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Pyridyl Azo‐Based Progelator in Selective Sensing of Hg 2+ and Ag + Ions via Sol to Gel Conversion
Author(s) -
Raza Rameez,
Dey Nilakshi,
Panja Atanu,
Ghosh Kumaresh
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201903069
Subject(s) - aldehyde , chelation , chemistry , ion , metal ions in aqueous solution , metal , sol gel , covalent bond , ligand (biochemistry) , polymer chemistry , nuclear chemistry , inorganic chemistry , catalysis , materials science , organic chemistry , nanotechnology , receptor , biochemistry
A pyridyl azo‐based progelator 1 has been designed and synthesized for selective detection of Hg 2+ and Ag + ions in sol‐gel media. Compound 1 acts as nongelator in DMSO‐H 2 O (1:1, v/v) while its aldehyde‐counterpart 3 forms stable gel under identical conditions. The specific Hg 2+ ‐induced deprotection of the thioacetal functionality in 1 results in in‐situ formation of the precursor aldehyde 3 and thereby induces sol‐to‐gel transformation in DMSO‐H 2 O (1:1, v/v). Gelation is also observed in the presence of Ag + ion. Interestingly, the gelation modes of 1 in the presence of Hg 2+ and Ag + ions are different. The Hg 2+ ‐induced gelation involves dosimetric sensing while the Ag + ‐induced gelation involves simple metal‐ligand non‐covalent interaction, as established by using different chelating agents and spectroscopic techniques. The design of metal‐responsive low molecular weight gelators (LMWGs) involving protection/deprotection of functional groups in gelator structure is rarely investigated in the literature and hence draws attention.