Abstract

FRONTIERS OF FORMAZANS CHEMISTRY: A REVIEW

Sanjeev Kumar*, Rajeev Sharma and Nitika

Abstract

In this review, an emphasis has been laid on methods of synthesis, characterization, plausible structure, physical and chemical properties of formazans. Various aspects of the formazan chemistry such as, their solvatochromic behaviour, analytical and pharmacological activities, use of formazans as naked eye colorimetric chemical sensors, redox behaviour using electrochemical method and other various applications of differently 3-substituted formazans have been unraveled. The review revealed that the characteristic skeleton (I) of the formazan moiety enabled it to be used as a potential functionalized molecule, delivering various useful applications.

Keywords: Formazan, tetrazolium salt, tautomerism, diazonium salts, solvatochromism, naked eye chemical sensor.