Polyoxometalate based ionic crystal: dual applications in selective colorimetric sensor for hydrated ZnCl2 and antimicrobial activity

One-pot synthesis of POM-salt ([Himi]4[SiMo12O40] (1)) was achieved by mixing silicomolybdic acid and imidazole in acidic conditions and characterized by FTIR, TGA, SEM, EDX, ICP-OES and XPS. The structure of 1 was confirmed by single crystal X-ray analysis. The matching of the simulated PXRD patter...

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Bibliographic Details
Published in:New journal of chemistry 2021-03, Vol.45 (12), p.5576-5588
Main Authors: Sabarinathan, C, Karthikeyan, M, Murugappan, R M, Savarimuthu, Philip Anthony, Bhaskaran Shankar, Parthasarathy, Kannabiran, Arumuganathan, T
Format: Article
Language:English
Subjects:
Antiinfectives and antibacterials
Biological activity
Color
Colorimetry
Crystal structure
Crystallography
Ethylenediaminetetraacetic acids
Imidazole
Ionic crystals
Microorganisms
Polyoxometallates
Single crystals
X ray analysis
X ray photoelectron spectroscopy
Zinc chloride
Zinc salts
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Summary:One-pot synthesis of POM-salt ([Himi]4[SiMo12O40] (1)) was achieved by mixing silicomolybdic acid and imidazole in acidic conditions and characterized by FTIR, TGA, SEM, EDX, ICP-OES and XPS. The structure of 1 was confirmed by single crystal X-ray analysis. The matching of the simulated PXRD pattern with the experimental pattern indicates the phase purity of 1. Interestingly, 1 showed highly selective and sensitive colorimetric detection of hydrated zinc chloride (ZnCl2·2H2O). The addition of ZnCl2·2H2O into 1 in the DMSO–H2O mixture shows the formation of blue colour. Furthermore, metal ions including other anionic zinc salts did not produce any colour change. The limit of detection was calculated to be 0.15 μM. Similarly, solid mixing of ZnCl2·2H2O with 1 can also produce a visible blue colour change. On the other hand, anhydrous ZnCl2 did not form any color change under the same conditions. The mechanistic studies indicate that the reduction of Mo6+ to Mo5+ might be responsible for the selective colour change. The reversible colour change between colorless and blue colour upon addition of EDTA into 1-ZnCl2·2H2O demonstrates the reusability of 1. Furthermore, microbial activity of 1 was investigated towards a series of Gram-positive and Gram-negative bacterial and fungal strains. Effective bactericidal activity of 1 was analyzed against Staphylococcus aureus.
ISSN:1144-0546
1369-9261
DOI:10.1039/d1nj00138h