Coordination of gadolinium(III) ions with a preformed mu-oxo diiron(III) complex:structural and magnetic data

Jean-Pierre Costes; Francoise Dashan; Frederic Dumestre; Juan Modesto Clemente-Juan

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Coordination of gadolinium(III) ions with a preformed mu-oxo diiron(III) complex:structural and magnetic data

机译：ado（III）离子与预先形成的mu-oxo diiron（III）配合物的配位：结构和磁性数据

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A hexadentate ligand LH_2 (LH_2 = 1,2-bis((3-methoxysalicylidene)amino)ethane) reacts with iron(III) ions to yield a u-oxo complex (LFe)_20,1,which may function as a ligand towards gadolinium(III).The resulting product is a tetranuclear complex [LFeGd(NO_3)_3]_2O,2.Its structure has been determined by single crystal X-ray crystallography:2,monoclinic P_2 (No.14),a=15.346(2),b=17.372(2),c=19.625(2) A,beta=100.59(1)~°,Z=4.The thermal dependence of the xMT product (X_M=molar magnetic susceptibility) and the field dependence of the magnetization (A/) have been measured and analyzed according to the spin cluster model.In both complexes the Fe-Fe interaction is antiferromagnetic with a magnitude of-115.3 cm~(-1)(1) and -101.4 cm~(-1) (2).In the latter compound an exchange coupling is operative within each (Fem,Gdra) pair.Modelling of the experimental data (xMT and M) leads to the conclusion that this interaction is small and,unexpectedly,antiferromagnetic.

机译：六齿配体LH_2（LH_2 = 1,2-双（（3-甲氧基水杨基）氨基）乙烷）与铁（III）离子反应生成u-氧代络合物（LFe）_20,1，可作为The（III）。生成的产物是四核络合物[LFeGd（NO_3）_3] _2O，2。其结构已通过单晶X射线晶体学测定：2，单斜晶P_2 / n（No.14），a = 15.346（2），b = 17.372（2），c = 19.625（2）A，beta = 100.59（1）〜°，Z = 4.xMT乘积（X_M =摩尔磁化率）与磁场的热依赖性根据自旋簇模型测量和分析了磁化强度（A /）的依赖性。在两种配合物中，Fe-Fe相互作用都是反铁磁性的，幅度为-115.3 cm〜（-1）（1）和-101.4 cm〜。（-1）（2）。在后一种化合物中，每个（Fem，Gdra）对之间都存在交换耦合。对实验数据（xMT和M）进行建模得出的结论是，这种相互作用很小，而且反正反磁。

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《Dalton transactions: An international journal of inorganic chemistry》 |2003年第3期|共5页
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Jean-Pierre Costes; Francoise Dashan; Frederic Dumestre; Juan Modesto Clemente-Juan;
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1. Coordination of gadolinium(III) ions with a preformed mu-oxo diiron(III) complex:structural and magnetic data [J] . Jean-Pierre Costes, Francoise Dashan, Frederic Dumestre, Dalton transactions: An international journal of inorganic chemistry . 2003,第3期

机译：ado（III）离子与预先形成的mu-oxo diiron（III）配合物的配位：结构和磁性数据
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Coordination of gadolinium(III) ions with a preformed mu-oxo diiron(III) complex:structural and magnetic data

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