Structure Types and Magnetic Behavior of Cobalt NanoclustersClick to copy article linkArticle link copied!
- Beiling LiaoBeiling LiaoSchool of Chemistry and Biological Engineering, Hechi University, Hechi 546300, People’s Republic of ChinaMore by Beiling Liao
- Shixiong Li*Shixiong Li*Email: [email protected] (S.X. Li)School of Chemistry and Biological Engineering, Hechi University, Hechi 546300, People’s Republic of ChinaSchool of Chemical Engineering and Resource Recycling, Wuzhou University, Wuzhou 543002, People’s Republic of ChinaMore by Shixiong Li
- Guoping Yang*Guoping Yang*Email: [email protected] (G.P. Yang)Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China University of Technology, Nanchang 330013, People’s Republic of ChinaMore by Guoping Yang
Abstract
Caprylic hydrazide ligands are ideal ligands for the synthesis of novel polynuclear metal complexes, because they contain many N,O coordination atoms with a strong coordination ability, abundant hydrogen-bond donors, acceptors, and large conjugation systems. Here, we successfully obtained one dodecanuclear cobalt nanocluster [CoII8CoIII4(L1)4(Py)12(CH3OH)4(CH3COO)4]·(CH3OH)13 (1) and one octadecanuclear cobalt nanocluster [CoII18(L2)6(Py)48]·(DMF)5·(CH3OH)8 (2) by using H6L1 and H6L2 ligands, respectively (Py = pyridine; DMF = dimethylformamide). The cyclic cobalt nanocluster 1 can be regarded as two pentanuclear cobalt units (Co5(N–N)4) connected by two cobalt ions, and it is a mixed-valent Co nanocluster. Every H6L1 ligand contains 10 coordination atoms, each of which coordinates with the Co ions. And every two H6L1 ligands form a structure similar to a handshake. The abnormal cylindrical cobalt nanocluster 2 can be regarded six trinuclear cobalt units Co3(N–N)2 connected by one L26– ligand, and every L26– ligand splits the structure on both sides, with a twisted cyclohexane in the middle. AC magnetic susceptibilities show that nanocluster 1 exhibits no frequency-dependent behavior, but nanocluster 2 shows an obviously single-molecule magnetic behavior, and the relaxation process of the energy barrier is 20.4 K.
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