• Bulletin of the Korean Chemical Society
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• 제29권5호
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• pp.963-968
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• 2008

For the [$Cr_2(H_2tmp)_2Cl_4$] compound, simplified models with two bridging methoxo ligands have been studied. The influence of the bridging Cr-O-Cr bond angles on the exchange coupling between metal atoms in the model compound has been analyzed by means of density functional calculations with the broken-symmetry approach. Coupling constant calculated for the full structure is in good agreement with the experimentally reported value, confirming the validity of the computational strategy used in this work to predict the exchange coupling in a family of related dinuclear Cr(III) compounds. The calculations indicate a good correlation between the calculated coupling constant and the sum of the squared energy gap of three pairs of metal $t_{2g}$ OMSOs with a limited variation of the Cr-O-Cr angle. The spin density distribution and the mechanism of magnetic coupling interactions are discussed.

• 대한화학회지
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• 제29권3호
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• pp.319-327
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• 1985

충진제의 함량, titanate계 coupling agent의 종류, 처리량에 따른 PVC-Ni 복합재의 전기적.기계적 성질을 연구하였다. coupling agents처리에 의해 충진제의 분산상태가 양호해지고, 충진제 표면의 불순물이 대체되어 복합재의 전기저항은 감소되며 기계적 성질을 연구하였다. coupling agent처리에 의해 충진제의 분산상태가 양호해지고, 충진제 표면의 불순물이 대체되어 복합재의 전기저항은 감소되며 기계적 성질들은 향상되나 과량의 coupling agent의 처리는 이들 효과를 상쇄함을 보였다.

• Bulletin of the Korean Chemical Society
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• 제31권12호
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• pp.3749-3754
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• 2010

Various terphenyl and quaterphenyl derivatives were prepared by the Ni-NHC catalyzed cross coupling of the corresponding biphenyl- and terphenyl-sulfonates with arylmagnesium bromides. The reactions proceeded rapidly via a nucleophilic aromatic substitution of the alkoxysulfonyl moieties by the aryl nucleophiles to afford high yields within just 1.5 h at room temperature in spite of the low reactivity of the sulfur electrophiles.

• Bulletin of the Korean Chemical Society
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• 제33권5호
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• pp.1785-1787
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• 2012

• Bulletin of the Korean Chemical Society
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• 제27권9호
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• pp.1473-1476
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• 2006

• Bulletin of the Korean Chemical Society
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• 제34권3호
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• pp.983-985
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• 2013

• Bulletin of the Korean Chemical Society
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• 제35권1호
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• pp.280-282
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• 2014

• Bulletin of the Korean Chemical Society
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• 제23권12호
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• pp.1823-1826
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• 2002

• Bulletin of the Korean Chemical Society
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• 제32권1호
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• pp.359-362
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• 2011

• Bulletin of the Korean Chemical Society
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• 제28권11호
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• pp.1929-1930
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• 2007