五角双锥构型的场诱导Co^(Ⅱ)单离子磁体  

Field-induced Co^(Ⅱ) single-ion magnet with pentagonal bipyramidal configuration

作　　者：赵淑艳[1] ZHAO Shuyan(Chengde Nursing Vocational College,Chengde,Hebei 067000,China)

机构地区：[1]承德护理职业学院,承德067000

出　　处：《无机化学学报》2024年第8期1583-1591,共9页Chinese Journal of Inorganic Chemistry

摘　　要：利用CoCl_(2)·6H_(2)O和2,6-二乙酰吡啶双(氨基脲)(H_(2)dapsc)在水和乙醇的混合溶剂中回流反应得到一例具有五角双锥构型的单核Co~Ⅱ配合物[Co(H_(2)dapsc)(H_(2)O)Cl]Cl·2H_(2)O(1),其中中性的H_(2)dapsc配体分子提供5个配位原子构成其赤道平面,1个水分子和1个Cl^(-)离子则占据其轴向位置,同时在其固态结构中包含1个价态平衡Cl^(-)离子和晶格水分子。直流磁化率研究表明,该配合物具有强的磁各向异性;交流磁性质表明其存在慢磁弛豫行为,直接和拉曼过程同时主导其弛豫,自旋翻转能垒为55.55 K。结合理论计算可以得出,导致该配合物慢磁弛豫行为的主要原因是五角双锥结构的面内各向异性,计算得到的D、E值为45.68、-0.32 cm^(-1)。A mononuclear Co^(Ⅱ)complex,[Co(H_(2)dapsc)(H_(2)O)Cl]Cl·2H_(2)O(1),with a pentagonal bipyramidal configuration was obtained by reflux reaction of CoCl_(2)·6H_(2)O and 2,6-diacetylpyridine-bis(semicarbazone)(H_(2)dapsc)in a mixed solvent of water and ethanol.The neutral ligand H_(2)dapsc molecule provides five coordination atoms to form the equatorial plane of 1,while a water molecule and a Cl^(-)ion occupy their axial positions.At the same time,the solid structure contains a valence counteranion Cl^(-)ion and two lattice water molecules.The study of DC magnetic susceptibility indicates that complex 1 has strong magnetic anisotropy.The AC magnetic properties show the existence of slow magnetic relaxation behavior,which is dominated by both direct and Raman processes.The energy barrier for magnetization reversal was 55.55 K.Based on theoretical calculations,it can be concluded that the main reason for the slow magnetic relaxation behavior is the rhombic anisotropy of the pentagonal bipyramidal structure.The calculated D and E values were 45.68 and-0.32 cm^(-1).

关 键 词：Co^(Ⅱ)配合物 五角双锥 晶体结构 磁性质 

分 类 号：O614.812[理学—无机化学]