Through ppm level control over the degree of hydration (e.g., 300 ppm vs. 10 000 ppm), the nuclearity and topology of cobalt complexes can be tailored, as demonstrated here. This was achieved by employing N-imidoylamidine ligands, which possess both bidentate and tridentate coordination sites, affording mono-, tri- and hexanuclear cobalt complexes. Structural characterization and magnetic analysis were used to elucidate the spin state of the cobalt ions, which reveal a unique combination of low and high spin states within the polynuclear systems.

中文翻译：

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通过ppm级水合控制钴配合物的核化和拓扑结构

通过控制水合度的ppm水平（例如300 ppm对10000 ppm），可以调整钴配合物的核化和拓扑结构，如此处所示。这是通过使用具有二齿和三齿配位位点的N-亚氨基嘧啶配体实现的，提供了单，三和六核钴配合物。使用结构表征和磁性分析来阐明钴离子的自旋态，这揭示了多核系统中低和高自旋态的独特组合。