Efficient Reversible Optical Sensing of Water Achieved through the Conversion of H‐Aggregates of a Merocyanine Salt to J‐Aggregates

Sahoo, Priya Ranjan; Prakash, K. B.; Kumar, Ajeet; Kumar, Satish

doi:10.1002/slct.201700940

Cited by 20 publications

(10 citation statements)

References 51 publications

(56 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The classification of the dyes of textile finishing is based either on their chemical structure or on their method of application to different substrates such as textile fibers, paper, leathers and plastics [17, 19, 20]. Thus, there are two types of classifications such as chemical and dye classification's, in the following.…”

Section: Main Textmentioning

confidence: 99%

Textile finishing dyes and their impact on aquatic environs

Berradi

Hsissou

Khudhair

et al. 2019

Heliyon

577

208

View full text Add to dashboard Cite

In the present review, we have been able to describe the different families of dyes and pigments used in textile finishing processes (Yarns, fabrics, nonwovens, knits and rugs) such as dyeing and printing. These dyes are reactive, direct, dispersed, indigo, sulphur and vats. Such that their presence in the liquid effluents resulting from the textile washing constitutes a serious risk, in the absence of their purification, for the quality of receiving aquatic environments. Indeed, the presence of these dyes and pigments can cause a significant alteration in the ecological conditions of the aquatic fauna and flora, because of the lack of their biodegradability. This has a negative impact on the equilibrium of the aquatic environment by causing serious dangers, namely the obvious dangers (Eutrophication, under-oxygenation, color, turbidity and odor), the long-term dangers (Persistence, bioaccumulation of carcinogenic aromatic products and formation of by-products of chlorination), mutagenicity and carcinogenicity.

show abstract

Section: Main Textmentioning

confidence: 99%

Textile finishing dyes and their impact on aquatic environs

Berradi

Hsissou

Khudhair

et al. 2019

Heliyon

577

208

View full text Add to dashboard Cite

show abstract

“…Due to the high polarity of the merocyanine form and the presence of the phenolic oxygen atom, it usually interacts with anions or cations. In addition, the merocyanine form also displays an intense color due to the formation of H-or J-aggregates [30]. The formation or disruption of aggregation may further lead to a change in color or emission [31,32].…”

Section: Introductionmentioning

confidence: 99%

Colorimetric and Fluorescence-Based Detection of Mercuric Ion Using a Benzothiazolinic Spiropyran

Kumar

Sahoo

et al. 2019

Chemosensors

View full text Add to dashboard Cite

A merocyanine dye as a p-toluenesulfonate salt was synthesized. The structure of the dye was characterized using IR, NMR, HR-MS and single crystal X-ray crystallography. The X-ray crystallographic studies revealed the formation of a stacked aggregated structure of the merocyanine dye. The stacking interactions were investigated using the Crystal Explorer program, which estimated the strength of the interactions between different molecular pairs. The merocyanine dye was screened for affinity towards heavy metal ions, which revealed a color change from pink to colorless in the presence of mercuric ions, while other metal ions did not produce a similar change in color. In addition, the fluorescence spectroscopy indicated a change in the fluorescence intensity upon addition of mercuric ions. Both techniques displayed a good limit of detection value towards mercuric ions. In addition, the pixel intensity-based detection technique was also employed for the determination of limit of detection value with the help of a smartphone. The dynamic light scattering (DLS) studies indicated that the optical change occurred in the spectra of the receptor is due to the disaggregation of the receptor induced by mercuric ions. In addition, 1H-NMR studies were also used for investigating the mechanism of interaction between the receptor and the mercuric ions. The density functional theory (DFT) studies were used to investigate the formation of the complex at the molecular level, while time dependent density functional theory (TD-DFT) studies were used to understand the observed absorption spectra through the calculation of electronic excitation parameters, which indicated an increase in the energy difference between ground and the excited state.

show abstract

“…A variety of sensors based on J‐aggregates are used to develop colorimetric and fluorometric sensors, but rarely H‐aggregates are used for similar applications ,. However, interconversion between H‐ and J‐aggregates was rarely utilized to develop a sensor for an analyte . The sensing device with good optical response (colorimetric and fluorometric) for the detection and monitoring of toxic anions is appealing due to the convenient processing such as simple naked eye detection technique in comparison to other expensive techniques .…”

Section: Introductionmentioning

confidence: 99%

Visible Light Controlled Aggregation of a Spiropyran‐HSO₄⁻ Complex as a Strategy for Reversible Detection in Water

et al. 2017

Self Cite

View full text Add to dashboard Cite

A merocyanine salt form of a substituted spiropyran was synthesized and evaluated for stimuli-responsive properties. The HSO 4 À induced H-aggregation of the merocyanine salt was used as a strategy for detection in pure water. The anion induced aggregation was controlled by light, which converted the open merocyanine form into the closed spiropyran form.The formation of the closed form released the hydrogen sulfate ion. The DLS and TEM analyses were used to investigate the aggregation and disaggregation of the merocyanine salt form of a spiropyran. Therefore, the study establishes the first example of reversible, highly selective and nanomolar level response towards HSO 4 À ion in water.

show abstract

Efficient Reversible Optical Sensing of Water Achieved through the Conversion of H‐Aggregates of a Merocyanine Salt to J‐Aggregates

Cited by 20 publications

References 51 publications

Textile finishing dyes and their impact on aquatic environs

Textile finishing dyes and their impact on aquatic environs

Colorimetric and Fluorescence-Based Detection of Mercuric Ion Using a Benzothiazolinic Spiropyran

Visible Light Controlled Aggregation of a Spiropyran‐HSO₄⁻ Complex as a Strategy for Reversible Detection in Water

Contact Info

Product

Resources

About

Efficient Reversible Optical Sensing of Water Achieved through the Conversion of H‐Aggregates of a Merocyanine Salt to J‐Aggregates

Cited by 20 publications

References 51 publications

Textile finishing dyes and their impact on aquatic environs

Textile finishing dyes and their impact on aquatic environs

Colorimetric and Fluorescence-Based Detection of Mercuric Ion Using a Benzothiazolinic Spiropyran

Visible Light Controlled Aggregation of a Spiropyran‐HSO4− Complex as a Strategy for Reversible Detection in Water

Contact Info

Product

Resources

About

Visible Light Controlled Aggregation of a Spiropyran‐HSO₄⁻ Complex as a Strategy for Reversible Detection in Water