NDLI: Ratiometric and colorimetric “naked eye” selective detection of $CN^{−}$ ions by electron deficient Ni(II) porphyrins and their reversibility studies

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Chaudhri, Nivedita Kumar, Ravi Sankar, Muniappan
Description	Author Affiliation: Kumar R ( Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 2476667, Uttarakhand, India. sankafcy@iitr.ac.in.)
Abstract	Highly electron deficient β-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 $1–5·2CN^{−}$ adducts by acid treatment and reused without loss of sensing ability. $CN^{−}$ binding strongly perturbs the redox properties of the parent porphyrin π-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.
ISSN	14779226
Issue Number	19
Volume Number	44
e-ISSN	13645447
Journal	Dalton Trans.
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2015-05-21
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Colorimetry Cyanides Analysis Metalloporphyrins Chemistry Nickel Crystallography, X-Ray Electrochemical Techniques Electrons Ions Chemical Synthesis Models, Molecular Molecular Structure Oxidation-Reduction Quantum Theory Spectrophotometry, Ultraviolet Journal Article Research Support, Non-U.S. Gov't
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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