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Three terminal SnE bonds are present in the imidotin clusters [(thf)LiSn3E3(μ3-NtBu)4]− (E=Se, Te; see picture: N blue; Sn gray; Te orange; Li purple; O red) that are readily obtained under mild conditions, as solvent-separated ion pairs with [Li(thf)4]+ (E=Se, Te) or [(thf)Li([12]crown-4)]+ counterions (E=Se), by the reactions of the anionic cluster [(thf)LiSn3(μ3-NtBu)4]− with the appropriate chalcogen.
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Chivers et al. (2004) studied this question.
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