We present a series of six new tridentate Schiff base-like ligands, derived from 2-picolylamine, providing an NNO coordination sphere. Their corresponding Cu(II) complexes were synthesised with a range of varying counter anions (OAc⁻, NO₃⁻, Cl⁻, I⁻, NCS⁻, and N₃⁻). The results from single X-ray structure analyses of four ligands and 22 Cu(II) complexes are presented. The majority of the complexes crystallised as dimers with the anion bridging the Cu(II) centres in a μ-fashion; depending on the substituents at the ligand and the counter ion the formation of coordination polymers or mononuclear complexes is also possible. Temperature dependent magnetic measurements revealed that the exchange interactions between the Cu(II) centres depend on the nature of the bridging ligand (axial/equatorial), the Cu–X–Cu angle, and the distortion between a square pyramidal and a trigonal bipyramidal coordination sphere, explicable by assuming a superexchange.

中文翻译：

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具有NNO-席夫碱样配体的 新型Cu（ii）配合物-结构和磁性†

我们提出了一系列的六个新的三齿Schiff碱样配体，它们来自2- picolylamine，提供了一个NNO配位域。它们相应的Cu（II）复合物用的范围内变化的抗衡阴离子的合成（OAC ^-，NO ₃ ^- ，氯^- ，我^-，NCS ^-和N ₃ ^- ）。给出了来自四个配体和22 Cu（II）配合物的X射线结构分析的结果。多数配合物结晶为二聚体，阴离子桥连Cu（II）以μ时尚为中心；取决于配体上的取代基和抗衡离子，配位聚合物或单核络合物的形成也是可能的。随温度变化的磁测量结果表明，Cu（II）中心之间的交换相互作用取决于桥联配体的性质（轴向/赤道），Cu–X–Cu角以及正方形金字塔形和三角形双锥体配位之间的畸变球形，可通过假设超级交换来解释。