Synthesis and Structures of Magnesium Tetrahydridoaluminates
Synthesis and Structures of Magnesium Tetrahydridoaluminates
复制标题
四氢铝酸镁的合成与结构
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
Andreas Treit
中科院分区：
文献类型：
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作者：
H. Nöth;Martin Schmidt;Andreas Treit
用X射线衍射法测定了XMg（Al H_4）·4THF（1a，2，3a）（X = Al H_4，Cl，Br）的分子结构。每个化合物都有一个六配位的Mg中心和一个通过单个氢化物桥键与该中心结合的AlH 4 −基团。制备ROMg（AlH 4）化合物的尝试仅对于空间要求高的基团R（R = CMe 3、CPh 3、naph、mes、smes）是成功的。2-萘氧基衍生物7是一种组成为（naphO）Mg-（AlH 4）· 2.5 THF的化合物，是一种具有中心Mg 2 O2环的二聚体。它的两个AlH 4 −基团之一与一个Mg原子末端相连，另一个连接两个Mg中心。该结构表明了如何从ROMg（AlH 4）化合物发生AlH 4 −转移，形成Mg（OR）2和Mg（AlH 4）2。
The molecular structures of XMg(A1H4) · 4 THF (1a, 2, 3a) (X = A1H4, Cl, Br) have been determined by X-ray structural analysis. Each compound possesses a hexacoordinated Mg center and AlH4− groups bound to this center via a single hydride bridge bond. Attempts to prepare ROMg(AlH4) compounds were successful only for sterically demanding groups R (R = CMe3, CPh3, naph, mes, smes). The 2-naphthoxy derivative 7, a compound with the composition (naphO)Mg-(AlH4) · 2.5 THF, is a dimer with a central Mg2O2 ring. One of its two AlH4− groups is terminally bound to one Mg atom, the other bridges the two Mg centers. This structure indicates how AlH4− transfer may occur from ROMg(AlH4) compounds to form Mg(OR)2 and Mg(AlH4)2.