In this work, using a bulky anion, a mononuclear five-coordinate Co(II) complex [Co(12-TMC)(CH₃CN)][B(C₆F₅)₄]₂·CH₂Cl₂ (12-TMC ​= ​1,4,7,10-tetramethyl-1,4,7,10-tetraazacyclododecane) (1) has been constructed. X-ray single crystal diffraction shows that the central Co(II) ion of 1 binds with five N atoms, generating a distorted square pyramidal geometry. The direct-current (dc) magnetic data of 1 displayed a gradual and incomplete spin-crossover behaviour. Compared with reported complexes [Co(12-TMC)(CH₃CN)](X)₂ (X ​= ​BF₄⁻, 2; and PF₆⁻, 3), complex 1 exhibited much slower magnetic relaxation under an applied dc field of 1000 ​Oe, which originated from the low-spin state (S ​= ​1/2) of Co(II) ion.

在这项工作中，使用大体积阴离子，单核五配位Co（II）配合物[Co（12-TMC）（CH ₃ CN）] [B（C ₆ F ₅）₄ ] ₂ ·CH ₂ Cl ₂（12 -TMC = 1,4,7,10-四甲基-1,4,7,10-四氮杂环十二烷）（1）已构建。X射线单晶衍射表明，该CO中心（II）离子的1个结合有五个N原子，生成变形四方锥几何形状。直流（DC）的磁数据1显示一个渐进的和不完整的自旋交叉行为。与报道的配合物[Co（12-TMC）（CH ₃ CN）]（X）₂（X = BF₄ ⁻，2 ; 和PF ₆ ^- ，3），复杂1在1000奥斯特的施加的DC场，它源于低自旋态（显示出慢得多的磁弛豫小号 的Co（II）离子的= 1/2）。