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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.
Development of Tungsten Electrode for TIG Welding
이희근,윤광희,강정윤 대한용접·접합학회 2022 대한용접·접합학회지 Vol.40 No.4
Tungsten Inert Gas (TIG) welding process is mostly applied to high alloy steel pipes including stainless steels be- cause of superior welding quality and gap bridge-ability than other welding processes. However, it has poor pro- ductivity due to low welding speed and deposition rate. In order to improve TIG welding productivity, high perform- ance TIG welding with higher arc temperature, automation and high deposition rate system including hot wire have been developed. Higher arc temperature and longer welding time damage tungsten electrodes of TIG welding. It causes welding defect such as tungsten inclusion and short replacement cycle of tungsten electrodes. Various types of tungsten electrodes containing rare earth metal oxides (thorium, lanthanum, cerium, etc) were introduced to im- prove electrode erosion resistance and arc stability. In this study, their operation characteristics, arc starting perform- ance, tip development, and electrode consumption were reviewed.