Synthesis, structures, electrochemistry and magnetic properties of a cyano-bridged {Fe<sub>2sub>Co<sub>2sub>} molecular square
- 作者：Da-Peng Dong ; Jin-Qiu Xiao ; Peng-Fei Zhuang ; Hui Zheng ; Liang Zhao ; Cheng He ; Tao Liu<sup> ; sup><sup>liutao@dlut.edu.cnsup> ; Chun-Ying Duan<sup> ; sup><sup>cyduan@dlut.edu.cnsup>
- 关键词：Cyanide ; Crystal structure ; Ferromagnetic coupling ; Electrochemistry
- 刊名：Inorganic Chemistry Communications
- 出版年：2012
- 期刊代码：39_13877003
- 类别：ch
- 出版时间：July, 2012
- 卷：21
- 期：Complete
- 页码：84-87
- 文件大小：587 K
摘要
The reaction of tricyanometallate precursor, (Bu<sub>4sub>N)[(Tp*)Fe(CN)<sub>3sub>] (Tp* = hydrotris(3,5-dimethylpyrazol-l-yl)borate) with Co(ClO<sub>4sub>)<sub>2sub>路6H<sub>2sub>O in the presence of the bidentate dpa (dpa = 2,2鈥?dipyridyl amine) ligand affords one novel cyano-bridged heterobimetallic {Fe<sub>2sub>Co<sub>2sub>} molecular square, [Fe<sup>IIIsup>(Tp*)(CN)<sub>3sub>]<sub>2sub>[Co<sup>IIsup>(dpa)<sub>2sub>]<sub>2sub>鈥?ClO<sub>4sub>鈥?H<sub>2sub>O鈥?CH<sub>3sub>OH (<strong class="boldFont">1strong>). The molecular structure was determined by single-crystal X-ray diffraction. In compound <strong class="boldFont">1strong>, Fe<sup>IIIsup> ion is coordinated by three cyanide carbon atoms and three nitrogen atoms of Tp* anions. Whereas, the Co<sup>IIsup> ion is surrounded by two cyanide nitrogen atoms and four nitrogen atoms from two bidentate dpa ligands. Cyclic voltammetry (CV) measurements showed that complex <strong class="boldFont">1strong> exhibited one quasi-reversible waves (0.1 V vs SCE) in the reduction process, and irreversible waves in the oxidation process. Magnetic measurements indicate that complex <strong class="boldFont">1strong> exhibits a strong intramolecular ferromagnetic interaction between the low-spin Fe<sup>IIIsup>(S = 1/2) and high-spin Co<sup>IIsup>(S = 3/2) ions.