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(4-Nitro-benzylidene)-(3-nitro-phenyl)-amine 및 trans-Dichlorobis(3-nitroaniline) palladium(II)의 구조
이희근,이순원,Lee Hee K.,Lee Soon W. Korea Crystallographic Association 2005 韓國結晶學會誌 Vol.16 No.1
4-Nitrobenzaldehyde와 3-nitroaniline의 Schiff-base 축합 반응으로 잠재적 연결 리간드 (4-Nitro-benzylidene)-(3-nitro-phenyl)-amine (1)이 합성되었다. 리간드 1과 $PdCl_2(NCPh)_2$ 반응에서 가수 분해로 인한 예상 밖의 생성물 $trans-PdCl_2(NO_2-C_6H_4-NH_2)_2$ (2)가 분리되었다 X-ray 회절법으로 화합물 1과 2가 구조적으로 규명되었다. 화합물 2에서 3-nitroaniline의 $NH_2$ 수소 원자들은 Cl 원자와 분자간 NH${\cdot}\;{\cdot}\;{\cdot}\;$Cl 수소 결합에 참여하고 있다. A novel potential linking ligand (4-nitro-benzylidene)-(3-nitro-phenyl)-amine (1) was prepared from 4-nitrobenzaldehyde and 3-nitroaniline by the Schiff-base condensation. From the reaction between 1 and dichlorobis(benzonitrile)palladium (II) $(PdCl_2(NCPh)_2)$, an unexpected product $trans-PdCl_2(NO_2-C_6H_4-NH_2)_2$ (2) was isolated. Compounds 1 and 2 were structurally characterized by X-ray diffraction. In compound 2, the $NH_2$ hydrogen atoms in the 3-nitroaniline ligand participate in intermolecular N-H${\cdot}\;{\cdot}\;{\cdot}\;$Cl hydrogen bonds.
극저온용 Al-Mg합금 미그 및 플라즈마-미그 하이브리드 용접부 표면에 형성되는 smut 생성 현상 분석
이희근 ( Hee Keun Lee ),윤태진 ( Tae Jin Yoon ),강정윤 ( Chung Yun Kang ) 대한금속재료학회(구 대한금속학회) 2016 대한금속·재료학회지 Vol.54 No.2
Black deposits (smut) are created on MIG welds in cryogenic Al alloys. The smut should be removed because it ruins the appearance of the end product and affects surface treatments such as painting. It was recently reported that plasma-MIG hybrid (PMH) welding controls the formation of smut duringwelding. In order to determine the reason for this, smut formation using both MIG and PMH welding was investigated through metallurgy and arc phenomena analysis. Smut on MIG welds is a Mg-Al-O amorphous layer that includes nano-sized MgO particles less than 100 nm in diameter and MgO particles 1-2 μm in diameter. Smut on MIG welds is created by large amounts of metal vapor from the arc explosion generated between the welding wire and the weld pool after a short circuit transfer. However, smut on PMH welds is not created owing to the small amount of metal vapor produced from a stable globular transfer rather than a short circuit transfer and arc explosion.(Received April 28, 2015)