A light controlled, sensitive, selective and portable spiropyran based receptor for mercury ions in aqueous solution

Kumar, Arvind; Sahoo, Priya Ranjan; Arora, Priya; Kumar, Satish

doi:10.1016/j.jphotochem.2019.112061

Cited by 37 publications

(30 citation statements)

References 47 publications

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“…The availability of a methoxy group at a unique position ortho to the phenolic oxygen atom provides a suitable scaffold to capture metal ion effectively. For instance, the incorporation of a nitro group at para position and a donor methoxy group at ortho position with respect to the oxygen of the phenolic moiety produced a receptor with an affinity for mercuric ion . The metal ion‐induced transformation of the spiro form into a stereoisomer of the MC form through binding with two oxygen atoms leads to the stabilization to the MC form .…”

Section: Introductionmentioning

confidence: 99%

“…For instance, the incorporation of a nitro group at para position and a donor methoxy group at ortho position with respect to the oxygen of the phenolic moiety produced a receptor with an affinity for mercuric ion . The metal ion‐induced transformation of the spiro form into a stereoisomer of the MC form through binding with two oxygen atoms leads to the stabilization to the MC form . Owing to the highly conjugated nature of the MC form that binds the metal ion, an absorption band shift from UV to the visible region can be expected with intense color change .…”

Section: Introductionmentioning

confidence: 99%

“…The metal ion‐induced transformation of the spiro form into a stereoisomer of the MC form through binding with two oxygen atoms leads to the stabilization to the MC form . Owing to the highly conjugated nature of the MC form that binds the metal ion, an absorption band shift from UV to the visible region can be expected with intense color change . Therefore, metal ions can detected with ease in aqueous solution through this mechanism .…”

Section: Introductionmentioning

confidence: 99%

“…Owing to the highly conjugated nature of the MC form that binds the metal ion, an absorption band shift from UV to the visible region can be expected with intense color change . Therefore, metal ions can detected with ease in aqueous solution through this mechanism . In addition, the complex between a stereoisomer of the MC form and metal ion upon exposure to visible light may provide unbound spiro (SP) form of the molecule with the release of the metal ion .…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, metal ions can detected with ease in aqueous solution through this mechanism . In addition, the complex between a stereoisomer of the MC form and metal ion upon exposure to visible light may provide unbound spiro (SP) form of the molecule with the release of the metal ion . The merocyanine form undergoes cis ‐ trans isomerization to produce a mixture of stereoisomers .…”

Section: Introductionmentioning

confidence: 99%

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A Smartphone‐Assisted Sensitive, Selective and Reversible Recognition of Copper Ions in an Aqueous Medium

2020

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A photochromic substituted spiropyran (8-methoxy-1,3',3'trimethylspiro[chromene-2,2'indoline]) was successfully synthesized and its structural integrity was ascertained using spectroscopic methods. Owing to the uniquely positioned methoxy and phenolic groups for potential coordination with a metal ion, it was investigated for the recognition of toxic metal ions. The spiropyran derivative responded to the presence of Cu 2 + ions in an aqueous solution by displaying a color change visible to the naked eye (colorless to pink). The color change was witnessed due to the Cu 2 + ion-induced transformation of the closed-form (spiro) of the substituted spiropyran derivative into an open merocyanine (MC) form, which complexes the Cu 2 + ion. The color change was further used for the quantification of Cu 2 + ion concentration in water using a smartphone captured digital images via pixel intensity analysis. The spiropyran derivative displayed 0.24 � 0.01 μM, 0.65 � 0.06 μM (0.61 � 0.06 μM using paper strips) as the LOD for Cu 2 + ions using UV-Visible spectroscopy and digital colorimetry, respectively. The density functional theory (DFT) calculations and Job's plot supported the formation of a 2 : 1 (H: G) complex between the spiropyran derivative and copper ions. The time-dependent DFT (TD-DFT) investigations were also used to understand the color change during the complex formation, which indicated a good correlation between the experimental and theoretical results at the molecular level.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Smartphone‐Assisted Sensitive, Selective and Reversible Recognition of Copper Ions in an Aqueous Medium

2020

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PhotoMetrix and colorimetric image analysis using smartphones

Böck

Helfer

Costa

et al. 2020

Journal of Chemometrics

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The steady advances in technology employed in smartphones, coupled with the high availability and the ease access to these devices, increased the interest in applying it to analytical purposes. The main goal is to develop simple, fast, and low-cost analytical methods, generating immediate results. Different analytical strategies using smartphones have been proposed to identify or determine different analytes in a wide range of matrices. Some of them use the smartphone to capture the images, to process them, and to provide the analytical results. Others use this device just for image acquisition. In this context, this review aimed to relate previous works that used smartphones to acquire images for analytical purposes, with a special focus on PhotoMetrix application, which is a tool for chemical analysis. This application allows the decomposition of digital images acquired by smartphone cameras and to process them within the same device, allowing in situ chemical analysis.

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Cyanide‐Ion‐Induced J‐Aggregation of Merocyanine Dye for Paper‐Based Colorimetric Detection in Water

Kumar

2021

ChemistrySelect

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A probe based on merocyanine dye was synthesized as a salt of p‐toluenesulfonate. Owing to the high solubility of merocyanine dye in water and H‐bonding ability, it was investigated for anion‐induced aggregation properties in the buffered medium [CH3CN: water (1 : 1/v: v)]. The probe recognized the existence of cyanide ion by forming an H‐bond and displacing the p‐toluenesulfonate group. The probe displayed a bluish‐purple color in response to cyanide ion addition, which was initially light pink. The complex formation and aggregation properties of the probe were investigated using techniques like naked eye detection, digital colorimetry, UV‐Visible, 1H‐NMR, and dynamic light scattering (DLS). Paper and solution‐based techniques aided by a smartphone were also used successfully in the determination process. An excellent limit of detection value (LOD) was witnessed in all the techniques exploited for sensing cyanide ions. Methods based on density functional theory (DFT) were also used to investigate the complex formation and observed a good correlation in experimental and theoretical results.

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A light controlled, sensitive, selective and portable spiropyran based receptor for mercury ions in aqueous solution

Cited by 37 publications

References 47 publications

A Smartphone‐Assisted Sensitive, Selective and Reversible Recognition of Copper Ions in an Aqueous Medium

A Smartphone‐Assisted Sensitive, Selective and Reversible Recognition of Copper Ions in an Aqueous Medium

PhotoMetrix and colorimetric image analysis using smartphones

Cyanide‐Ion‐Induced J‐Aggregation of Merocyanine Dye for Paper‐Based Colorimetric Detection in Water

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