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Instant Detection of Hydrogen Cyanide Gas and Cyanide Salts in Solid Matrices and Water by using Cu II and Ni II Complexes of Intramolecularly Hydrogen Bonded Zwitterions
Author(s) -
Nair Ratish R.,
Raju M.,
Jana Kalyanashis,
Mondal Dhrubajyoti,
Suresh E.,
Ganguly Bishwajit,
Chatterjee Pabitra B.
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201800894
Subject(s) - chemistry , cyanide , aqueous solution , hydrogen cyanide , protonation , hydrogen bond , hydrogen , inorganic chemistry , naked eye , diamine , molecule , ion , polymer chemistry , organic chemistry , chromatography , detection limit
A series of intramolecularly hydrogen‐bonded zwitterionic compartmental ligands HL1 – HL4 , containing a pendent diamine arm that is monoprotonated and an aldehyde functionality at two different ortho ‐positions of a 4‐halophenoxide, is reported herein. Single‐crystal X‐ray diffraction (SXRD) provides persuasive evidence for the identification of this class of proton‐transferred zwitterions at room temperature. The solid‐state photoluminescent nature of these zwitterions remains intact in aqueous and organic solutions. Grinding of HL1 and HL2 with Cu 2+ /Ni 2+ salts develop turn‐on probes 1 – 4 . Compounds 1 and 4 are dinuclear Cu II and Ni II species, respectively. Compound 2 is a tetranuclear Cu II complex. Interestingly, compound 3 is a mononuclear Ni II species in which both nitrogen atoms in the pendant diamine arm are protonated and, therefore, not coordinated to the Ni II center. All these probes ( 1 – 4 ) display an instant response to the poison gas hydrogen cyanide (HCN) and cyanide salts present in both solid matrices and aqueous (100 % water) solution. Selective and rapid sensing of HCN gas and cyanide salts in solid/soil/water phases, without any interference, by the mechanosynthesized complexes 1 – 4 can be perceived easily by the naked eye under a hand‐held UV lamp.