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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>