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Preparation and Physicochemical Properties of Organic Semiconducting Materials from the Reaction of Imidazo[1,2-a]pyridines with Tetracyanoethylene
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  • Chandani Mathur,
  • Raakhi Gupta,
  • Raj Bansal,
  • Sonia Swami,
  • Ankita Sheoran,
  • Deepak Salunke
Chandani Mathur
The IIS University
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Raakhi Gupta
The IIS University
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Raj Bansal
The IIS University

Corresponding Author:[email protected]

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Sonia Swami
The IIS University
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Ankita Sheoran
The IIS University
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Deepak Salunke
Panjab University
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Abstract

Organic Donor Acceptor (DA) complexes have emerged in recent years as materials of choice for the organic binary electronics. The reactivity de-scriptors derived from the conceptual DFT reveal imidazo[1,2-a]pyridines as potential donors. In view of this, four imidazo[1,2-a]pyridines reacted with tetracyanoethylene (TCNE) in 1:2 molar ratio to afford four new DA complexes. The spectral studies, namely IR, 1H, 13C, DEPT 135, 2D HMQC NMR, and HRMS were used to establish the structures. The UV-vis. spectroscopy reveals intramolecular charge transfer. All the four compounds fluoresce giving excitation emission fluorescence spectra with a red shift ranging from 64 to 151 nm and quantum yields from 0.004 to 16.35. Unexpectedly, nitro group in one of the products does not act as quencher; instead, it enhances the quantum yield to make it highest in this series. The products exhibit electrical conductivity which increases with temperature. The SEM and TEM images reveal distinct and homogenous surface morphology with holes which facilitate flow of electrons as manifested by electrical conductivity. The powder XRD and SAED results establish the polycrystalline nature of the products. The theoretical studies indicate an alternate donor acceptor stacking pattern.