Visible Light Controlled Aggregation of a Spiropyran‐HSO4− Complex as a Strategy for Reversible Detection in Water. Issue 27 (21st September 2017)

• Record Type: Journal Article
• Authors: Kumar, Ajeet; Prakash, Kunal; Sahoo, Priya Ranjan; Kumar, Satish
• Is Part Of: ChemistrySelect. Volume 2:Issue 27(2017)
• Page Start: 8247
• Page End: 8252
• Publication Date: 2017-09-21
• Subjects: Aggregation -- Light controlled complex -- Merocyanine -- Reversible HSO4− detection -- Spiropyran; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201701357
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: A merocyanine salt form of a substituted spiropyran was synthesized and evaluated for stimuli‐responsive properties. The HSO4 − 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 HSO4 − ion in water. Abstract : A highly selective and sensitive reversible optical sensor for HSO4 − ions based on merocyanine salt form of a spiropyran was developed. The optical sensor operated through the transformation of a disaggregated or J‐aggregated form into the H‐aggregated complexed form induced by HSO4 − ions. The reversibility was achieved through the conversion of receptor‐HSO4 − complex into the closed spiropyran form through visible light irradiation.