Citation: WANG Hui-Sheng, PAN Zhi-Quan. Synthesis, Crystal Structure and Magneto-Structural Correlation of a [Mn8Ce] Cluster Substituted by Four Pyrazoles[J]. Chinese Journal of Inorganic Chemistry, ;2014, 30(5): 1104-1110. doi: 10.11862/CJIC.2014.188
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One [Mn8Ce] mixed metal cluster, namely, [Mn8O8Ce(O2CCH3)12(pyr)4]·2CH3OH (2·2CH3OH, pyr=pyrozole) has been obtained by adding (NH4)2Ce(NO3)6 to the acetonitrile/methanol solution containing Mn(O2CCH3)2·4H2O, pyrozole and acetic acid. The complex was fully characterized by X-ray single crystal structural diffraction, IR, elemental analysis and magnetic investigation. The structural analysis indicates that the complex crystallized in the monoclinic system, P21/c space group, and the eight MnⅢ ions formed a nonplanar loop, which was further attached to the central CeⅣ ion via eight μ3-O2- ions. Magnetic studies indicate that, within the cluster, the magnetic coupling interactions between Mn3+ ions are weak ferromagnetic, with the ground state Sbeing 6. Moreover, there are only very weak frequency-dependent signals from ac magnetic susceptibility investigations. By analyzing magneto-structural correlation of a series of [Mn8Ce] complexes, we found that with the angles at monoatomically bridging O2- increasing and with the angle at monoatomically bridging carboxylate Odecreasing, the ferromagnetic interactions between Mn atoms will be strengthened, which further lead to larger S.
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