A new series of cyanide-bridged assemblies,{KH[Ln_(2)(2,3-pzdc)_(2)(CH_(3)OH)(H_(2)O)_(7)][M(CN)_(8)]}·5H_(2)O(Ln^(3+)=Nd,Gd,Tb,and Dy;M^(4+)=Mo and W),were synthesised by self-assembling lanthanide ions and octa...A new series of cyanide-bridged assemblies,{KH[Ln_(2)(2,3-pzdc)_(2)(CH_(3)OH)(H_(2)O)_(7)][M(CN)_(8)]}·5H_(2)O(Ln^(3+)=Nd,Gd,Tb,and Dy;M^(4+)=Mo and W),were synthesised by self-assembling lanthanide ions and octacyanometallate ions in the presence of pyrazine-2,3-dicarboxylic acid(2,3-H_(2)pzdc).These compounds have a 3D structure in which octagon-like Ln_(4)M_(4)(CN)_(8)rings are connected through a second Ln^(3+)center via the carboxylate groups of one 2,3-pzdc.The resulting 1D channels are filled with K^(+)ions and lattice water molecules.The temperature and field dependent magnetization studies as well as ab initio calculations indicate weak ferromagnetic interactions between the Gd^(3+)ions within the GdMo compound whilst no magnetic interactions exist in GdW analogues.The magnetic properties of Nd^(3+),Tb^(3+)and Dy^(3+)compounds are strongly dominated by the magnetic anisotropy of the lanthanide ions,irrespective of the octacyanometallate building-block used.展开更多
基金China Scholarship Council for a PhD fellowshipthe MINECO for a Juan de la Cierva research fellowship+1 种基金the support of Romanian UEFISCDI,grant PCE108/2017partially funded by the MCCC(CTQ2016-75671-P)。
文摘A new series of cyanide-bridged assemblies,{KH[Ln_(2)(2,3-pzdc)_(2)(CH_(3)OH)(H_(2)O)_(7)][M(CN)_(8)]}·5H_(2)O(Ln^(3+)=Nd,Gd,Tb,and Dy;M^(4+)=Mo and W),were synthesised by self-assembling lanthanide ions and octacyanometallate ions in the presence of pyrazine-2,3-dicarboxylic acid(2,3-H_(2)pzdc).These compounds have a 3D structure in which octagon-like Ln_(4)M_(4)(CN)_(8)rings are connected through a second Ln^(3+)center via the carboxylate groups of one 2,3-pzdc.The resulting 1D channels are filled with K^(+)ions and lattice water molecules.The temperature and field dependent magnetization studies as well as ab initio calculations indicate weak ferromagnetic interactions between the Gd^(3+)ions within the GdMo compound whilst no magnetic interactions exist in GdW analogues.The magnetic properties of Nd^(3+),Tb^(3+)and Dy^(3+)compounds are strongly dominated by the magnetic anisotropy of the lanthanide ions,irrespective of the octacyanometallate building-block used.
