Chemistry - A European Journal p. 10721 - 10731 (2018)
Update date:2022-07-29
Topics:
Nair, Ratish R.
Raju
Jana, Kalyanashis
Mondal, Dhrubajyoti
Suresh
Ganguly, Bishwajit
Chatterjee, Pabitra B.
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 Cu2+/Ni2+ salts develop turn-on probes 1–4. Compounds 1 and 4 are dinuclear CuII and NiII species, respectively. Compound 2 is a tetranuclear CuII complex. Interestingly, compound 3 is a mononuclear NiII species in which both nitrogen atoms in the pendant diamine arm are protonated and, therefore, not coordinated to the NiII 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.
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