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Kim, Eui-Jong,Kim, Pyosang,Lee, Chi-Hwa,Sung, Jooyoung,Yoon, Hongsik,Kim, Dongho,Jang, Woo-Dong The Royal Society of Chemistry 2012 Chemical communications Vol.48 No.45
<P>A new type of porphyrin ligand bearing four triazole groups at the <I>ortho</I>-positions of phenyl rings in tetraphenylporphyrin was synthesized for the formation of monoporphyrinate lanthanide complexes without ancillary ligands.</P> <P>Graphic Abstract</P><P>A new type of porphyrin ligand bearing four triazole groups at the <I>ortho</I>-positions of phenyl rings in tetraphenylporphyrin was synthesized for the formation of monoporphyrinate lanthanide complexes without ancillary ligands. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cc31015e'> </P>
Kim, Pyosang,Sung, Jooyoung,Uoyama, Hiroki,Okujima, Tetsuo,Uno, Hidemitsu,Kim, Dongho American Chemical Society 2011 The journal of physical chemistry. B, Condensed ma Vol.115 No.14
<P>We have investigated the role of fused benzo rings on the electronic structures and intramolecular energy relaxation dynamics in a series of benzoporphyrins (<B>Bp1</B>, <I>syn</I>-<B>Bp2</B>, <I>anti</I>-<B>Bp2</B>, <B>Bp3</B>, and <B>Bp4</B>) by using time-resolved fluorescence measurements and theoretical calculations. Interestingly, even though <I>anti</I><B></B>- and <I>syn</I><B></B>-<B>Bp2</B> have the same number of fused benzo rings, in the respective absorption spectra, <I>anti</I><B></B>-<B>Bp2</B> shows an obvious splitting of B<SUB><I>x</I></SUB> (Q<SUB><I>x</I></SUB>) and B<SUB><I>y</I></SUB> (Q<SUB><I>y</I></SUB>) states, whereas <I>syn</I>-<B>Bp2</B> exhibits degenerate B and Q bands. These features provide two dynamical models for the effect of the position of substituted benzo rings on the intramolecular energy relaxation dynamics. <I>syn</I>-<B>Bp2</B> gives rise to similar intramolecular dynamics from the B state to the Q state in the case of <B>ZnTPP</B> having <I>D</I><SUB>4<I>h</I></SUB> molecular symmetry. On the other hand, <I>anti</I>-<B>Bp2</B> shows split B and Q bands in the order B<SUB><I>y</I></SUB> > B<SUB><I>x</I></SUB> > Q<SUB><I>x</I></SUB> > Q<SUB><I>y</I></SUB>, which leads a superimposition of the Q<SUB><I>x</I></SUB> (0,0) and Q<SUB><I>y</I></SUB> (1,0) bands. This overlap generates a strong coupling between these two states, which results in a direct internal conversion from B<SUB><I>x</I></SUB> (0,0) to Q<SUB><I>y</I></SUB> (0,0). This observation suggests that the anti-type fused position of benzo rings leads to a new mechanism in internal conversion from the B to the Q state. On the basis of this work, further insight was obtained into the effect of fused benzo rings on the photophysical properties of benzoporphyrins, providing a detailed understanding of the structure−property relationship in a series of benzoporphyrins.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpcbfk/2011/jpcbfk.2011.115.issue-14/jp200493p/production/images/medium/jp-2011-00493p_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp200493p'>ACS Electronic Supporting Info</A></P>
Shape-dependent two-photon absorption in two-dimensionally extended benzoporphyrin arrays
Kim, Pyosang,Ham, Sujin,Oh, Juwon,Uoyama, Hiroki,Watanabe, Hajime,Tagawa, Kazunari,Uno, Hidemitsu,Kim, Dongho The Royal Society of Chemistry 2013 Physical chemistry chemical physics Vol.15 No.26
<P>In this study, we have investigated the shape-dependence of TPA cross-section values of two-dimensionally extended benzoporphyrin arrays to determine the relationship between the directionality of π-conjugation pathways and TPA properties.</P> <P>Graphic Abstract</P><P>In this study, we have investigated the shape-dependence of TPA cross-section values of two-dimensionally extended benzoporphyrin arrays to determine the relationship between the directionality of π-conjugation pathways and TPA properties. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cp50166c'> </P>
Excited-state energy relaxation dynamics of triply linked Zn(<small>II</small>) porphyrin arrays
Kim, Pyosang,Ikeda, Toshiaki,Lim, Jong Min,Park, Jaeheung,Lim, Manho,Aratani, Naoki,Osuka, Atsuhiro,Kim, Dongho Royal Society of Chemistry 2011 Chemical communications Vol.47 No.15
<P>In this study, we have investigated the excited-state energy deactivation dynamics of extended π-conjugated molecular systems that consist of competitive electronic and vibrational relaxation processes.</P> <P>Graphic Abstract</P><P>We have investigated the excited-state energy deactivation dynamics of extended π-conjugated molecular systems that consist of competitive electronic and vibrational relaxation dynamics. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1cc10521c'> </P>
김표상(Pyosang Kim),김현수(Hyeonsu Kim),이용문(Yongmoon Lee),성동훈(Donghoon Seoung) 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10
Smectite group은 2차원 적층 판상광물에 해당하는 phyllosilicate 광물군으로, 대표적인 광물은 Montmorillonite, Beidellite, Nontronite등이 있다. Smectite Group 내 광물분류는 사면체 및 팔면체 내부 이온의 치환으로 이루어지는 화학적 조성변화에 의해 구별된다. Smectite 광물군은 다양한 연구가 진행되고 있으며, 최근 실시간 X-선 회절분석을 이용하여 온도, 압력 하에서의 다양한 물성연구가 진행되고 있다. 본 연구에서는 Smectite 광물군 중 Beidellite, Montmorillonite, Nontronite 광물을 고압환경 하에서 무수 및 유수 환경을 모사하여 실험을 진행하였다. 실리콘 오일 PTM (Pressure transmitting midium)을 사용한 무수압력 환경에서는 Beidellite, Montmorillonite, Nontronite 세 광물 모두 점진적 단위포(unit-cell) 부피의 감소가 관찰되며, 3차 증류수를 사용한 유수압력 환경의 경우 약 1.5 GPa 압력하에서 ICE-Ⅵ에서 ICE-Ⅶ으로의 변화를 수반하여, 수화환경이 정압 환경(hydrostatic)에서 준정압 환경으로 변화함에 따라 급격한 체적탄성계수 변화가 관찰된다. 계산된 체적탄성계수는 무수압력하에서 Beidellite 38(1) GPa, Montmorillonite 31(2) GPa, Nontronite 26(1) GPa이었으며, 유수압력하에서의 체적탄성계수는 정압환경인 1.5 GPa이전에 각각 Beidellite 13(1) GPa, Montmorillonite 13(2) GPa, Nontronite 17(2) GPa에서 준정압환경에서 Beidellite 17(1) GPa, Montmorillonite 20(1) GPa, Nontronite 21(1) GPa로 계산되었다.
Comparative compressional behavior of Zeolite-W with different extra-framework cations
Hyeonsu Kim,Pyosang Kim,Donghoon Seoung,Yongmoon Lee 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10
Zeolite, one of microporous materials, has been widely studied for industrial application such as catalysts or adsorbent due to its size- and shape-selective property. Many experiments of zeolites have addressed the physio-chemical properties in ambient and non-ambient condition. High-pressure researches have been carried out in the last decades and shedded a new sights into phase stability and elastic behavior in response to adopting pressure and pressure-transmitting media (PTM). Zeolite-W is one of small pore zeolites and synthetic phase which has same framework with natural zeolite, Merlinoite (MER, (K,Na)5Ca,Ba)₂Al9Si23O64·23H₂O). We have prepared several extra-framework cation, EFC, analogues (K<SUP>+</SUP>: K-MER, Na<SUP>+</SUP>: Na-MER, Ag<SUP>+</SUP>: Ag-MER, NH₄<SUP>+</SUP>: NH₄-MER) of Zeolite-W by synthesis and cation-exchange method. Chemical composition of prepared samples was confirmed from Energy dispersive X-ray spectroscopy and Thermal Gravimetric Analysis. Compressional behavior of monovalent cation forms up to 5.22 GPa at room temperature is investigated by synchrotron X ray powder diffraction at 3D and 5A beamlines. We use a diamond-anvil cell as a pressurizing tool and water as PTM. In all cases, unit cell constants slightly increase in wet condition and then gradually decrease by pressure without phase transition. Calculated bulk modulus is 37(3) GPa, 38(4) GPa, 49(2) GPa, 47(3) GPa in order of Na-MER, Ag-MER, K-MER, NH4-MER, and it reveals that (in)compressibility is related to extra-framework cation size. Further understanding in atomic scale, Rietveld refinement is ongoing.