高等学校化学学报

高等学校化学学报 ›› 1991, Vol. 12 ›› Issue (4): 427.

• 论文 •    下一篇

双核Ni(Ⅱ)氯醌酸阴离子桥联配合物的合成和磁性

郝松琪, 姜宗慧, 廖代正, 张智勇, 王耕霖   

  1. 南开大学化学系, 300071
  • 收稿日期:1989-07-26 出版日期:1991-04-24 发布日期:1991-04-24
  • 通讯作者: 王耕霖
  • 基金资助:

    国家自然科学基金

Synthesis and Magnetism of Binuclear Nickel (Ⅱ) Complexes Using the Dianions of Chloranilic Acids as Bridging Ligands

Hao Song-qi, Jiang Zong-hui, Liao Dai-zheng, Zhang Zhi-yong, Wang Geng-lin   

  1. Department of Chemistry, Nankai University, Tianjin, 300071
  • Received:1989-07-26 Online:1991-04-24 Published:1991-04-24

PDF (PC)

被引次数

11

摘要： 合成了4种以氯醌酸阴离子为桥联配体的Ni(Ⅱ)单核和双核配合物,经元素分析、IR、电子光谱、磁化率测定进行了表征。发现其μeff值随温度降低先出现极大,后又复变小。在考虑到分子间相互作用和单离子零场分裂影响等因素后,用修正的Heisenberg模型进行处理,结果表明分子内Ni(Ⅱ)离子间存在铁磁性磁交换作用,而分子间则为反铁磁性磁交换作用。

关键词: 双核配合物, Ni(Ⅱ)-Ni(Ⅱ), 磁性

Abstract: Four new nicke(Ⅱ) complexes containing the dianions of chloranilic acids(CA) which act as the bridging ligand in these complexes were synthesized, namely [Ni(phen)2CA]3·H2O(1; phen=o-phenanthroline), [Ni2(phen)4CA](ClO4)2·2H2O(2), [Ni(bpy)2CA]·H2O(3; bpy=2,2'-bipyridyl) and [Ni2(bpy)4CA](ClO4)2·2H2O(4). They have been characterized by elemental analyses, IR, electronic spectra, ESR, susceptibility and variable-temperature magnetic susceptibility. Ni (Ⅱ) might display distorted octahedral coordination in the complexes. The variable-temperature magnetic susceptibilities of (2) and (4) were measured (4-300K). Based on the fact that as the temperature is lowered,μell, gradually increases until a maximum is reached and then decreased, considering the combined effects of single-ion zero-field splitting(D) and interdimer interaction(Z'J'), the observed data were fitted to those from a modified Heisenberg model. The obtained parameters: J=100. 34, Z'J'=- 0. 382 for the complex(2); J=69. 66, Z'J'=- 0. 382 for the complex(4). The results indicate that there is a ferromagnetic intracluster interaction (positive J) and antiferromagnetic interdimer interaction (negative Z'J')

Key words: Binuclear complex, Dinickel(Ⅱ), Magnetism

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