稀土–钴单分子磁体的研究进展

稀土–过渡单分子磁体材料不仅磁性能优越,而且稀土和过渡金属具有良好的光、电、催化等性质,使其在高密度信息存储、量子计算以及多功能磁分子材料合成方面具有广阔的应用前景。钴离子具有较大的磁各向异性,是构筑单分子磁体的重要金属离子。因此,本文介绍了近年来典型的稀土–钴单分子磁体的研究进展。

铁–稀土单分子磁体的研究进展

在3d-4f单分子磁体(SMMs)中,铁通常以两种氧化态存在:FeII和FeIII。在八面体场中,低自旋FeII缺乏不成对电子,使其具有抗磁性,而高自旋FeII具有四个不成对电子,表现出顺磁性。另一方面,FeIII在配位环境中普遍表现出高自旋行为,比FeII更稳定,可以利用这些特性可以合成许多高性能的Fe-Ln SMMs。因此,本文通过对近年来典型的铁–稀土SMMs进行综述,以期为3d-4f SMMs的发展奠定一定的基础。In 3d-4f single molecule magnets (SMMs), iron is usually present in two oxidation states: FeII and FeIII. In the octahedral field, low spin FeII lacks unpaired electrons, making it diamagnetic, while high spin FeII has four unpaired electrons, showing paramagnetism. Moreover, FeIII generally exhibits high spin behavior in the coordination environment and is more stable than FeII, which can be used to synthesize many high-performance iron-lanthanide (Fe-Ln) SMMs. Therefore, this paper reviews the typical Fe-Ln SMMs in recent years, in order to lay a certain foundation for the development of 3d-4f SMMs.

锌–稀土单分子磁体的研究进展

锌(II) d轨道的电子是全充满的,它通过与配体形成配位键。在结构中提供金属骨架,并通过桥联配体与稀土元素连接,间接影响稀土离子的磁性行为。近年来,锌–稀土金属配合物在分子磁性材料领域受到广泛关注,因此,本文通过对近年来典型的锌–稀土单分子磁体进行综述,以期为3d-4f单分子磁体的发展奠定一定的基础。The electrons of the zinc(II) d orbital are fully filled, which can form coordination bonds with ligands. It provides a metal skeleton in the structure and is connected to lanthanide elements by bridging ligands, indirectly affecting the magnetic behavior of lanthanide ions. In recent years, zinc-lanthanide metal complexes have received extensive attention in the field of molecular magnetic materials. Therefore, this paper reviews the typical zinc-lanthanide single molecule magnets (SMMs) in recent years, hoping to lay a certain foundation for the development of 3d-4f SMMs.

锰–稀土单分子磁体的研究进展

自首例{Mn12Ac}单分子磁体(SMMs)报道以来,对高核含锰单分子磁体的研究引起了人们极大的兴趣,成为当前介观物理,磁学,纳米材料等学科的研究热点。Mn-Ln异金属单分子磁体,因为体系中含有两种不同属性的金属离子,其配位特性也不同,对于同一种配体还经常存在着竞争配位,反应往往比同核单分子磁体的反应要复杂,所以相对同核单分子磁体,Mn-Ln异金属单分子磁体报道的相对较少。因此,本文通过对近年来典型的锰–稀土SMMs进行综述,以期为3d-4f SMMs的发展奠定一定的基础。Since the first {Mn12Ac} single molecule magnet (SMMs) is reported, the study of high nuclear Mn-containing SMMs has aroused great interest, and has become a research hotspot in mesoscopic physics, magnetism, nanomaterials and other fields. Mn-Ln heterometallic monomolecular magnets, because the system contains two metal ions with different properties, exhibit different coordination characteristics. For the same ligand, there is often competitive coordination, and the reaction is often more complex than that of homonuclear monomolecular magnets. Thus, compared with homonuclear monomolecular magnets, Mn-Ln heterometallic monomolecular magnets have relatively few reports. Therefore, this paper reviews the typical Mn-Ln SMMs in recent years, in order to lay a certain foundation for the development of 3d-4f SMMs.

钙铝黄长石陶粒改性及处理含锰废水效能

以工业固体废弃物造纸白泥和粉煤灰为原料,通过煅烧制备钙铝黄长石陶粒,再经NaOH溶液水热反应法改性,用于含锰废水的吸附处理。利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)等方法对改性前后的陶粒进行表征,探讨陶粒水热改性机制。检测不同NaOH溶液浓度以及水热反应温度改性后陶粒的静态吸附除锰效能,并与改性前陶粒对比,确定最佳水热改性条件,并探索改性陶粒吸附除锰机理。结果表明:改性后陶粒的主矿物相仍为钙铝黄长石,但部分Ca元素被活化,生成新物相Ca(OH)_(2),提高了陶粒本身碱性,继而使锰去除率显著提高,吸附平衡时间明显缩短。4,3 mol/L的NaOH溶液浓度以及160℃的水热温度分别为2种陶粒的最佳改性条件;改性后陶粒除锰可以在10~15 min内达到吸附平衡,锰去除率接近100%。吸附过程中,Mn^(2+)与OH~-生成白色Mn(OH)_(2)沉淀,然后被氧化为黑褐色的MnO(OH)_(2),最终被陶粒表面均匀吸附,实现了固体废弃物资源化利用,达到以废治废的目的。