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The reaction temperature, pressure, and stoichiometry were optimized. The crystal structures of M[PF<jats:sub>2<\/jats:sub>(CN)<jats:sub>4<\/jats:sub>] (M=[nBu<jats:sub>4<\/jats:sub>N]<jats:sup>+<\/jats:sup>, Ag<jats:sup>+<\/jats:sup>, K<jats:sup>+<\/jats:sup>, Li<jats:sup>+<\/jats:sup>, H<jats:sub>5<\/jats:sub>O<jats:sub>2<\/jats:sub><jats:sup>+<\/jats:sup>) were determined. X\u2010ray crystallography showed the exclusive formation of the cis isomer in accord with <jats:sup>31<\/jats:sup>P and <jats:sup>19<\/jats:sup>F solution NMR spectroscopy data. Starting with the K[PF<jats:sub>2<\/jats:sub>(CN)<jats:sub>4<\/jats:sub>] the room temperature ionic liquid EMIm[PF<jats:sub>2<\/jats:sub>(CN)<jats:sub>4<\/jats:sub>] was prepared exhibiting a rather low viscosity.<\/jats:p>","DOI":"10.1002\/anie.201412209","type":"journal-article","created":{"date-parts":[[2015,2,20]],"date-time":"2015-02-20T09:29:53Z","timestamp":1424424593000},"page":"4474-4477","source":"Crossref","is-referenced-by-count":18,"title":["Tetracyanido(difluorido)phosphates 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