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Single\u2010crystal X\u2010ray diffraction (SXRD) provides persuasive evidence for the identification of this class of proton\u2010transferred zwitterions at room temperature. The solid\u2010state photoluminescent nature of these zwitterions remains intact in aqueous and organic solutions. Grinding of <jats:bold>HL1<\/jats:bold> and <jats:bold>HL2<\/jats:bold> with Cu<jats:sup>2+<\/jats:sup>\/Ni<jats:sup>2+<\/jats:sup> salts develop turn\u2010on probes <jats:bold>1<\/jats:bold>\u2013<jats:bold>4<\/jats:bold>. Compounds <jats:bold>1<\/jats:bold> and <jats:bold>4<\/jats:bold> are dinuclear Cu<jats:sup>II<\/jats:sup> and Ni<jats:sup>II<\/jats:sup> species, respectively. Compound <jats:bold>2<\/jats:bold> is a tetranuclear Cu<jats:sup>II<\/jats:sup> complex. Interestingly, compound <jats:bold>3<\/jats:bold> is a mononuclear Ni<jats:sup>II<\/jats:sup> species in which both nitrogen atoms in the pendant diamine arm are protonated and, therefore, not coordinated to the Ni<jats:sup>II<\/jats:sup> center. All these probes (<jats:bold>1<\/jats:bold>\u2013<jats:bold>4<\/jats:bold>) display an instant response to the poison gas hydrogen cyanide (HCN) and cyanide salts present in both solid matrices and aqueous (100\u2009% water) solution. Selective and rapid sensing of HCN gas and cyanide salts in solid\/soil\/water phases, without any interference, by the mechanosynthesized complexes <jats:bold>1<\/jats:bold>\u2013<jats:bold>4<\/jats:bold> can be perceived easily by the naked eye under a hand\u2010held UV lamp.<\/jats:p>","DOI":"10.1002\/chem.201800894","type":"journal-article","created":{"date-parts":[[2018,5,24]],"date-time":"2018-05-24T00:34:10Z","timestamp":1527122050000},"page":"10721-10731","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Instant Detection of Hydrogen Cyanide Gas and Cyanide Salts in Solid Matrices and Water by using Cu<sup>II<\/sup> and Ni<sup>II<\/sup> Complexes of Intramolecularly Hydrogen Bonded Zwitterions"],"prefix":"10.1002","volume":"24","author":[{"given":"Ratish R.","family":"Nair","sequence":"first","affiliation":[{"name":"Analytical &amp; Environmental Science Division, and Centralized Instrument Facility CSIR-CSMCRI  G. 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