Reduction of the indate complex In(NON^Ar)(μ‐Cl)₂Li(OEt₂)₂ (NON^Ar=[O(SiMe₂NAr)₂]²⁻; Ar=2,6‐iPr₂C₆H₃) with sodium generates the In^II diindane species [In(NON^Ar)]₂. Further reduction with a mixture of potassium and [2.2.2]crypt affords the In^I N‐heterocyclic indyl anion [In(NON^Ar)]⁻, which crystallizes with a non‐contacted [K([2.2.2]crypt)]⁺ cation. The indyl anion can also be isolated as the indyllithium compound In(NON^Ar)(Li{THF}₃), which contains an In−Li bond. Density functional theory calculations show that the HOMO of the indyl anion is a metal‐centred lone pair, and preliminary reactivity studies confirm its nucleophilic behaviour.

中文翻译：

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茚基锂和茚基阴离子[InL]-：N-杂环卡宾的重类似物

减少In（NON ^Ar）（μ-Cl）₂ Li（OEt ₂）₂（NON ^Ar = [O（SiMe ₂ NAr）₂ ] ^2-的初始络合物; Ar = 2.6- i Pr ₂ C ₆ H ₃）与钠一起生成In ^II二氢茚类[In（NON ^Ar）] ₂。用和[2.2.2]隐窝得到钾的混合物进一步减少在^我N-杂环吲哚基阴离子[在（NON^氩）] ^- ，其与未接触的结晶[K（[2.2.2]隐窝）] ⁺阳离子。所述茚基阴离子也可以作为包含In-Li键的茚基锂化合物In（NON ^Ar）（Li {THF} ₃）被分离。密度泛函理论计算表明，吲哚阴离子的HOMO是一个以金属为中心的孤对，并且初步的反应活性研究证实了其亲核行为。