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Of Twists and Curves: Electronics, Photophysics, and Upcoming Applications of Non‐Planar Conjugated Organic Molecules
Author(s) -
Kumar Rajesh,
Aggarwal Himanshu,
Srivastava Aasheesh
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201905071
Subject(s) - planarity testing , conjugated system , intramolecular force , molecule , chemical physics , asymmetry , materials science , molecular electronics , organic electronics , planar , nanotechnology , chemistry , polymer , crystallography , computer science , physics , stereochemistry , transistor , voltage , organic chemistry , computer graphics (images) , quantum mechanics , composite material
Non‐planar conjugated organic molecules (NPCOMs) contain π‐conjugation across their length and also exhibit asymmetry in their conformation. In other words, certain molecular fragments in NPCOMs are either twisted or curved out of planarity. This conformational asymmetry in NPCOMs leads to non‐uniform charge‐distribution across the molecule, with important photophysical and electronic consequences such as altered thermodynamic stability, chemical reactivity, as well as materials properties. Majorly, NPCOMs can be classified as having either Fused or Rotatable architectures. NPCOMs have been the focus of significant scientific attention in the recent past due to their exciting photophysical behavior that includes intramolecular charge‐transfer (ICT), thermally activated delayed fluorescence (TADF) and long‐lived charge‐separated states. In addition, they also have many useful materials characteristics such as biradical character, semi‐conductivity, dynamic conformations, and mechanochromism. As a result, rational design of NPCOMs and mapping their structure‐property correlations has become imperative. Researchers have executed conformational changes in NPCOMs through a variety of external stimuli such as pH, temperature, anions‐cations, solvent, electric potential, and mechanical force in order to tailor their photophysical, optoelectronic and magnetic properties. Converging to these points, this review highlights the lucrative electronic features, photophysical traits and upcoming applications of NPCOMs by a selective survey of the recent scientific literature.