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Mononuclear High‐spin Octahedral Cobalt(II) Complex with Positive Axial Magnetic Anisotropy: Synthesis, Crystal Structure, and DFT Studies
Zeitschrift für anorganische und allgemeine Chemie ( IF 1.1 ) Pub Date : 2020-06-09 , DOI: 10.1002/zaac.202000154
Mohd Muddassir 1 , Abdullah Alarifi 1 , Mohd Afzal 1 , Ahmad Alowais 1 , Naaser A. Y. Abduh 1
Affiliation  

This article outlines the magnetic features of a new six–coordinate high‐spin cobalt(II) complex cis‐[CoII(tmphen)2(NCS)2] (1) achieved via the reactions of cobalt(II) thiocyanate with 3,4,7,8‐tetramethyl‐1,10‐phenanthroline. The complex 1 was thoroughly characterized by different analytical and spectroscopic techniques and further confirmed by single X‐ray crystal diffraction pattern. Complex 1 is a neutral molecule and adopt highly distorted six‐coordinate CoN6 octahedral coordination sphere surrounded by two thiocyanate N atoms in cis locations and the equatorial plane is occupied by two imine N atoms from the two tmphen ligand while the remaining two imine N atoms reside in the axial positions. Magnetic susceptibility data of complex 1 revealed that the χΜT values decrease significantly to a value of 1.49 cm3·K·mol–1 at 2.0 K on decreasing temperatures below 100 K, mainly ascribed to the significant spin–orbit coupling (SOC) of six‐coordinate CoII ions. Furthermore, a field‐dependence measurement was performed at 2 K, which shows a positive curvature up to 27 kOe, while it becomes linear up to 2.01 B, which authenticated the fact that only the lowest Kramers doublet of ground state is appreciably populated.

中文翻译:

具有正轴向磁各向异性的单核高自旋八面体钴(II)配合物:合成,晶体结构和DFT研究

本文概述了新的六配位高自旋钴(II)配合物[[Co II(tmphen)2(NCS)2 ](1)的磁性特征,该反应通过硫氰酸钴(II)与3, 4,7,8-四甲基-1,10-菲咯啉。复合物1通过不同的分析和光谱技术进行了彻底表征,并通过单X射线晶体衍射图进一步证实。配合物1是中性分子,采用高度扭曲的六配位CoN 6八面体配位球,在顺式中被两个硫氰酸盐N原子包围位置和赤道面被来自两个tmphen配体的两个亚胺N原子占据,而其余两个亚胺N原子位于轴向位置。的复杂的磁化率数据1显示,该χ Μ Ť值显著降低到1.49厘米的值3 · ķ ·摩尔-1,在递减的温度低于100 K时2.0 K,主要归因于显著自旋轨道耦合(SOC)六坐标的Co II离子。此外,字段依赖性测定在2 K,其示出了正曲率高达27千奥斯特执行,而它变为线性高达2.01 ,这证明了只有最低的基态克雷默斯二重峰可被填充的事实。
更新日期:2020-06-09
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