The ligand exchange of guanidinate ligands between metal centres can play an important role in guanidinate chemistry, and ligand exchange between aluminium centres will form a dimeric intermediate. The synthesis and characterization of the dimer [Me2NC(NiPr)2]2Al2Cl4 (1) is reported here: compound 1 crystallizes with a twisted boat conformation of its dimer ring. This compound decomposes to monomers at room temperature over four days, or within 18 hours at 90 °C. We undertook a detailed computational characterization of the reaction pathway, which supported the dimer structure and subsequent monomer formation. The ligand exchange route was also exploited for the synthesis of [MeC(NiPr)2]2AlCl (2), [EtC(NiPr)2]2AlCl (3), [MeC(NiPr)2]2GaCl (5), and [Me2NC(NiPr)2]2GaCl (6).
金属中心之间的
胍基
配体交换在
胍基
化学中起着重要作用,而铝中心之间的
配体交换将形成二聚中间体。本文报告了二聚体 [Me2NC(NiPr)2]2Al2Cl4 (1) 的合成和表征:化合物 1 结晶时,其二聚环呈扭曲的船形构象。该化合物在室温下四天内分解为单体,在 90 °C 下 18 小时内分解为单体。我们对反应途径进行了详细的计算分析,结果支持二聚体结构和随后单体的形成。我们还利用
配体交换路线合成了 [MeC(NiPr)2]2AlCl (2)、[EtC(NiPr)2]2AlCl (3)、[MeC(NiPr)2]2GaCl (5) 和 [Me2NC(NiPr)2]2GaCl (6)。