Whereas the bis(imine)imidazolium salt 1·Cl is a potential precursor to a N^imineC^NHCN^imine pincer-type ligand, it reacted with [Pt(cod)₂] to give the Pt^II NHC hydrido complex 3, in which chloride coordination and C^NHCN^imine chelation is preferred over pincer formation. Unexpectedly, reaction of 1·BF₄ with [Pt(cod)₂] afforded the unprecedented, 56 CVE tetrahedral cluster [Pt₄(μ-H)(cod)₄]BF₄ (7), which was fully characterized. Imidazolium salts are ubiquitous sources of the much studied NHC ligands and not expected to lead to the formation of metal clusters.

中文翻译：

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咪唑盐和 [Pt(cod)2]：从 NHC 氢化配合物到前所未有的烯烃四面体簇 [Pt4(μ-H)(cod)4]BF4

而双（亚胺）咪唑鎓盐1 ·Cl 是 N^亚胺C ^NHC N^亚胺钳形配体的潜在前体，它与 [Pt(cod) ₂ ] 反应得到 Pt ^II NHC 氢化物复合物3，其中氯化物配位和 C ^NHC N^亚胺螯合优于钳形形成。出乎意料的是，1 ·BF ₄与 [Pt(cod) ₂ ] 的反应提供了前所未有的 56 CVE 四面体簇 [Pt ₄ (μ-H)(cod) ₄ ]BF ₄ ( 7)，这是完全表征。咪唑盐是广泛研究的 NHC 配体的普遍来源，预计不会导致金属簇的形成。