http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Styrene Epoxidation over Cobalt Cyclam Immobilized SBA-15 Catalyst
Sujandi,Prasetyanto, Eko Adi,Han, Sang-Cheol,Park, Sang-Eon Korean Chemical Society 2006 Bulletin of the Korean Chemical Society Vol.27 No.9
Cobalt (cyclam) complex has been successfully immobilized onto SBA-15, and proven to be an active catalyst for the epoxidation of styrene with tert-butyl hydroperoxide as a terminal oxidant. The selectivity for styrene oxide was observed to be up to 66% with 40% styrene conversion after 12h reaction time. The reversible redox cycle between Co(III) and Co(II) couple which was supposed to play key role during the epoxidation reaction was supported by a cyclic voltametry analysis. The textural properties of the catalyst was characterized by XRD, N2 adsorption-desorption, and TEM analysis.
Sujandi,Park, Sang-Eon,Han, Dae-Soo,Han, Sang-Cheol,Jin, Myung-Jong,Ohsuna, Tetsu Royal Society of Chemistry 2006 Chemical communications Vol.2006 No.39
<P>Amino-functionalized SBA-15 type mesoporous silicas having unique hexagonal platelet morphologies with short channels (100–300 nm) running parallel to the thickness of the nanostructured hexagonal platelet type morphologies have been directly synthesized by co-condensation of aminopropyltriethoxysilane (APTES) and sodium metasilicate as a silica source in the presence of Pluronic P123 triblock copolymer as a structure directing agent.</P> <P>Graphic Abstract</P><P>Amino-functionalized SBA-15 having an unusually wide and thin hexagonal platelet morphology with submicrometer length (100–300 nm) pore channels running parallel to the thickness of the hexagonal plates has been synthesized directly using microwave irradiation. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b608463j'> </P>
Fuctionalization of SBA-16 Mesoporous Materials with Cobalt(III) Cage Amine Complex
Han, Sang-Cheol,Sujandi, Sujandi,Park, Sang-Eon Korean Chemical Society 2005 Bulletin of the Korean Chemical Society Vol.26 No.9
Surface modification of tridimensional cubic mesoporous silica, SBA-16, was investigated with pendant arm functionalized cobalt diaminosarcophagine (diAMsar) cage complex which covalently grafted onto the silica surface through the silication with sylanol group. The spectroscopic results showed that the mesoporous structure was preserved under the $[Co(diAMsar)]^{3+}$ grafting reaction condition. Successful grafting prevented the cobalt diAMsar cage from leaching out from the SBA-16 support.
Prasetyanto, Eko Adi,Sujandi, Sujandi,Lee, Seung-Cheol,Park, Sang-Eon Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.12
MALDI-TOF-MS technique was applied to obtain structural and compositional information of synthetic polyamides, Nylon6 and Nylon66. Mass spectra of both the original and the hydrolyzed polyamide samples were analyzed using the self calibration method as well as the internal calibration method with the standard materials of known masses. The MALDI-TOF mass spectra of Nylon6 samples showed the presence of protonated, sodiated, and potassiated ions that were assigned to cyclic and NH2/COOH terminated linear oligomers. From the MALDI-TOF mass spectra of Nylon66 samples, the potassiated linear oligomers with three different end groups are identified as well as the cyclic oligomers, i.e., NH2/COOH terminated oligomers, NH2/NH2 terminated oligomers, and COOH/COOH terminated oligomers. Full characterization of the molecular species and end groups present in the polyamide samples has been achieved, and also the changes in mass spectral patterns after the hydrolysis of the samples are presented.
A Functionalised Macrobicycle Complex Available for Surface Immobilisation and Protein Grafting
Bernhardt, Paul V.,Harrowfield, Jack M.,Kim, Yang,Lee, Young-Hoon,Park, Yu-Cheol,Sujandi, Sujandi Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.4
The conversion of both the racemic and resolved forms of the Co(III) complex of an hydroxymethyl-substituted tripodal hexamine to macrobicycles via reaction with formaldehyde and nitromethane (and subsequent reduction of the product) has been conducted. The prospect is that it will provide cage complexes in which the hydroxyl substituent is sufficiently remote from the metal ion centre for its nucelophilicity to be largely unaffected. X-ray structure determinations have been used to characterise these new cage species as well as some complexes of the precursor hexamine and its mono-aminal. The electrochemistry and optical activity of the complexes have also been studied in detail.
박상언,Sujandi 한국물리학회 2008 Current Applied Physics Vol.8 No.6
Among the various green keys, catalysis, especially using heterogeneous catalysts, has been powerfully applied to achieve greener chemical processes. Here are presented nanoporous materials which have mesoporosity with the functional groups on the inner pore walls. The materials were synthesized via a rather greener process, such as microwave synthesis, and over these nanocatalysts some of the green chemical reactions were carried out with high activities and selectivities. Cobalt species has been successfully functionalized and stabilized as a Co(III) complex onto SBA-15 support and proven to be an active catalyst in alkylaromatic oxidation with molecular oxygen, styrene epoxidation with tert-butyl hydroperoxide (TBHP), and allylic oxidation of cycloolefins with H2O2. Short-channeled amino-functionalized SBA-15 catalyst with hexagonal plate morphology was synthesized directly by using microwave synthesis from the co-condensation of aminopropyl triethoxysilane (APTES) and sodium metasilicate under a strong acidic condition. The catalyst showed high catalytic activity in liquid-phase Knoevenagel condensation reactions, due to easy diffusion and mass transfer of substrates into the short mesopore channel. The HO3S–SBA-15 was prepared by grafting of mercaptopropyl trimethoxysilane onto the calcined mesoporous silica surface and subsequently oxidized with H2O2. The resulting catalyst was applied as a Bronsted solid-acid catalyst for the esterification of oleic acid with methanol.