Trapped in a Complex: the 1,2,4,5‐Tetrakis(tetramethylguanidino)benzene Radical Cation (ttmgb+·) with a Bisallylic Structure
Trapped in a Complex: the 1,2,4,5‐Tetrakis(tetramethylguanidino)benzene Radical Cation (ttmgb+·) with a Bisallylic Structure
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被困在复合物中：具有双烯丙基结构的 1,2,4,5-四（四甲基胍）苯自由基阳离子 (ttmgb+·)
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Hans‐Jörg Himmel
中科院分区：
文献类型：
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作者：
Christine Trumm;O. Hübner;E. Kaifer;Hans‐Jörg Himmel
在这项工作中，我们跟踪强电子给体1，2，4，5-四（四甲基胍基）苯（ttmgb）与Cu II硝酸盐的反应。三个双核铜II配合物被分离为该反应的产物。根据反应条件，特别是两种反应物的摩尔比，这些配合物中的TTMGB配体是中性的，单或双阳离子的。所有三个配合物的结构特征。除了实验研究外，还进行了量子化学计算，结合实验磁性（SQUID）曲线，特别是揭示了磁超交换。双核铜II配合物的ttmgb自由基阳离子代表一个三自旋系统。SQUID磁性数据以及量子化学计算的结果表明，强铁磁性铜配体耦合。
In this work we follow the reaction of the strong electron donor 1,2,4,5-tetrakis(tetramethylguanidino)benzene (ttmgb) with Cu II nitrate. Three binuclear Cu II complexes were isolated as products of this reaction. Depending on the reaction conditions, especially the molar ratio of the two reactants, the ttmgb ligand in these complexes is neutral, mono- or dicationic. All three complexes were structurally characterized. In addition to the experimental studies, quantum chemical calculations were carried out, which, in combination with experimental magnetic (SQUID) curves, especially shed light on the magnetic superexchange. The binuclear Cu II complex of the ttmgb radical cation represents a three-spin system. The SQUID magnetic data as well as the results of quantum chemical calculations indicate strong ferromagnetic copper-ligand coupling.