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New organic 4‐(4‐methoxystyryl)‐1‐methylpyridinium crystals for nonlinear optical applications
Yun-Sang Lee,O-Pil Kwon,Woojin Yoon,Hoseop Yun,Mojca Jazbinsek4,In Cheol Yu,Fabian Rotermund,Dongwook Kim 대한화학회 2022 Bulletin of the Korean Chemical Society Vol.43 No.11
In this study, an organic nonlinear optical salt crystal, 4-(4-methoxystyryl)-1-methylpyridinium 4-bromobenzenesulfonate (MOS-BBS), is newly reported. MOS-BBS crystals exhibit perfectly parallel molecular ordering of 4-(4-methoxystyryl)-1-methylpyridinium (MOS) cationic chromophores with noncentrosymmetric P1space group symmetry, which provides an optimal configuration for maximizing themacroscopic second-order optical nonlinearity. The macroscopic optical nonlinearityof the MOS-BBS crystals is very large, with the diagonal effective first hyperpolarizabilityof 160 1030 esu. Furthermore, the MOS-BBS crystals exhibit a high thermalcrystal-phase stability. The lowest phase transition temperature of the MOS-BBS crystalsis 265C, which is ~90C higher than that of previously reported MOS-basedcrystals.
Hoseop Yun,Junghwan Do* 대한화학회 2005 Bulletin of the Korean Chemical Society Vol.26 No.1
Two new barium vanadium borophosphate compounds, (NH4)2(C2H10N2)6[Ba(H2O)5]2[V2P2BO12]6·8H2O, Ba- VBPO1 and (NH4)8(C3H12N2)4[Ba(H2O)7][V2P2BO12]6·17H2O, Ba-VBPO2 have been synthesized by interdiffusion methods in the presence of diprotonated ethylenediamine and 1,3-diaminopropane. Compound Ba-VBPO1 has an infinite chain anion {[Ba(H2O)5]2[V2P2BO12]6}14−, whereas Ba-VBPO2 has a discrete cluster anion {[Ba(H2O)7][V2P2BO12]6}16−. Crystal Data: (NH4)2(C2H10N2)6[Ba(H2O)5]2[V2P2BO12]6·8H2O, triclinic, space group P1 (no. 2), a = 13.7252(7) Å, b = 15.7548(8) Å, c = 15.8609(8) Å, α = 63.278(1)o, β =75.707(1)o, γ = 65.881(1)o, Z = 1; (NH4)8(C3H12N2)4[Ba(H2O)7][V2P2BO12]6·17H2O, monoclinic, space group C2/c (no. 15), a = 31.347(2) Å, b = 17.1221(9) Å, c = 22.3058(1) Å, β = 99.303(1)o, Z = 4.
Hoseop Yun,Yongkwan Dong,Jungwook Kim,Song-i Hahn,Junghwan Do 대한화학회 2005 Bulletin of the Korean Chemical Society Vol.26 No.8
Three new quaternary tantalum thiophosphates, K0.18TaPS6, K0.28TaPS6, and Rb0.09TaPS6 have been synthesized by using reactive alkali metal halide fluxes and structurally characterized by single crystal X-ray diffraction techniques. The crystal structures of K0.18TaPS6, K0.28TaPS6, and Rb0.09TaPS6 contain 3-dimensional open framework anions, [TaPS6]x (x = 0.09, 0.18, 0.28) with the empty channel which disordered alkali metal cations, K+ and Rb+ are located in. Crystal data: K0.18TaPS6, tetragonal, space group I41/acd (no. 142), a=15.874(3) Å, c=13.146(4) Å, V=3312.7(12) Å3, K, Z=16, R1=0.0545. Crystal data: K0.28TaPS6, tetragonal, space group I41/acd (no. 142), a=15.880(2) Å, c=13.134(3) Å, V=3312.1(10) Å3, Z=16, R1=0.0562. Crystal data: Rb0.09TaPS6, tetragonal, space group I41/acd (no. 142), a=15.893(3) Å, c=13.163(4) Å, V=3324.7(15) Å3, Z=16, R1=0.0432.
Sangwon Yun,Boohwi Hong,Hoseop Kim,Woosuk Chung,Youngkwon Ko,Yoon-Hee Kim 조선대학교 의학연구원 2021 Medical Bilogical Science and Engineering Vol.4 No.1
Cerebral venous sinus thrombosis (CVST), a rare cerebrovascular event, occurs in approximately 5 out of 1,000,000 people. Because subarachnoid hemorrhage (SAH) due to CVST during emergency cesarean section is rare, this condition is difficult to recognize and diagnose in patients under anesthesia. This report describes a parturient who experienced severe headache and motor weakness during an emergency cesarean section. The first manifestation of CVST was a severe headache, which overlapped with the presentation of SAH, making early diagnosis verydifficult. Anesthesiologists should be aware of the risk of CVST in pregnant women and closely monitor those who experience slight changes in intraoperative neurological symptoms.
이강민,윤우진,Yun Hoseop,Lee Soon W. 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.4
A novel pincer-type ligand L2 (40-(4-(6-methoxypyridin-3-yl)phenyl)-2,20:60,200-terpyridine), a terpyridine derivative, was prepared by Suzuki–Miyaura C C coupling. Under heating conditions in ethanol, ligands L1 (40-(4-bromophenyl)-2,20:60,200-terpyridine) and L2 reacted with Cd(NO3)24H2O to produce [Cd(L1) (NO3)2(H2O)] (1) and [Cd(L2)(NO3)2(H2O)](H2O) (2), respectively. In complexes 1 and 2, the sevencoordinate cadmium metal is coordinated to one terpyridine ligand, two nitrato ligands, and an aqua ligand. Under heating conditions in acetonitrile at 120 C, complex 1 was converted into a 1:1 mixture (3) of [Cd2L2(NO3-κ3O,O0,O00)(NO3-κ2O,O0)3] (3a) and [CdL(NO3-κ2O,O0)2] (3b). When complex 1 was treated with 4,40-bipyridine (bpy) under hydrothermal conditions, a one-dimensional linear coordination polymer [[Cd(L1)(bpy)(NO3)](NO3)(H2O)2]∞ (4) was produced. Complex 1 reacted with 4-((E)- 2-(pyridin-4-yl)vinyl)pyridine (bpe) in ethanol under microwave-heating conditions to produce a dimeric complex [Cd2(L1)2(bpe)(EtOH)2(NO3)2)](NO3)2 (5). Solid-state photoluminescent spectra of all complexes displayed a ligand-based π–π* emission band.
Wang, Di,Yun, Hoseop,Kim, Kang-Woo unknown 2017 ZEITSCHRIFT FUR KRISTALLOGRAPHIE NEW CRYSTAL STRUC Vol.232 No.6
<P>C10H28N2PdSe14, monoclinic, P2(1)/c (no. 14), a=9.4146(7) angstrom, b=14.3446(11) angstrom, c=12.4731(9) angstrom, beta=113.403(2)degrees, V=1545.9(2) angstrom(3), Z=2, R-gt(F)=0.0510, wR(ref)(F-2)=0.1446, T=293 K.</P>
Emodin-nicotinamide (1:2) cocrystal identified by thermal screening to improve emodin solubility
Park, Boosung,Yoon, Woojin,Yun, Jungmin,Ban, Eunmi,Yun, Hoseop,Kim, Aeri Elsevier/North Holland 2019 International journal of pharmaceutics Vol.557 No.-
<P><B>Abstract</B></P> <P>Emodin (EM), an anthraquinone obtained from natural products, is known for many pharmacological activities. However, further evaluation and interpretation of toxicity or pharmacological activity of emodin are limited due to its poor aqueous solubility. We aimed to identify an emodin cocrystal with improved pharmaceutical properties. Among various compounds screened by thermal analysis, nicotinamide (NCT) was identified as a potential cocrystal coformer, based on the presence of an exothermal peak in DSC profiles of the physical mixture of EM and NCT. Crystallization of EM-NCT cocrystal (EM-NCT) using slow or rapid solvent evaporation method yielded a novel cocrystal at 1:2 ratio. Single crystal structure analysis revealed EM dimers and NCT tetramers connected alternatively via H-bonds to make one-dimensional chains which are joined by inter-chain H-bonds between NCT to form two-dimensional layers. The EM molecules are planar with intramolecular H-bonds between O atoms. Compared with EM, the EM-NCT cocrystal showed improved aqueous solubility, dissolution rate, and stability. Hence, EM-NCT cocrystal is proposed as a more suitable solid form for further development as pharmaceutical products.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>