Abstract
Striking colorimetric probe (CynH) for abrupt detection of hydrazine under complete aqueous solution was achieved. The water soluble probe was designed with electron "push-pull" strategy by coupling of 4-hydroxy benzaldehyde and 2, 3, 3-trimethylindolinine. The positively charged N-propylated indolinine make the probe completely soluble in water. The probe yields eye catching selective detection of hydrazine over other competing analytes with high sensitivity. Obvious colour change was observed from colourless to appearance of bright pink colour with hydrazine. It reacts quickly with hydrazine within 2min and makes the probe an effective candidate for practical application. The real time application was demonstrated using paper strip to detect hydrazine vapour. This probe is superior to earlier reported probes because of its effective sensing of hydrazine displayed with various applications including real-time strip based sensing, spray test and soil analysis. In all the examinations, the probe yields distinct response with rapid naked eye colour change which overcomes the drawbacks of previous reports.
Highlights
Hydrazine serves as one of the major reactive base in the field of pharmaceutical chemistry and agriculture industries because of its high alkalinity and reducing capability [1,2,3]
The strips were soaked into increasing concentration of hydrazine in aqueous solution and the colour change was monitored after 2 minutes
The test strips were pasted inside the glass vial cap containing test solution (1% hydrazine) and the colour change was monitored with increasing reaction time
Summary
Hydrazine serves as one of the major reactive base in the field of pharmaceutical chemistry and agriculture industries because of its high alkalinity and reducing capability [1,2,3]. Its extensively high reducing nature promotes scavenging of oxygen from air though it applied to protect metal corrosion [4,5,6,7] It can be absorbed by the human beings via oral, transdermal and inhalation because of its completely water soluble nature and can cause severe health effects [8, 9]. It can be lethal to the living systems due to its extremely high toxicity, expected to cause serious skin allergy, skin burn and respiratory injuries to the skin by direct contact with skin [11, 12] Exposure to these kind of toxic chemicals for long period of time will leads to anaemia, severe damage to the organs, abnormal changes in the metabolism and even worse can cause cancer [13]. The advantages of the probe was utilized to detect the hydrazine vapour in real time sensing using eco-friendly test strips and soil samples
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