Aluminum chalcogenides are mostly encountered in the form of bulk aluminum oxides that are structurally diverse but typically consist of networks with high lattice energy in which the chalcogen atoms bridge the metal centres. This makes their molecular congeners difficult to synthesize because of a pronounced tendency for oligomerization. Here we describe the isolation of the monotopic aluminum chalcogenide (L(Dip)N)AlTe(L(Et))2 (L(Dip)=1,3-(2,6-diisopropylphenyl)-imidazolin-2-imine, L(Et)=1,3-diethyl-4,5-dimethyl-imidazolin-2-ylidene). Unique features of (L(Dip)N)AlTe(L(Et))2 are the terminal position of the tellurium atom, the shortest aluminum-tellurium distance hitherto reported for a molecular complex and the highest bond order reported for an interaction between these elements, to the best of our knowledge. At elevated temperature (L(Dip)N)AlTe(L(Et))2 equilibrates with dimeric {(L(Dip)N)AlTe(L(Et))}2 in which the chalcogen atoms assume their common role as bridges between the metal centres. These findings demonstrate that (L(Dip)N)AlTe(L(Et))2 comprises the elusive Al=Te double bond in the form of an N-heterocyclic carbene-stabilized species.

中文翻译：

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N-杂环卡宾稳定的具有Al = Te双键的单峰碲化铝。

铝硫属元素化物通常以块状氧化铝的形式遇到，其结构多样，但通常由具有高晶格能的网络组成，其中硫属元素原子桥接金属中心。由于明显的低聚趋势，这使得它们的分子同源物难以合成。在这里我们描述了铝硫属元素化物（L（Dip）N）AlTe（L（Et））2（L（Dip）= 1,3-（2,6-二异丙基苯基）-咪唑啉-2-亚胺，L的分离（Et）＝ 1，3-二乙基-4，5-二甲基-咪唑啉-2-亚烷基）。（L（Dip）N）AlTe（L（Et））2的独特特征是碲原子的末端位置，迄今为止针对分子络合物报道的最短铝-碲距离以及据报道它们之间相互作用的最高键序尽我们所知。在升高的温度下，（L（Dip）N）AlTe（L（Et））2与二聚体{（L（Dip）N）AlTe（L（Et））} 2平衡，其中硫族元素原子起着共同的作用金属中心。这些发现表明，（L（Dip）N）AlTe（L（Et））2包含以N-杂环卡宾稳定的物种形式存在的难以捉摸的Al = Te双键。