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首页> 外文期刊>Chemistry: A European journal >Hybrid Molecular Magnets Obtained by Insertion of Decamethylmetallocenium Cations into Layered, Bimetallic Oxalate Complexes: [Z~IIICp_2~*][M~IIM~III(ox)_3] (Z~III=Co, Fe; M~III=Cr, Fe; M~II=Mn,Fe,Co,Cu,Zn; ox=oxalate; Cp~*=pentamethylcyclopentadien
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Hybrid Molecular Magnets Obtained by Insertion of Decamethylmetallocenium Cations into Layered, Bimetallic Oxalate Complexes: [Z~IIICp_2~*][M~IIM~III(ox)_3] (Z~III=Co, Fe; M~III=Cr, Fe; M~II=Mn,Fe,Co,Cu,Zn; ox=oxalate; Cp~*=pentamethylcyclopentadien

机译：通过将十甲基金属alloc阳离子插入层状双金属草酸酯络合物中获得的杂化分子磁体：[Z〜IIICp_2〜*] [M〜IIM〜III（ox）_3]（Z〜III = Co，Fe; M〜III = Cr，Fe ; M〜II = Mn，Fe，Co，Cu，Zn; ox =草酸盐; Cp〜* =五甲基环戊二烯

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A new series of hybrid organometallic-inorganic layered magnets with the formula [Z~IIICp_2~*][M~IIM~III(ox)_3] (Z~III=Co, Fe; M~III=Cr, Fe; M~II=Mn, Fe, Co, Cu, Zn; ox=oxalate; Cp~*=pentamethylcyclopentadienyl) has been prepared. All of these compounds are isostructural and crystallize in the monoclinic space group C2/m, as found by X-ray structure analysis. Their structure consists of an eclipsed stacking of the bimetallic oxalate-based extended layers separated by layers of organometallic cations. These salts show spontaneous magnetization below T_c, which corresponds to the presence of ferro-, ferrior canted antiferromagnetism. Compounds in which the paramagnetic decamethylferrocenium is used instead of the diamagnetic decamethylcobaltocenium are good examples of chemically constructed magnetic multilayers with alternating ferromagnetic and paramagnetic layers. The physical properites of this series have been thoroughly studied by means of magnetic measurements and ESR and Mossbauer spectroscopy. We have found that the two layers are electronically quasiindependent. As a consequence, the bulk properties of these magnets have not been significantly affected by the insertion of a paramagnetic layer of S=1/2 spins in between the extended layers. In fact, the critical temperatures remain unchanged even when comparing [MCp_2~*]~+ derivatives with [XR_4]~+ compounds (X=N, P; R=Ph, nPr, nBu). Nevertheless, the presence of the paramagnetic layer has been shown to have some influence on the hysteresis loops of these compounds In the same context, the spin polarization of the paramagnetic units (which arises from the internal magnetic field created by the bimetallic layers in the ordered state) has been observed by Mossbauer and ESR spectroscopy.
机译：[Z〜IIICp_2〜*] [M〜IIM〜III（ox）_3]（Z〜III = Co，Fe; M〜III = Cr，Fe; M〜已经制备了II ＝ Mn，Fe，Co，Cu，Zn; ox ＝草酸盐; Cp〜* ＝五甲基环戊二烯基。通过X射线结构分析发现，所有这些化合物在单斜空间群C2 / m中都是同构的，并且是结晶的。它们的结构由双金属草酸盐基扩展层的月蚀堆叠组成，该扩展层被有机金属阳离子层隔开。这些盐显示出低于T_c的自发磁化强度，这对应于铁，铁倾斜的反铁磁性的存在。使用顺磁性十甲基二茂铁ce代替抗磁性十甲基钴十ce的化合物是具有交替的铁磁性层和顺磁性层的化学构造的磁性多层的良好实例。该系列的物理性质已通过磁测量，ESR和Mossbauer光谱学进行了深入研究。我们发现这两个层在电子上是准独立的。结果，在延伸层之间插入S ＝ 1/2自旋的顺磁性层并没有显着影响这些磁体的整体性能。实际上，即使将[MCp_2〜*]〜+衍生物与[XR_4]〜+化合物（X = N，P; R = Ph，nPr，nBu）进行比较，临界温度也保持不变。然而，已证明顺磁性层的存在对这些化合物的磁滞回线有一定影响。在同一情况下，顺磁性单元的自旋极化（由双金属层按有序排列产生的内部磁场产生）状态）已通过Mossbauer和ESR光谱进行了观察。

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