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Lee, Young Hoon,Kristopo, Hari,Woo, Arim,Won, Mi Seon,Hayami, Shinya,Thué,ry, Pierre,Jung, Ok-Sang,Lee, Hong In,Kim, Bok Jo,Lindoy, Leonard F.,Kim, Yang CSIRO Publishing 2012 Australian journal of chemistry Vol.65 No.7
<P> Two new polyamine ligands, L1 and L2, incorporating pyridyl and aliphatic amine donor sites have been prepared and their reaction with copper(ii) yields the mono- and binuclear complexes [Cu(L1)](ClO4)2 (1) and [Cl2Cu(L2)CuCl(H2O)]ClO4 (2), respectively. The X-ray structure of 1 confirms that the five nitrogen donors of L1 are bound to the central copper ion to give a distorted square pyramidal coordination sphere. In 2, L2 acts as a bridging ligand with its N3-donor coordination domains separated by a m-xylylene spacer group. An unusual feature of this latter complex is that symmetrical L2 gives rise to non-equivalent coordination behaviour at the individual copper sites; while both sites display five-coordination with distorted square pyramidal arrangements, they differ in having N3Cl2- and N3ClO-donor atom sets, respectively. The electron paramagnetic resonance (EPR) spectra of both complexes are discussed. Variable temperature magnetic susceptibility data confirmed the absence of magnetic interactions in 1 while a weak antiferromagnetic interaction between copper(ii) centres occurs in 2. </P>
Grosshauser, Michael,Comba, Peter,Kim, Jee Young,Ohto, Keisuke,Thué,ry, Pierre,Lee, Young Hoon,Kim, Yang,Harrowfield, Jack The Royal Society of Chemistry 2014 Dalton Transactions Vol.43 No.15
<P>A bispidine-like ligand involving four pyridine-N and three aliphatic-N donor atoms forms a bimetallic species with CuCl<SUB>2</SUB> in which all seven N-donors are bound and which aggregates in the crystal through double chloride-bridging to give a tetranuclear unit. The magnetism of this solid can be interpreted in terms of a relatively weak antiferromagnetic coupling between the two Cu(<SMALL>II</SMALL>) centres of the dinuclear subunits and a strong ferromagnetic coupling of the Cu(<SMALL>II</SMALL>) centres in different dinuclear units involved in the bis-chlorido bridge. In solution, the assembly decays into the dinuclear subunits and, in agreement with the solid state studies, the interaction between the corresponding Cu<SUP>II</SUP> centres is shown to be primarily due to dipole–dipole coupling.</P> <P>Graphic Abstract</P><P>A binuclear complex of copper(<SMALL>II</SMALL>) chloride with a heptadentate bispidine-like ligand undergoes dimerisation in the solid state involving chloride bridging and leading to both ferro- and antiferromagnetic coupling of the Cu(<SMALL>II</SMALL>) centres. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4dt00305e'> </P>
Functionalised azetidines as ligands: pyridyl-complemented coordination
Lee, Young Hoon,Harrowfield, Jack,Kim, Yang,Lim, Woo Taik,Park, Yu Cheol,Thué,ry, Pierre Royal Society of Chemistry 2009 Dalton Transactions Vol.2009 No.3
<P>A relatively simple azetidine derivative with 2-aminoethyl and 2-pyridyl substituents functions as a tridentate ligand towards Cu(<SMALL>II</SMALL>), giving species in which the CuN<SUB>3</SUB> unit is essentially planar and that, in the solid state, show a subtle balance between mononuclear and binuclear forms, allowing both to be simultaneously present in some lattices. Displacement of the ligand from Cu(<SMALL>II</SMALL>) by the use of cyanide results in the formation of cyanogen, which appears to slowly react with the free amine to give an oxamidine characterised in its doubly-deprotonated form as its binuclear Ni(<SMALL>II</SMALL>) complex.</P> <P>Graphic Abstract</P><P>A tridentate pyridylazetidine derivative forms binuclear complexes with Cu(<SMALL>II</SMALL>) and terephthalate in which the dicarboxylate is present in two protonation states. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b812295d'> </P>
Final report on APMP regional key comparison APMP.L-K6: Calibration of ball plate and hole plate
Takatsuji, Toshiyuki,Eom, Taebong,Tonmueanwai, Anusorn,Yin, Ruimin,van der Walt, Floris,Gao, Sitian,Thu, Bui Quoc,Singhal, R P,Howick, Eleanor,Doytchinov, Kostadin,Valente de Oliveira, José,Carl Springer-Verlag 2014 METROLOGIA -BERLIN- Vol.51 No.-
<P>The results of the APMP key comparisons on ball plate and hole plate (APMP.L-K6.2007) are reported. Both transfer standards were provided by NMIJ, Japan. The ball plate standard is 532 mm by 532 mm in nominal dimension and 25 spheres are embedded. Thirteen National Metrology Institutes (8 from APMP, 5 from other Regional Metrology Organizations) participated in the ball plate measurement comparison. The hole plate standard is 550 mm by 550 mm in nominal dimension and there are 44 cylindrical holes in it. Nine National Metrology Institutes (5 from APMP, 4 from other Regional Metrology Organizations) participated in the hole plate measurement comparison. The comparison started in May 2006 and finished in October 2008. The participants used different measurement techniques which were used for their routine calibration services. For determining the key comparison reference values, a two-dimensional coordinates-based analysis was performed. The measurement results on the ball plate show good agreement in ten out of thirteen participants. In contrast, those on the hole plate are in agreement for five out of nine participants.</P><P>Main text.To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.</P><P>The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).</P>
Lee, Young Hoon,Harrowfield, Jack M.,Kim, Jong Seung,Kim, Yang,Lee, Min Hee,Lim, Woo Taik,Park, Yu Cheol,Thué,ry, Pierre Royal Society of Chemistry 2009 Dalton Transactions Vol.2009 No.3
<P>Selective functionalisation of the tridentate ligand 1-(2-aminoethyl)-3-methyl-3-(2-pyridyl)azetidine at its terminal amino-nitrogen atom can be readily achieved by both reductive alkylation and simple alkylation reactions to give tri-, quadri-, quinque- and sexi-dentate derivatives. Simple alkylation by 2-picolinyl chloride provides the only example of a second reaction pathway where the azetidine ring of the reactant has undergone activation towards ring opening. Structural characterisation of the Cu(<SMALL>II</SMALL>) complexes of these ligands has revealed several remarkable aspects of their solid-state coordination chemistry, including the formation of infinite helical aggregates through π-stacking and tetramerisation through carboxylate bridging, as well as further examples of the crystallisation of mixed species found to be rather common with complexes of the parent ligand.</P> <P>Graphic Abstract</P><P>Elaboration of a pyridyl–azetidine to obtain ligands of higher denticity enables the formation of a variety of Cu(<SMALL>II</SMALL>) complexes showing unusual solid state structures. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b812298a'> </P>