Surprising discoveries on the way to an old compound: four transient iodido antimonates

摘要

During the synthesis of the literature-known iodido antimonate [Cu(MeCN)(4)](4)[Sb3I11](2) (MeCN = acetonitrile), four transient compounds, [Cu(MeCN)(4)](4)[Sb6I22]2MeCN (1), [Cu(MeCN)(4)](4)[Sb7I25]MeCN (2), [Cu(MeCN)(4)](4)[Sb10I34] (3) and [Cu(MeCN)(4)](4)[Sb8I28] (4), were identified. The compounds appeared within hours or days and subsequently re-dissolved in the mother liquor, leading to [Cu(MeCN)(4)](4)[Sb3I11](2) as the final product. Single crystal X-ray analysis showed that all four compounds feature unprecedented anion motifs.