Efficient Reversible Optical Sensing of Water Achieved through the Conversion of H‐Aggregates of a Merocyanine Salt to J‐Aggregates. Issue 21 (25th July 2017)

• Record Type: Journal Article
• Authors: Sahoo, Priya Ranjan; Prakash, Kunal; Kumar, Ajeet; Kumar, Satish
• Is Part Of: ChemistrySelect. Volume 2:Issue 21(2017)
• Page Start: 5924
• Page End: 5932
• Publication Date: 2017-07-25
• Subjects: H-aggregates -- J-aggregates -- Optical sensor for water -- Reversible colorimetric sensor -- Water sensor; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201700940
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: A stable MC (merocyanine)‐spiropyran as p ‐toluenesulfonate salt was synthesized. The structure of the merocyanine salt form of the spiropyran was established by using IR, 1 H‐NMR, 13 C‐NMR, 2D‐NMR and HR‐MS spectroscopic techniques. The MC salt was employed as an optical probe for the detection of trace water content in the organic media using the naked eye, UV‐Visible and fluorescence spectroscopic techniques. The DLS and TEM measurements were used to support the aggregation and disaggregation of the MC salt form. The results established the conversion of H‐ aggregates to J‐ aggregates can be used for the efficient detection of trace water content in organic media. The optical probe was further used to sense and quantify water molecules associated with the metal salts. The probe can be used multiple times for sensing water. The results provide insightful opportunities for practical applications of sensing trace water content in organic solvents and coordinated to metal ions. Abstract : The trace water content present in different organic solvents was detected using an MC salt form of spiropyran, which produced an optical change induced by water. The MC salt form displayed H‐aggregates in dry organic solvents. In the presence of water, the probe displayed J‐ or disaggregated from of1 . The optical probe was further used to determine water molecules associated with the metal salts.