Family of dumbbell Ni4Ln2 (Ln = Pr, Sm, Eu, Gd, Tb, Ho, Er) complexes: syntheses, structures, luminescent and magnetic properties.
Family of dumbbell Ni4Ln2 (Ln = Pr, Sm, Eu, Gd, Tb, Ho, Er) complexes: syntheses, structures, luminescent and magnetic properties.
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DOI：
10.1039/c3dt32935f
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发表时间：
2013-03
影响因子：
4
通讯作者：
Baolin Liu;Qing-Xia Liu;Hongping Xiao;Wu Zhang;Ruojie Tao
中科院分区：
文献类型：
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作者：
Baolin Liu;Qing-Xia Liu;Hongping Xiao;Wu Zhang;Ruojie Tao
一类异金属Ni_4Ln_2配合物的合成与表征（Ln = Pr（1），Sm（2），Eu（3），Gd（4），Tb（5），Ho（6）和Er（7）），式为[Ni 2LnL 1 L2（OH）（H2O）]2，其中H4 L1为3，3 ′-（1 E，1′E）-（2，2 ′-（2-氨基乙基氮烷二基）双（乙烷-2，1-二基）双（氮烷-1-基-1-亚基））双（甲烷-1-基-1-亚基）双（2-羟基苯甲酸），H2 L2是3-甲酰基-2-羟基苯甲酸。用单晶X-射线衍射法测定了1-7的分子结构，表明它们是同构的。在所有这些化合物中，六种金属离子结合在一起形成一个新的Ni 4Ln 2 O 10核心，并表现出相对罕见的哑铃型结构。在这些化合物中，Ni离子处于轻微扭曲的四方锥或八面体环境中。一个全氧配位环境（8 O）是存在于周围的中心镧系元素离子，这是存在于一个扭曲的正方形反棱柱几何。1-7中的Ln-Ln和Ln-Oavg键距显示出从1到7的逐渐减小，与镧系收缩一致。研究了所有化合物的发光性质。磁化率分析表明，反铁磁相互作用的复杂4。
The synthesis and characterization of a family of heterometallic Ni4Ln2 complexes (Ln = Pr(1), Sm(2), Eu(3), Gd(4), Tb(5), Ho(6) and Er(7)) of the formula [Ni2LnL1L2(OH)(H2O)]2 are reported, where H4L1 is 3,3′-(1E,1′E)-(2,2′-(2-aminoethylazanediyl)bis(ethane-2,1-diyl)bis(azan-1-yl-1-ylidene))bis(methan-1-yl-1-ylidene)bis(2-hydroxybenzoic acid) and H2L2 is 3-formyl-2-hydroxybenzoic acid. The molecular structures of 1–7 were determined by single-crystal X-ray diffraction and reveal that they are isostructural. In all of these compounds, the six metal ions are held together to form a novel Ni4Ln2O10 core and exhibit a relatively rare dumbbell-type structure. In these compounds, the Ni ions are in slightly distorted square-pyramidal or octahedral environments. An all-oxygen coordination environment (8O) is present around the central lanthanide ion, which is present in a distorted square antiprismatic geometry. The Ln–Ln and Ln–Oavg bond distances in 1–7 show a gradual reduction proceeding from 1 to 7, in accordance with the lanthanide contraction. The luminescent properties of all the compounds have been studied. The magnetic susceptibility analysis demonstrate antiferromagnetic interactions within complex 4.