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Four 3D coordination polymers based on layers with single syn–anti carboxylate bridges: synthesis, structures, and magnetic properties

机译:四种基于3D配位聚合物的结构,具有单抗羧酸盐桥:合成,结构和磁性

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Four novel coordination polymers (CPs) based on a new 4-(3,5-dicarboxylphenyl) picolinic acid ligands (H _(3) L), [M _(3) (L) _(2) (H _(2) O) _(6) ]·4H _(2) O (M _(3) = Mn _(3) , 1 ; Co _(3) , 2 ; Ni _(3) , 3 , Co _(1.01) Ni _(1.99) , 4 ), have been hydrothermally synthesized, and structurally and magnetically characterized. In these isomorphous CPs, octahedrally coordinated metal ions are linked by the single syn – anti carboxylate bridge (μ-COO) to give linear trinuclear motifs. The motifs are connected through the other single syn – anti carboxylate bridge (μ-COO) to give a 2D (4,4) layer, and the layers are interlinked by the L ligands into 3D frameworks. Magnetic measurement indicates that antiferromagnetic interactions between metal ions are mediated through the single syn – anti carboxylate bridges in 1 and 2 , while the same carboxylate bridges in 3 transmit ferromagnetic couplings. The bimetallic CP 4 shows interesting complicated magnetic behaviors due to the competition effect of Co( II ) and Ni( II ) ions.
机译:基于新的4-(3,5-二羧基苯基)吡啶甲酸配体(H _(3)L),[M _(3)(L)_(2)(H _(2 )O)_(6)]·4H _(2)O(M _(3)= Mn _(3),1; Co _(3),2; Ni _(3),3,Co _(1.01 Ni_(1.99),4),已经水热合成,并在结构和磁学上进行了表征。在这些同构的CP中,八面体配位的金属离子通过单一的抗羧酸盐合成桥(μ-COO)连接在一起,形成线性三核基序。这些基元通过另一个单一的顺式-抗羧酸盐桥(μ-COO)连接在一起,形成2D(4,4)层,并且这些层通过L配体相互连接成3D框架。磁测量表明,金属离子之间的反铁磁相互作用是通过1和2中的单个顺式-反羧酸盐桥介导的,而3个中相同的羧酸盐桥传递铁磁耦合。由于Co(II)和Ni(II)离子的竞争作用,双金属CP 4显示出有趣的复杂磁行为。

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