Homobimetallic dimetallocenes exhibiting two identical metal atoms sandwiched between two η⁵ bonded cyclopentadienyl rings is a narrow class of compounds, with representative examples being dizincocene and diberyllocene. Here we report the synthesis and structural characterization of a heterobimetallic dimetallocene, accessible through heterocoupling of lithium and aluminylene fragments with pentaisopropylcyclopentadienyl ligands. The Al–Li bond features a high ionic character and profits from attractive dispersion interactions between the isopropyl groups of the cyclopentadienyl ligands. A key synthetic step is the isolation of a cyclopentadienylaluminylene monomer, which also enables the structural characterization of this species. In addition to their structural authentication by single-crystal X-ray diffraction analysis, both compounds were characterized by multinuclear NMR spectroscopy in solution and in the solid state. Furthermore, reactivity studies of the lithium–aluminium heterobimetallic dimetallocene with an N-heterocyclic carbene and different heteroallenes were performed and show that the Al–Li bond is easily cleaved.

^{具有夹在两个η 5}键合的环戊二烯基环之间的两个相同金属原子的同质双金属二茂金属是一小类化合物，代表性实例是二锌茂和二茂茂。在这里，我们报告了异双金属二茂金属的合成和结构表征，该异双金属二茂金属可以通过锂和亚铝烯片段与五异丙基环戊二烯基配体的杂偶联来获得。 Al-Li键具有高离子特性，并受益于环戊二烯基配体的异丙基之间有吸引力的分散相互作用。关键的合成步骤是环戊二烯基亚铝烯单体的分离，这也使得该物质的结构表征成为可能。除了通过单晶 X 射线衍射分析进行结构验证外，这两种化合物还通过溶液和固态多核 NMR 光谱进行了表征。此外，对锂铝异双金属二茂金属与N-杂环卡宾和不同杂联烯的反应性进行了研究，结果表明Al-Li键很容易断裂。