• Title/Summary/Keyword: Chemistry education

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The Time Correlation Function between Fluctuating Concentrations in the Metabolic System with Negative Feedback

  • Kim, Cheol-Ju;Ko, Seuk-Beum;Lee, Jong-Myung;Jeon, Il-Cheol;Lee, Dong J.;Shin, Kook-Joe
    • Bulletin of the Korean Chemical Society
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    • v.9 no.6
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    • pp.382-384
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    • 1988
  • The explicit form of time correlation function between fluctuating concentrations is obtained for the model of metabolic system with negative feedback near a stable(or marginally stable) steady state.

Crystal Structure, Fluorescence Property and Theoretical Calculation of the Zn(II) Complex with o-Aminobenzoic Acid and 1,10-Phenanthroline

  • Zhang, Zhongyu;Bi, Caifeng;Fan, Yuhua;Zhang, Xia;Zhang, Nan;Yan, Xingchen;Zuo, Jian
    • Bulletin of the Korean Chemical Society
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    • v.35 no.6
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    • pp.1697-1702
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    • 2014
  • A novel complex [$Zn(phen)(o-AB)_2$] [phen: 1,10-phenanthroline o-AB: o-aminobenzoic acid] was synthesized and characterized by elemental analysis and X-ray diffraction single-crystal analysis. The crystal crystallizes in monoclinic, space group P2(1)/c with $a=7.6397(6){\AA}$, $b=16.8761(18){\AA}$, $c=17.7713(19){\AA}$, ${\alpha}=90^{\circ}$, ${\beta}=98.9570(10)^{\circ}$, ${\gamma}=90^{\circ}$, $V=2.2633(4)nm^3$, Z = 4, F(000) = 1064, S = 1.058, $Dc=1.520g{\cdot}cm^{-3}$, $R_1=0.0412$, $wR_2=0.0948$, ${\mu}=1.128mm^{-1}$. The Zn(II) is six coordinated by two nitrogen and four oxygen atoms from the 1,10-phenanthroline and o-aminobenzoic acid to furnish a distorted octahedron geometry. The complex exhibits intense fluorescence at room temperature. Theoretical studies of the title complex were carried out by density functional theory (DFT) B3LYP method. CCDC: 898291.