Synthesis, spectral and ferromagnetic interactions in isophthalato bridged binuclear copper(II) complexes

IF 1.7 4区化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR Transition Metal Chemistry Pub Date : 1997-05-01 DOI:10.1007/BF03651764

Yan-Tuan Li, Cui-Wei Yan, Dai-Zheng Liao

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引用次数: 0

Abstract

Four novel copper(II) binuclear complexes have been synthesized and characterized, namely [Cu₂(IPHTA)( L)₂](ClO₄)₂ (L denotes 2,2′-bipyridine (bpy); 1,10- phenanthroline (phen); 4,4′-dimethyl-2,2′-bipyridine (Me₂bpy) and 5-nitro-1,10-phenanthroline (NO₂-phen); where IPHTA is the isophthalate dianion. Based on the elemental analyses, molar conductance measurements and spectroscopic studies, extended IPHTA-bridged structures consisting of two copper(II) ions, each in a square planar environment, are proposed for these complexes. The [Cu₂(IPHTA)(bpy)₂](ClO₄)₂ (1) and [Cu₂(IPHTA)(phen)₂](ClO₄)₂ (2) complexes were characterized by variable temperature magnetic susceptibility measurements (4–300 K) and the observed data were successfully simulated by the equation based on the spin Hamiltonian operator, Ĥ = −2JŜ₁Ŝ₂, giving the exchange integral J = 8.96 cm⁻¹ for (1) and J = 9.88 cm⁻¹ for (2). This result indicates the presence of a weak ferromagnetic spin-exchange interaction between the metal ions.

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异酞桥双核铜(II)配合物的合成、光谱和铁磁相互作用

合成并表征了四种新型铜（II）双核配合物，即 [Cu2(IPHTA)(L)2](ClO4)2（L 表示 2,2′-联吡啶 (bpy)；1,10-菲罗啉（phen）；4,4′-二甲基-2,2′-联吡啶（Me2bpy）和 5-硝基-1,10-菲罗啉（NO2-phen）；其中 IPHTA 是邻苯二甲酸二元异构体。根据元素分析、摩尔电导测量和光谱研究，提出了这些配合物的扩展 IPHTA 桥接结构，该结构由两个铜(II)离子组成，每个铜(II)离子都处于方形平面环境中。通过变温磁感应强度测量（4-300 K）对 [Cu2(IPHTA)(bpy)2](ClO4)2 (1) 和 [Cu2(IPHTA)(phen)2](ClO4)2 (2) 复合物进行了表征，并用基于自旋哈密顿算子的方程Ĥ = -2JŜ1Ŝ2 成功地模拟了观察到的数据，得出交换积分 J = 8.96 cm-1，(2) 的交换积分为 J = 9.88 cm-1。这一结果表明金属离子之间存在微弱的铁磁自旋交换相互作用。

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来源期刊

Transition Metal Chemistry 化学-无机化学与核化学

CiteScore

3.60

自引率

0.00%

发文量

审稿时长

1.3 months

期刊介绍： Transition Metal Chemistry is an international journal designed to deal with all aspects of the subject embodied in the title: the preparation of transition metal-based molecular compounds of all kinds (including complexes of the Group 12 elements), their structural, physical, kinetic, catalytic and biological properties, their use in chemical synthesis as well as their application in the widest context, their role in naturally occurring systems etc. Manuscripts submitted to the journal should be of broad appeal to the readership and for this reason, papers which are confined to more specialised studies such as the measurement of solution phase equilibria or thermal decomposition studies, or papers which include extensive material on f-block elements, or papers dealing with non-molecular materials, will not normally be considered for publication. Work describing new ligands or coordination geometries must provide sufficient evidence for the confident assignment of structural formulae; this will usually take the form of one or more X-ray crystal structures.