http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
열장 흐름 분획법에서 중력효과에 의한 고분자의 머무름 거동에 관한 연구
류기석,송병수,박종원,민병열,Ryoo, Ki-Seok,Song, Byoung-Su,Park, Jong-Won,Min, Byoung-Ryul 대한화학회 1995 대한화학회지 Vol.39 No.11
평판형 열장흐름분획법에서 중력효과에 의한 polystyrene(PS)와 polymethylmethacrylate(PMMA)의 머무름 거동에 관하여 연구하였다. 하향 이동상 흐름의 경우 이동상 흐름 방향과 같은 방향으로 작용하는 중력 효과는 수평면 으로부터 장치각도가 0.deg.에서 60.deg.까지 변화함에 따라 증가하였다. 이 효과는 PS와 PMMA의 머무름 시간을 작게 하였고, 무차원 변수 .lambda.의 값을 증가시켰다. 그리고 분자량이 다른 두개의 고분자 머무름 시간차를 감소시켜 분리기능 저하시켰다. 상향 이동상 흐름의 경우 이동상 흐름의 반재 방향으로 작용하는 중력 효과는 수평면으로부터 장치의 각도가 0.deg.에서 60.deg.까지 증가함에 따라 증가하였다. 이 효과는 PS와 PMMA의 머무름 시간을 크게 하였고, 무차원 변수.lambda.의 값을 감소 시켰다. 그리고 분자량이 다른 두 개의 고분자 머무름 시간 차를 증가시켜 분리능을 향상시켰다. The influence of gravitational effect on the retention behaviors of polystyrene (PS) and polymethylmethacrylate (PMMA) in flat type thermal field flow fractionation (Thermal FFF) was studied. In the case of downward flow of mobile phase, the gravitational effect acting in the same direction of mobile phase flow increases as the angle of the system from the horizontal line (0˚to 60˚) increases. The decreasement of retention time of PS & PMMA was found. Also, the increasement of dimensionless λ values was found. And the difference in the retention time of PS & PMMA having different molecular weight decreases and also the resolution decreases. In the case of upward flow of mobile phase, the gravitational effect acting in the opposite direction of mobile phase flow increases as the angle of the system from the horizontal line (0˚to 60˚) increases. The increasement of retention time of PS & PMMA was found. Also, the decreasement of dimensionless λ values was found. And the difference in the retention time of PS & PMMA having different molecular weight increases and also the resolution increases.
Ryu, KiSeok,Song, Jeonghoon,Kang, Shin-Geol 大邱大學校附設 基礎科學硏究所 1998 基礎科學硏究 Vol.15 No.2
New five-coordinate copper(II) complexes [Cu(L)(X)]^(+) (L=2, 3, 4, or 5; X^(-)=Cl^(-), Br^(-), SCN^(-), or N₃^(-)) have been prepared by the reactions of the pentaaza macrocyclic complexes [Cu(L)]^(2+) with NaX. The complexes [Cu(L)(X)]^(+), in which the anion X^(-) is coordinated to the metal ion, have square-pyramidal coordination geometry. The complexes [Cu(L)(X)]^(+) dissolve in water to give mixtures of the square-pyramidal and square-planar [Cu(L)]^(2+) species. The equilibrium for the copper(ll) complexes in NaX aqueous solutions has been examined. The equilibrium constants (K) are affected by the nature of the anions and the structure of the macrocyclic ligands. Synthesis, characterization, and solution behaviors of the square-pyramidal copper(II) complexes are described.
Kang, Shin-Geol,Ryu, Kiseok,Song, Jeonghoon 大邱大學校附設 基礎科學硏究所 1998 基礎科學硏究 Vol.15 No.1
The one-pot reaction of ethylenediamine, formaldehyde, and 2-(2-aminoethoxy)ethanol in the presence of Ni^(2+) or Cu^(2+) ion produces the square-planar nickel(ll) or copper(ll) complex of the 14-membered hexaaza macrocyclic ligand 1,8-bis{2-(2-hydroxylethoxy) ethyl)-1,3,6,8,10,13-hexaazacyclodecane (1), in which two (CH₂)₂O(CH₂)₂OH functional groups are appended to the uncoordinated nitrogen atoms. The spectroscopic and chemical properties of [Ni(1)]^(2+) and [Cu(1)]^(2)+ indicate that the hydroxyl groups of the complexes are not directly involved in coordination. Synthesis, characterization, and properties of the new complex are reported.
Kang, Shin-Geol,Ryu, Kiseok,Song, Jeonghoon 大邱大學校附設 基礎科學硏究所 1998 基礎科學硏究 Vol.15 No.1
A new square-planar copper(II) complex of the non-macrocyclic ligand 1-(2-aminoethyl)-3-(N-{2-aminopropyl}aminomethyl)1,3-diazacyclohexane(2) has been prepared by the metal template condensation of 1,4,8-triazaoctane, 2-aminopropane, and formaldehyde. The reaction of the copper(II) complex [Cu(2)]^(2+) with formaldehyde and nitroethane or 1-nitropropane produces the pentaaza macrocyclic complex [Cu(5)]^(2+) (5=5, 8-dimethyl-8-nitro-1,3,6,10,13-pentaazabicyclo[11.3.1]heptadecane) or [Cu(6)]^(2+) (6=5-methyl-8-ethyl-8-nitro-1,3,6,10,13-pentaazabicyclo[11.3.1]-heptadecane), respectively. The macro-cyclic ligands 5 and 6 contain two C-alkyl groups and one nitro group, together with the 1,3-diazacyclohexane ring. The macrocyclic copper(II) complexes have square-planar coordination geometry with a 5-6-5-6 chelate ring sequence. Synthesis, characterization, and properties of the pentaaza non-macrocyclic and macrocyclic copper(II) complexes are described.
14각형 테트라아자 거대고리 니겔(II) 착물의 염기성 수용액에서의 거동 : 물 분자의 배위에 미치는 수산화 이온의 영향
강신걸,김성진,류기석 大邱大學校附設 基礎科學硏究所 1997 基礎科學硏究 Vol.14 No.1
Nickel(II) complexes of the 14-membered tetraaza macrocyclic ligands 1 and 2 exist in aqueous solutions as a mixture of the square-planar [Ni(L)12 (L = 1 or 2) and octahedral species [Ni(L)(H20)2l2'. The equilibrium for the complexes of 1 and 2 in basic aqueous solutions has been examined. The addition of hydroxide ion to aqueous solutions of [Ni(1)]'' shifts the equilibrium to the octahedral side; the role of hydroxide ion is opposite to that of other anion such as N03 , Cl , Br , or C104 , which shifts the equilibrium to the square-planar side. However, in the case of the nickel(II) complex of 2, the proportion of the octahedral species is not affected by the variation of the concentration of hydroxide ion. The roles of hydroxide ion as well as the effects of ligand structure on the solution behaviors of the nickel(II) complexes are discussed.