• Bulletin of the Korean Chemical Society
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• v.33 no.6
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• pp.2037-2039
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• 2012

• Journal of the Korean Chemical Society
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• v.48 no.2
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• pp.215-219
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• 2004

• Bulletin of the Korean Chemical Society
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• v.15 no.12
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• pp.1112-1118
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• 1994

Epoxidation of olefins has been studied using iodosylbenzene (PhIO) as the terminal oxidant and binuclear and mononuclear complexes of $Mn^{2+}$, $Co^{2+}$, and $Cu^{2+}$ as catalysts. Epoxides were the predominant products with trace amounts of allylic oxidation products, and the metal complexes were found to be effective catalysts in the epoxidation reactions. The reactivity of binuclear copper complexes was greater than that of the mononuclear copper complexes, whereas the binuclear and mononuclear complexes of $Mn^{2+}$ and $Co^{2+}$ showed similar reactivities. The nature of the ligands bound to copper did not influence the reactivity of the binuclear copper complexes so long as copper ions were held in close proximity. A metal-iodosylbenzene complex, such as suggested previously for Lewis acidic metal complex-catalyzed epoxidation by iodosylbenzene, is proposed as the active epoxidizing species. Some mechanistic aspects are discussed as well.

• Bulletin of the Korean Chemical Society
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• v.25 no.3
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• pp.410-412
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• 2004

• Bulletin of the Korean Chemical Society
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• v.30 no.2
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• pp.285-286
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• 2009

• Bulletin of the Korean Chemical Society
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• v.28 no.2
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• pp.343-346
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• 2007

• Bulletin of the Korean Chemical Society
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• v.27 no.2
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• pp.203-207
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• 2006

Isomeric series of dilinked $NO_2S_2$ macrocycles ($L^2$: para-, $L^3$: meta- and $L^4$: ortho-linked) capable of binuclear complexing ability were prepared from its monomeric analog $L^1$ in reasonable yields except ortho-type reaction, which led to mixture due to the formation of monomer-type macrocyclic quaternary ammonium bromide $L^5$. Moreover, L2 (as $2HNO_3$ form) and $L^5$ were confirmed by an X-ray crystallography. Reaction of $HgCl_2$ with $L^2$ yielded a binuclear complex $[Hg_2(L^2)Cl_4]$. In the complex, each mercury(II) has a distorted tetrahedral environment made up of S and N donors from an exodentate $L^2$ and two coordinated Cl atoms.

• Journal of the Korean Chemical Society
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• v.30 no.4
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• pp.345-351
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• 1986

Monoxo-bridged binuclear molybdenum(V) complex, $[Mo_2O_3\;(bipy)_2\;(NCS)_4]$ in aqueous acetone mixture produces the corresponding dioxo-bridged binuclear molybdenum(V) complex, $MoO_4(bipy)_2(NCS)_2$. The rate of conversion of $[Mo_2O_3(bipy)_2(NCS)_4]$ to $MoO_4(bipy)_2(NCS)_2$ has been measured by spectrophotometric method. The rate of formation of dioxo-bridged binuclear molybdenum(V) complexes with solvent water follows the rate law, rate = k$[Mo_2O_3(bipy)_2(NCS)_4]\;[H_2O]$. The reaction mechanism for the formation of dioxo-bridged complex is discussed. The observed negative volume of activation shows that the complex is strongly attracted to the solvent molecules at transition state.

• Bulletin of the Korean Chemical Society
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• v.29 no.12
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• pp.2533-2536
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• 2008

• Journal of the Korean Chemical Society
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• v.38 no.8
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• pp.598-602
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• 1994

Light-induced electron transfer reaction within binuclear complex $(NC)_5FeII-L-CoIII(NH_3)_5$ was studied with steady-state photolysis and the rate constants were measured for various bridging lignands. klight and quantum yields for BP, PHEN, DAP having conjugation between metal binding sites were about $3{\times}10^{-2} sec^{-1}$ and 1, and for BPEA having no conjugation were about $2{\times}10^{-4} sec^{-1}$ and 0.03. Light-induced electron transfer reaction within binuclear complex was proved to be the chemical mechanism which had charge transfer excited state MLCT*.