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The anion is iso(valence)electronic with and structurally analogous to the carbonate ion. Despite the high negative charge of the anion, the Sn\u2212Bi bond lengths range between single and double bonds. Quantum\u2010chemical calculations at a DFT\u2010PBE0\/def2\u2010TZVPP\/COSMO level of theory reveal that the partial double bond character between the heavy main\u2010group atoms Bi and Sn originates from a delocalized \u03c0\u2010electronic system. The structure of the anion is determined by single\u2010crystal X\u2010ray diffraction analyses of the compounds K<jats:sub>5<\/jats:sub>[SnBi<jats:sub>3<\/jats:sub>] 9\u2009NH<jats:sub>3<\/jats:sub> (<jats:bold>1<\/jats:bold>) and K<jats:sub>9<\/jats:sub>[K(18\u2010crown\u20106)][SnBi<jats:sub>3<\/jats:sub>]<jats:sub>2<\/jats:sub>\u22c515\u2009NH<jats:sub>3<\/jats:sub> (<jats:bold>2<\/jats:bold>). The [SnBi<jats:sub>3<\/jats:sub>]<jats:sup>5\u2212<\/jats:sup> unit is the first example of a carbonate\u2010like anion obtained from solution, and it consists exclusively of metal atoms and completes the series of metal analogues of CO and CO<jats:sub>2<\/jats:sub>.<\/jats:p>","DOI":"10.1002\/anie.201709700","type":"journal-article","created":{"date-parts":[[2017,9,22]],"date-time":"2017-09-22T19:22:44Z","timestamp":1506108164000},"page":"15159-15163","source":"Crossref","is-referenced-by-count":20,"title":["[SnBi<sub>3<\/sub>]<sup>5\u2212<\/sup>\u2009\u2014A Carbonate Analogue Comprising Exclusively Metal Atoms"],"prefix":"10.1002","volume":"56","author":[{"given":"Kerstin","family":"Mayer","sequence":"first","affiliation":[{"name":"Department Chemie Technische Universit\u00e4t M\u00fcnchen  Lichtenbergstrasse 4 85747 Garching Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jasmin V.","family":"Dums","sequence":"additional","affiliation":[{"name":"Department 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