| 含氢键吡啶合钴(Ⅱ)配合物的晶体结构和磁交换作用 |
| CRYSTAL STRUCTURE AND MAGNETIC EXCHANGE INTERACTION STUDY ON HYDROGEN BONDS CONTAINING PYRIDINE Co(Ⅱ) COMPLEX |
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| 摘要: 合成了含水配合物［Co(py)4Cl2］·H2O。分析了其单晶结构并与已知的无水配合物Co(py)4Cl2作了比较。发现结晶水的存在使含水配合物晶胞及分子对称性下降，由4方晶系I41/acd空间群变为单斜晶系P21/n空间群。并且水分子通过氢键作用把［Co(py)4Cl2］联接成一维长链。用Curie-Weiss定律，零场分裂磁化率公式加分子场校正磁化率公式拟合变温磁化率数据，发现分子间存在弱的反铁磁性交换作用。用Fisher一维线性链模型磁化率公式拟合，得出其氢键链内交换常数约为-1.03K。 |
| 关键词: 磁交换作用 反铁磁性 钴 |
| 基金项目: |
| Abstract: Hydrous complex of ［Co(py)4Cl2］·H2O was synthesized. Its crystal and molecular structure were determined and compared with the anhydrous complex ［Co(py)4Cl2］. Through comparation we obtained the information that the presence of the water molecule has lowered the symmetry of the unit cell as well as the molecule. The space group of the crystal changes from tetragonal I41/acd to monoclinic P21/n. The water molecule was enbedded between two adjacent complex molecules and serves as a hydrogen-bonded bridge Co-Cl-O-Cl-Co which connects the Co2+ into one dimensional chain. The variable-temperature magnetic susceptibility data was fitted with Curie-Weiss law and Zero Field Splitting formula. In addition, the molecular field correction was added to modify the result. It showed that there is a weak antiferromagnetic interaction between complex molecules. This magnetic exchange interaction may be propagated by the hydrogen-bonded pathway or the dipole-dipole interaction. We also used the Fisher′s one dimensional chain model formula to fit the data. The intra hdyrogen-bond chain exchange constant is about -1.03K. |
| Keywords: magnetic exchange interaction antiferromagnetism cobalt |
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| 摘要点击次数: 1928 |
| 全文下载次数: 1712 |
| 王谷丰,季峰,朱小蕾,王国雄,郁开北.含氢键吡啶合钴(Ⅱ)配合物的晶体结构和磁交换作用[J].无机化学学报,1999,15(4):435-440. |
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