手性[MnLn]纳米簇模型的Schiff 碱衍生物：合成、晶体结构和磁性。
Nanosized Chiral [MnLn] Clusters Modeled by Enantiomeric Schiff Base Derivatives: Synthesis, Crystal Structures, and Magnetic Properties.
机构信息
Key Laboratory of Material Chemistry for Energy Conversion and Storage, School of Chemistry and Chemical Engineering , Huazhong University of Science and Technology , Wuhan , Hubei 430074 , People's Republic of China.
Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, School of Chemical and Environmental Engineering , Jianghan University , Wuhan , Hubei 430056 , People's Republic of China.
出版信息
Inorg Chem. 2018 Jul 16;57(14):8639-8645. doi: 10.1021/acs.inorgchem.8b01423. Epub 2018 Jul 2.
Two enantiomeric pairs of new 3d-4f heterometallic clusters have been built from two enantiomer Schiff base derivatives, labeled as R-/ S-HL, in situ obtained from the condensation reactions with o-vanillin and R-/ S-2-phenylglycinol. The formulas of the series clusters are [MnLn(μ-OH)(μ-O)(Ac)(HO)( R-L)]·NO·OH (Ln = Dy (1R), Gd (2R)), [MnLn(μ-OH)(μ-O)(Ac)(HO)( S-L)]·NO·OH (Ln = Dy (1S), Gd (2S)), whose crystal structures and magnetic properties have been characterized. Structural analysis indicated that the above clusters consisted of a [MnLn] core, featuring a sandwich configuration. The results of magnetic measurements showed the presence of slow magnetic relaxation with the effective energy barrier of 14.85 K in two Dy derivatives under the condition of zero-dc field, while the significant magnetocaloric effect of Gd analogues was found in a wide temperature range.
已从两个对映体希夫碱衍生物 R-/ S-HL 原位构建了两对新的 3d-4f 杂金属簇，这些衍生物是通过 o-香草醛和 R-/ S-2-苯甘氨酸的缩合反应获得的。该系列簇的化学式为 [MnLn(μ-OH)(μ-O)(Ac)(HO)( R-L)]·NO·OH（Ln = Dy（1R），Gd（2R）），[MnLn(μ-OH)(μ-O)(Ac)(HO)( S-L)]·NO·OH（Ln = Dy（1S），Gd（2S）），其晶体结构和磁性已得到表征。结构分析表明，上述簇由[MnLn]核组成，具有三明治构型。磁测量结果表明，在零直流场条件下，两个 Dy 衍生物中存在缓慢的磁弛豫，有效能垒为 14.85 K，而 Gd 类似物在很宽的温度范围内表现出显著的磁热效应。
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