
Novel indium complexes [(CH<SUB>3</SUB>)<SUB>2</SUB>In(OR)]<SUB>2</SUB> (1-7) were synthesized using a series of donor-functionalized alkoxide ligands as potential precursors for thin-film applications. These complexes showed dimeric configurations with two μ<SUB>2</SUB>-O bridging between the metal centers. Moreover, the indium metal centers in these complexes exhibited pentacoordinated states with distorted trigonal-bipyramidal geometry. The complexes were characterized by Fourier transform (FT)-infrared, and FT-nuclear magnetic resonance spectroscopies, elemental analyses, and thermogravimetric analyses (TGA). The TGA curves of complexes 4 and 7 exhibited a single-step mass loss at 100-275 <SUP>o</SUP>C, indicating good volatility and thermal stability.
Synthesis of novel tin complexes using functionalized oxime ligands
Jung, E.A.,George, S.M.,Han, S.H.,Park, B.K.,Han, J.H.,Son, S.U.,Kim, C.G.,Chung, T.M. Elsevier Sequoia [etc.] 2016 Inorganica chimica acta Vol.446 No.-
<P>Novel tin complexes stabilized by alkoxy-functionalized oxime ligands [Sn(L-1)(2)](2) (1) and [Sn(L-2)(2)](2) (2), were prepared and characterized. Single-crystal X-ray diffraction analysis revealed that the complexes were obtained as dimers in which the tin metal centers are bridged by a pair of mu(2)-oxygen atoms. Due to the ligand steric effects, the metal centers in these complexes adopted an unusual distorted square pyramidal geometry and displayed interesting structural features. The thermo-gravimetric analyses of the complexes showed major mass loss in the 175-380 degrees C region. (C) 2016 Elsevier B.V. All rights reserved.</P>