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S, Sujith,Lee, Bun-Yeoul,Han, Jin-Wook Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.8
New sulfur functionalized cyclopentadiene ligands, 1-[2-(thioanisole)]-2,5-dimethylcyclopentadiene (3), 1-[2- (thioanisole)]-2,3,5-trimethylcyclopentadiene (4), and 1-[2-(thioanisole)]-2,3,4,5-tetramethylcyclopentadiene (5), were prepared. In these ligands, the S-donor atom is connected to a cyclopentadiene ring by a rigid phenylene spacer. CpCo(III)-diiodo half-sandwich complexes (6-8) were obtained from reaction the ligands (3- 5) with Co2(CO)8, followed by treatment of I2. Substitution reaction of CpCo(III)-diiodo complexes with MeLi yielded the corresponding CpCo(III)-dimethyl complexes (9-11). Further transformation to the corresponding cationic cobalt complexes (12-14) were achieved by reaction of the CpCo(III)-dimethyl complexes with HB(ArF)4·2Et2O and trapping with CD3CN. The new sulfur functionalized cyclopentadiene ligands having a rigid phenylene spacer and the corresponding cobalt complexes were characterized by 1H, 13C and 19F NMR spectroscopy. The diiodo Complex 6 was also characterized by a single crystal X-ray diffraction method.
Sujith S,Bun Yeoul Lee*,한진욱 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.8
New sulfur functionalized cyclopentadiene ligands, 1-[2-(thioanisole)]-2,5-dimethylcyclopentadiene (3), 1-[2-(thioanisole)]-2,3,5-trimethylcyclopentadiene (4), and 1-[2-(thioanisole)]-2,3,4,5-tetramethylcyclopentadiene (5), were prepared. In these ligands, the S-donor atom is connected to a cyclopentadiene ring by a rigid phenylene spacer. CpCo(III)-diiodo half-sandwich complexes (6-8) were obtained from reaction the ligands (3-5) with Co2(CO)8, followed by treatment of I2. Substitution reaction of CpCo(III)-diiodo complexes with MeLi yielded the corresponding CpCo(III)-dimethyl complexes (9-11). Further transformation to the corresponding cationic cobalt complexes (12-14) were achieved by reaction of the CpCo(III)-dimethyl complexes with HB(ArF)42Et2O and trapping with CD3CN. The new sulfur functionalized cyclopentadiene ligands having a rigid phenylene spacer and the corresponding cobalt complexes were characterized by 1H, 13C and 19F NMR spectroscopy. The diiodo Complex 6 was also characterized by a single crystal X-ray diffraction method.
S. V. Sujith,Hansoo Kim,Rahul S. Mulik,Hyeonwoo Park,Joonho Lee 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.9
Owing to the high propensity for particle agglomeration, the fabrication of aluminum matrix composites with uniformdistribution using casting routes is extremely difficult. In this study, the in-situ development of the Al3Tireinforcing phaseby employing stir-assisted ultrasonic treatment was utilized to improve the homogeneity, wettability, and thermodynamicstability of the reinforcing particles in an Al-7075 alloy matrix. The in-situ Al3Tiparticles acted as heterogeneous nucleationsites and facilitated grain refinement to form a non-dendritic globular structure compared with the dendritic cells of the basealloy. The grain size of the α-Al dendrites reduced from 160 μm to 65, 50, and 40 μm with the addition of 2, 5, and 7 wt%Al3Ti,respectively. The reduction in the porosity of the composites and the improvement of the particle homogenizationwere due to cavitation-induced de-agglomeration and the degassing effect. The formation of a robust and clean interfacebetween the Al3Tiparticles and Al alloy via ultrasonic vibration improved the integrity of the composites compared withthat of the base alloy. The thermal expansion mismatch between the Al3Tiparticles and Al alloy contributed significantly tothe improved mechanical properties of the composites.
Sujith, S.,Noh, E.K.,Lee, B.Y.,Han, J.W. Elsevier Sequoia 2008 Journal of organometallic chemistry Vol.693 No.12
η<SUP>3</SUP>-benzylnickel complexes of N-heterocyclic carbenes are prepared and characterized in this study. While the imidazolinylidene complexes are inactive, the imidazolylidene-based η<SUP>3</SUP>-benzyl complexes exhibit good activity for norbornene homopolymerization without the requirement of any activator.
S. Shanmughapriya,G. Seghal Kiran,R. Gandhimathi,T. Bastin Baskar,Aseer Manilal,S. Sujith,Joseph Selvin 한국생물공학회 2009 Biotechnology and Bioprocess Engineering Vol.14 No.1
An endosymbiont Halobacterium salinarum MMD047, which could produce high yields of amylase, was isolated from marine sponge Fasciospongia cavernosa, collected from the peninsular coast of India. Maximum production of enzyme was obtained in minimal medium supplemented with 1% sucrose. The enzyme was found to be produced constitutively even in the absence of starch. The optimum temperature and pH for the enzyme production was 40℃ and 8.0, respectively. The enzyme exhibited maximum activity in pH range of 6~10 with an optimum pH of 9.0. The enzyme was stable at 40℃ and the enzyme activity decreased dramatically above 50℃. Based on the present findings, the enzyme was characterized as relatively heat sensitive and alkalophilic amylase which can be developed for extensive industrial applications.