Abstract
The organic ligand (1-methyl-1H-benzo[d]imidazol-2-yl)methanol (HL) was used to react with CoX2·6H2O (X = Cl and Br) under solvothermal conditions to obtain the complex [Co4(L)6(X)2] (1, X = Cl; 2, X = Br). The butterfly-shaped structure of complex 1 and 2 suggest that Co(II) ions have two different coordinated modes, which are five coordination with O3NX environment and six coordination with O4N2 environment. In addition, the electrospray ionization mass spectrometry (ESI-MS) analysis indicated that the ion molecular fragment of highest intensity was [Co4(L)6]2+, and there existed a high nuclear fragment peak of [Co7(L)12]2+. Interestingly, it was basically completely transformed into [Co7(L)12]2+ two days later, so those two complexes were relatively stable in CH3OH. Magnetic characterization exhibited that complex 1 and 2 display field-induced single-molecule magnetic behavior, of which the energy hills Ueff/kB were 28 and 20 K under direct-current field of 0.1 T, respectively.
Highlights
Since the find of “single-molecule magnets” (SMMs), the design and synthesis of magnetic material clusters have attracted wide attention in recent decades [1,2,3,4,5,6,7]
Electrospray ionization mass spectrometry (ESI-MS) data show that they organic ligand molecules
The results demonstrated that the fewer fragment peaks assembled by the ESI-MS ionization procedure may experience outspread assembly procedures, resulting in diversely high nuclear peaks
Summary
Since the find of “single-molecule magnets” (SMMs), the design and synthesis of magnetic material clusters have attracted wide attention in recent decades [1,2,3,4,5,6,7]. Synthesizing molecular structures with SMM behavior poses a serious defiance due to the hardships in assembling divinable magnetic characterizations of predetermined structures [9]. It is a big challenge to synthesize SMMs of cobalt with low symmetry and in particular displaying large spin and magnetic aeolotropism [18]. For complexes 1 and 2, every five-coordinative Co(II) core is encompassed by two μ2 -O− , one μ3 -O− ions and one N atom from the three organic ligand molecules, and one X− ion, and every six-coordinative Co(II) is coordinated by two μ2 -O− , two μ3 -O− ions, and two N atoms from the four. Electrospray ionization mass spectrometry data show that they are organic ligand molecules. Electrospray ionization mass spectrometry (ESI-MS) data show that they organic ligand molecules.
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