다음주 목요일(3월27일)에 세미나가 개최됩니다. 많은 참석 부탁드립니다.감사합니다. ========================= 제 목 : Torsionally-Responsive Molecules and Assemblies: Mechanism-Based Design of Fluorescent Sensors and Switches 연 사 : 이동환 교수(서울대학교) 일 시 : 2014년 3월 27일(목) 오후 4시 30분 장 소 : 화학관 세미나실 (330226호실) ------------------------- Torsionally-Responsive Molecules and Assemblies: Mechanism-Based Design of Fluorescent Sensors and Switches Dongwhan Lee Department of Chemistry, Seoul National University, Seoul, KOREA 151-747 firstname.lastname@example.org An increasing number of functional materials are built with π-conjugated chemical architectures. The practical utility of such constructs derives from rich optical and electrochemical properties that are inherent to their extended electronic structures, and the ability to manipulate them by either covalent or non-covalent synthetic modifications. Taking inspirations from the mode of operation of certain transmembrane protein complexes, we have devised a simple mechanical coupling scheme that correlates torsional motions of multiple aromatic groups that interact through a symmetric array of hydrogen bonds. The assembly and disassembly of multiple non-covalent contacts within such branched π-conjugation result in a dramatic switching of fluorescence properties. Taking this concept a step further, we are currently exploring stimuli-responsive chromophores and receptors, in which restricted torsional motions along the π-conjugated molecular backbone can be exploited for reactivity-based detection of biologically/environmentally relevant molecules and ions. In this presentation will be discussed the advent of this chemistry, its current progress, and future developments.
3월 21일 금요일에 해외석학 특별초청세미나가 개최됩니다. 많은 참석 바랍니다. ------------------------- 제 목 : Metal Cluster Catalyst for Transesterification and Amide Alcoholysis 연 사 : Prof.Kazushi Mashima(오사카 대학교) 일 시 : 2014년 3월 21일(금) 오후 4시 30분 장 소 : 화학관 세미나실 (330226호실) ------------------------- Metal Cluster Catalyst for Transesterification and Amide Alcoholysis Kazushi Mashima Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560‑8531, Japan. Email: email@example.com The ester moiety represents one of the most ubiquitous functional groups in organic compounds, serving as both key intermediate and protecting group in organic transformations. Among various esterification reactions established so far, one of the most convenient synthetic methods is transesterification, in which methyl or ethyl esters react with various alcohols to give the corresponding esters in one step. We developed -oxo-tetranuclear zinc cluster Zn4(OCOCF3)6O as an efficiently catalyst for transesterification, including chemoselective acylation of hydroxy group in the presence of aliphatic amino group, catalytic acetylation of alcohols and catalytic deacetylation of acetates. Because of mildness of the reaction conditions, these reactions have a high degree of functional-group tolerance. Recently, cobalt clusters mediate the same chemoselectivity for transesterification. Amide bond formation and degradation are also discussed.
3월 20일 목요일에 화학과 정규세미나가 개최됩니다.
많은 참석 부탁드립니다.감사합니다.
제 목 : 1-Sulfonyl-1,2,3-triazole: precursors for Rh(II)-azavinyl carbenes
연 사 : 유은정 교수(강원대학교)
일 시 : 2014년 3월 20일(목) 오후 4시 30분
장 소 : 화학관 세미나실 (330226호실)
1-Sulfonyl-1,2,3-triazole: precursors for Rh(II)-azavinyl carbenes
Eun Jeong Yoo
Department of Chemistry, Kangwon National University, Chuncheon 200-701, Republic of Korea
세미나가 이번주 목요일(3월 6일)에 개최됩니다.
많은 참석 부탁드립니다.감사합니다.
제 목 : Nanodevice-Based Molecular Detection: Focused on the Nanogap Biosensor
연 사 : 윤완수 교수님(성균관대학교)
일 시 : 2014년 3월 6일(화) 오후 4시 30분
장 소 : 화학관 세미나실 (330226호실)
Nanodevice-Based Molecular Detection: Focused on the Nanogap Biosensor
세미나가 다음주 화요일(1월 21일)에 개최됩니다. 많은 참석 부탁드립니다.감사합니다.========================= 제 목 : Exceptional catalytic activities of novel QDots formed by sub-nanometric metal (0) clusters연 사 : Prof. M.Arturo López-Quintela(University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain)일 시 : 2014년 1월 21일(화) 오후 4시 장 소 : 화학관 세미나실 (330226호실)------------------------- Exceptional catalytic activities of novel QDots formed by sub-nanometric metal (0) clusters M.Arturo López-Quintela Laboratory of Magnetism and Nanotechnology (Nanomag), Technological Research Institute, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain. Green chemistry and energy conversion are two of the main topics, which will be preferentially addressed in the next years in order to resolve two main problems of the current society: pollution and energy supply. In both areas the main difficulties, which have to be resolved, are related to the poor efficiency of the current catalysts. Although in the past years a lot of work has been dedicated to tackle such problem very little improvements were achieved. Therefore, there is an urgent need of looking for new strategies to overcome the current difficulties. We have seen very recently that Au metal clusters, formed by a few number of atoms, are extremely active catalysts, reaching in some cases enzymatic activities for aerobic oxidation reactions1. At the same time, such clusters, although formed by metal elements, they display semiconductor-like properties, whose band gap can be fine tuned by changing only one atom in the cluster, so that they could be also essayed as photocatalysts. We have indeed observed that clusters can also be used as very efficient photocatalysts for water splitting 2 and the destruction of pollutants. Therefore, the use of these few-atom compounds can open new ways to overcome the current difficulties found with the common catalysts. In this talk it will be presented an overview of the state-of-the art of the catalytic properties of clusters focussing into the fields of self-cleaning, water splitting and aerobic oxidation. We want to acknowledge the financial support of the MCI, Spain (MAT2010-20442; MAT2011-28673-C02-01), MINECO, Spain (MAT2012-36754-C02-01), Xunta de Galicia (Grupos Ref.Comp.,GRC2013-044, FEDER Funds) and Obra Social Fundación La Caixa (2012-CL097).