Journal
DALTON TRANSACTIONS
Volume 44, Issue 19, Pages 9149-9157Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5dt00937e
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Funding
- Council of Scientific and Industrial Research [01(2694)/12/EMR-II]
- Science and Engineering Research Board [SB/FT/CS-015/2012]
- Board of Research in Nuclear Science [2012/37C/61/BRNS/2776]
- Ministry of Human Resource development (MHRD)
- Council of Scientific and Industrial Research (CSIR), India
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Highly electron deficient beta-substituted Ni(II) porphyrins (1-5) were synthesized and utilized as novel sensors for selective rapid visual detection of CN- ions. This article describes the single crystal X-ray structures, electronic spectral and electrochemical redox properties of these sensors. The ratiometric and colorimetric responses of these porphyrins were monitored by the change in optical absorption spectra. These sensors were found to be highly selective for cyanide ions with extremely high binding constants (10(16)-10(8) M-2) through axial ligation of CN- ions and are able to detect <0.11 ppm of CN- ions. 1-5 were recovered from 1-5 center dot 2CN(-) adducts by acid treatment and reused without loss of sensing ability. CN- binding strongly perturbs the redox properties of the parent porphyrin p-system. The applicability of 1-5 as practical visible colorimetric test kits for CN-ions in aqueous and non-aqueous media has also been explored. The mode of binding was confirmed by single crystal X-ray, spectroscopic studies and DFT calculations.
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