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Hyosun Lee

Hyosun Lee

Kyungpook National University, Republic of Korea

Title: Catalytic study of late transition metal complexes in the polymerization of methyl methacrylate

Biography

Hyosun Lee has completed her PhD from Columbia University, New York in the year 1999 and Post-doctoral studies from the Northwestern University, USA. She came back to Korea and continued her Research at LG Chem., Research Park for 5 years. She joined the faculty of Kyungpook National University, Daegu as an Assistant Professor in 2006 and was promoted to Associate Professor and Professor in 2010 and in 2014, respectively. She is now serving as the Chairman of the Department from 2014 – 2016. Her research interests can be described generally as the design, structure, and synthesis of new coordination complexes and organometallics with interesting properties and mechanistic aspect, and the study of catalysis.

Abstract

We have prepared and screened cobalt(II), copper(II), zinc(II), palladium(II), and cadmium(II) complexes with several groups of a series of ligands, namely, N,N'-bidentate N-cycloalkyl 2-iminomethylpyridine (group LA), N,N’-bidentate derivatives of N-(pyridin-2-ylmethyl)aniline (group LB), N,N’,N-tridentate N,N-di(2-picolyl)cycloalkylamine (group LC), N,N’,X-tridentate N-substituted 2-iminomethylpyridine and 2-iminomethylquinoline (group LD), N,N'-bidentate N,N-bis[(1H-pyrazol-1-yl)methyl]amines (group LE), and N,N',N-tridentate N’-substituted N,N-bis[(1H-pyrazol-1-yl)methyl]amines (group LF). All these complexes were characterized by spectroscopic methods and X-ray crystallography and applied to catalytic polymerization of Methyl Methacrylate (MMA). Specifically, cobalt(II) and cadmium(II) complexes showed the highest catalytic activity for MMA polymerization in the presence of modified Methylaluminoxane (MMAO) when compared to the corresponding complexes with same ligand system and metal starting materials, such as [CoCl2•6H2O], [CuCl2•2H2O], [ZnCl2], [Pd(MeCN)2Cl2], and [CdBr2•4H2O]. Their activity were in the order of 105 (g PMMA)/(mol cat) h at 60°C and syndiotacticity of poly(methylmethacrylate) (PMMA), characterized by 1H NMR spectroscopy, was Ca 0.73.