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

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research 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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.