Optical "Turn off" based selective detection and concomitant degradation of 2-chloroethyl ethyl sulfide (CEES) via Mg-porphyrazine complex immobilized on glass.
Covalently assembled monolayers (CAMs) of Mg-porphyrazine complex on glass and silicon substrates were fabricated and employed as "Turn off" sensor for ppm level detection and degradation of a sulfur mustard analogue: 2-chloroethyl ethyl sulfide (CEES). The detection process was read-out optically via an off-the-shelf UV/Vis spectrophotometer in transmission mode. Monolayer based sensor system was shown to be quite robust and stable, sufficiently accurate and reversible under given experimental conditions. Notably, the sensor system exhibited marked selectivity for CEES when exposed exclusively or in mix to different potent analytes. Moreover, action of KMnO4 on monolayer-CEES complex lead to CEES degradation and resetting of the sensor to its native state for reuse.
Department of Chemistry, University of Delhi, Delhi 110 007, India; Department of Biological Chemistry, Ariel University, Ariel 40 700, Israel.
Neelam
Department of Chemistry, University of Delhi, Delhi 110 007, India. Electronic address: vikram.singh19@yahoo.co.in.
Vikram
V
Singh
Department of Chemistry, University of Delhi, Delhi 110 007, India.
Tarkeshwar
T
Gupta
D005898:Glass; D057230:Limit of Detection; D008274:Magnesium / Q000737:chemistry*; D009151:Mustard Gas / Q000031:analogs & derivatives* / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet
C031278:2-chloroethyl ethyl sulfide; D008274:Magnesium; D009151:Mustard Gas
Chemical warfare; Monolayer based sensing; Optical monitoring; Porphyrazine; Sulfur mustard