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Yakiyama, Yumi,Ueda, Akira,Morita, Yasushi,Kawano, Masaki The Royal Society of Chemistry 2012 Chemical communications Vol.48 No.86
<P>A tripyridyl multi-interactive ligand TPHAP is prepared by a one-pot reaction on a gram scale. Network formation of Co(<SMALL>II</SMALL>) with TPHAP<SUP>−</SUP> gave kinetic and thermally more stable products. The kinetic network showed an unprecedented dynamic network transformation on the crystal surface by a ligand exchange reaction.</P> <P>Graphic Abstract</P><P>Co(<SMALL>II</SMALL>) and multi-interactive ligand TPHAP afford a kinetic network followed by ligand exchange mediated dynamic network transformation on the crystal surface. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cc35078e'> </P>
Yakiyama, Yumi,Lee, Gil Ryeong,Kim, Sung Yeon,Matsushita, Yoshitaka,Morita, Yasushi,Park, Moon Jeong,Kawano, Masaki The Royal Society of Chemistry 2015 Chemical communications Vol.51 No.31
<P>Crystalline powders self-assembled from interactive discrete molecules reversibly transformed from a porous structure to a 2D one with a nanometer-thick H<SUB>2</SUB>O layer by hydration/dehydration. Multi-point weak intermolecular interactions contributed to maintenance of each phase. This structure transformation induced a humidity-dependent ion conductivity change from insulator to 3.4 × 10<SUP>−3</SUP> S cm<SUP>−1</SUP>.</P> <P>Graphic Abstract</P><P>Powder analysis revealed that multi-interactive molecules formed an ion conductive nanometer-thick water layer at high humidity and porous insulator by dehydration. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5cc01568e'> </P>
Selective Formation of Conductive Network by Radical-Induced Oxidation
Koo, Jin Young,Yakiyama, Yumi,Lee, Gil Ryeong,Lee, Jinho,Choi, Hee Cheul,Morita, Yasushi,Kawano, Masaki American Chemical Society 2016 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.138 No.6
<P>Cd-based coordination networks having channels were formed selectively by using a redox-active aromatic ligand 2,5,8-tri(4-pyridyl)1,3-diazaphenalene (TPDAP, H(+)1(-)). An electron-conductive network having a pi-pi stacking columnar structure of TPDAP formed in the presence of a trace amount of TPDAP radical (1(center dot)). In contrast, a nonconductive network having a dimer unit of H(+)1(-) formed in the absence of 1(center dot). These results suggest the presence of a unique oxidation mechanism of TPDAP induced by formation of H(+)1(-)-1(center dot) dimer, which was initiated by a trace amount of 1(center dot). The dimerization increased HOMO level of H(+)1(-) moiety within the dimer to generate further radicals that could not form when H(+)1(-) was well isolated in CH3OH.</P>