Materials Chemistry

Biography

Biography: Masood Ayoub Kaloo

Abstract

Perylenebisimides (PBIs) are highly rhobust, extensively conjugated organic materials with unique optical and redox properties. Presence of imide functionalities impart PBI a highly electron-deficient nature and hence n-type semiconductivity. The dyes can be reduced to corresponding radical anions, hence potential to store electrical energy. For the first time, we attempted to reduce this dye via interface with anions in organic media (THF, DMSO). A drastic modulation of their absorption and emission properties was noticed in solution (panchromatic UV-Vis-NIR and Quenching). The reduction processes was proposed to be a Single Electron Tranfer (SET) from anion to PBI. SET phenomenon was further facilitated by incorporation of electron-with drawing substituents in bay region. The reduced PBIs were regenerated through specific chemical inputs with high redox-potential like (Zr4+, Fe3+, etc.,). The anion/cation executed switching behaviour was fully established through EPR, apart from electrochemistry and spectroscopy (absorption and emission). The stablilty of EPR active anion radical state in TLC or colum chromatography, was explored for moleculary memory. The reversible and reconfigurable magnetic sequences were visualized in the form of a feedback loop, with EPR active outputs (µa), demonstrating a data storage feature with the “write–read–erase” function. The phenomenon of bi-stable behaviour “magnetic to non magnetic” presented in this study signify a promising asset for futuristic non-volatile memory. In this presentation, design, development, exploration of PBIs as materilas of choice with promising information storage capability will be discussed. In addition to this, their structural tuning and interation with anions will be throughly presented.