Complex Formation of Calcium Bis(tetraethylaluminate) with N‐Donor Ligands

Complex Formation of Calcium Bis(tetraethylaluminate) with N‐Donor Ligands
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双(四乙基铝)钙与 Nâdonor 配体形成络合物

DOI:
10.1002/ejic.201200453
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发表时间:
2012
影响因子:
2.3
通讯作者:
N. W. Mitzel
N. W. Mitzel
中科院分区:
化学3区
文献类型:
--
作者:
M. Hülsmann;B. Neumann;H.-G. Stammler;N. W. Mitzel

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双齿N -供体配体四甲基亚二胺(L = TMMDA)、四甲基乙二胺(L = TMEDA)和N,N ' -二甲基哌嗪(L = DMP)和三齿N -供体配体1,3,5 -三烷基- 1,3,5 -三氮环己烷{L =cyclo - [N(R)CH2]3, R = Me (TMTAC), Cy (TCyTAC),tBu (TtBuTAC)}处理双(四乙基铝酸钙),形成了分子式[Ca(AlEt4)2L]的配合物。这些化合物通过核磁共振光谱和元素分析进行了表征。从TMMDA、DMP、TCyTAC和TMTAC配合物中获得了适合X射线衍射实验的单晶。在TMTAC的情况下,配合物结晶时有两个TMTAC配体与Ca原子结合,[Ca(AlEt4)2(TMTAC)2],但在溶液中只有一个TMTAC配体与Ca原子结合。在不同温度下的核磁共振波谱显示四乙基铝酸盐单元在这些化合物中是动态结合的(即,它们被发现是部分解离的)。这种动态键合的情况避免了空间过度拥挤,并且与相关的稀土金属化合物不同,这种行为抑制了进一步的降解反应。双(四乙基铝酸钙)与NH官能团二异丙胺发生脱质子反应,生成二聚体钙酰胺[(η2‐AlEt4)2Ca(μ‐NiPr2)2Ca(η2‐AlEt4)2]。该化合物通过单晶X射线衍射、核磁共振光谱和元素分析进行了表征。
Treatment of calcium bis(tetraethylaluminate) with the bidentate N‐donor ligands tetramethylmethylenediamine (L = TMMDA), tetramethylethylenediamine (L = TMEDA) andN,N′‐dimethylpiperazine (L = DMP) and the tridentate N‐donor ligands 1,3,5‐trialkyl‐1,3,5‐triazacyclohexane {L =cyclo‐[N(R)CH2]3, R = Me (TMTAC), Cy (TCyTAC),tBu (TtBuTAC)} resulted in the formation of complexes of the formulae [Ca(AlEt4)2L]. These compounds were characterised by NMR spectroscopy and elemental analyses. Single crystals suitable for X‐ray diffraction experiments were obtained from the TMMDA, DMP, TCyTAC and TMTAC complexes. In the case of TMTAC, the complex crystallises with two TMTAC ligands bonded to the Ca atom, [Ca(AlEt4)2(TMTAC)2], but in solution only one TMTAC ligand is bonded to the Ca atom. NMR spectroscopy at various temperatures shows the tetraethylaluminate units to be dynamically bonded in these compounds (i.e., they are found to be partially dissociated). This dynamic bonding situation avoids steric overcrowding and – unlike related rare‐earth metal compounds – this behaviour inhibits further degradation reactions. The reaction of calcium bis(tetraethylaluminate) with the NH‐functional diisopropylamine leads to its deprotonation and results in the formation of a dimeric calcium amide [(η2‐AlEt4)2Ca(μ‐NiPr2)2Ca(η2‐AlEt4)2]. This compound was characterised by single‐crystal X‐ray diffraction, NMR spectroscopy and elemental analyses.
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