Synthesis, Characterization, and Magnetic Properties of Copper(II)-Lanthanide(III) Heterobinuclear Complexes Bridged by N,N'-Oxamidobis(3,5-dibromobenzoato)cuprate(II)

Yan-Tuan Li; Cui-Wei Yan; Jie Zhang

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Synthesis, Characterization, and Magnetic Properties of Copper(II)-Lanthanide(III) Heterobinuclear Complexes Bridged by N,N'-Oxamidobis(3,5-dibromobenzoato)cuprate(II)

机译：N，N'-氧杂双（3,5-二溴苯并）（II）桥联的铜（II）-镧系元素（III）杂双核配合物的合成，表征和磁性

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Twelve new copper(II)-lanthanide(III) heterobinuclear complexes bridged by N,N'-oxamidobis(3,5-dibromobenzoato)cuprate(II) [Cu(Br_4obbz)]~(2-) and end-capped with 4,4'-dimethyl-2,2'-bipyridine (Me_2bpy), namely, Cu(Br_4obbz)Ln(Me_2bpy)_2NO_3 (Ln = Y, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb), have been synthesized and characterized by elemental analyses, molar conductivity measurements, and spectroscopic (IR, UV, ESR) studies. The temperature dependence of the magnetic susceptibility of the Cu(Br_4obbz)Gd(Me_2bpy)_2NO_3 complex was further measured over the range 4.2-300 K. The least-squares fit of the experimental susceptibilities based on the spin Hamiltonian operator, H-circumflex = -2J(S-circumflex)_1·(S-circumflex)_2, yielded J = +2.75 cm~(-1). This result indicates the presence of a weak ferromagnetic spin-exchange interaction between Gd(III) and Cu(II) ions. A plausible mechanism for the ferromagnetic coupling between Gd(III) and Cu(II) is discussed in terms of spin polarization.

机译：十二个新的铜（II）-镧系元素（III）异双核络合物，由N，N'-乙酰胺二（3,5-二溴苯并）（II）[Cu（Br_4obbz）]〜（2-）桥接，并被4封端4'-二甲基-2,2'-联吡啶（Me_2bpy），即Cu（Br_4obbz）Ln（Me_2bpy）_2NO_3（Ln = Y，La，Pr，Nd，Sm，Eu，Gd，Tb，Dy，Ho，Er （Yb）合成，并通过元素分析，摩尔电导率测量和光谱学（IR，UV，ESR）研究来表征。在4.2-300 K的范围内，进一步测量了Cu（Br_4obbz）Gd（Me_2bpy）_2NO_3配合物的磁化率与温度的关系。基于自旋哈密顿算子H-circumflex = -2J（S-circumflex）_1·（S-circumflex）_2，产生J = +2.75 cm〜（-1）。该结果表明Gd（III）和Cu（II）离子之间存在弱的铁磁自旋交换相互作用。从自旋极化的角度讨论了Gd（III）和Cu（II）之间铁磁耦合的合理机制。

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《Crystal growth & design》 |2003年第4期|共5页
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Yan-Tuan Li; Cui-Wei Yan; Jie Zhang;
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Synthesis, Characterization, and Magnetic Properties of Copper(II)-Lanthanide(III) Heterobinuclear Complexes Bridged by N,N'-Oxamidobis(3,5-dibromobenzoato)cuprate(II)

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