Organic Donor-Acceptor Complexes As Potential Semiconducting Materials

In this review article, the synthesis, characterization and physico-chemical properties of the organic donor-acceptor complexes are highlighted and a special emphasis has been placed on developing them as semiconducting materials. The electron-rich molecules, i. e., donors have been broadly grouped in three categories, namely polycyclic aromatic hydrocarbons, nitrogen heterocycles and sulphur containing aromatic donors. The reactions of these classes of the donors with the acceptors, namely tetracyanoquinodimethane (TCNQ), tetracyanoethylene (TCNE), tetracyanobenzene (TCNB), benzoquinone, pyromellitic dianhydride and pyromellitic diimides, fullerenes, phenazine, benzothiadiazole, naphthalimide, DMAD, maleic anhydride, viologens and naphthalene diimide are described. The potential applications of the resulting DA complexes for physico-electronic purposes are also included. The theoretical investigation of many of these products with a view to rationalise their observed physico-chemical properties is also discussed. This article overviews the synthesis, characterization, and physico-chemical properties of the organic donor-acceptor complexes, often referred to as charge transfer complexes. Donors, categorized as polycyclic aromatic hydrocarbons, nitrogen heterocycles, and sulphur-containing aromatic compounds, are examined in their reactions with various acceptors like TCNQ, TCNE, fullerenes, and others. The article delves into applications of resulting complexes for physico-electronic purposes and includes theoretical investigations to rationalize the observed properties. image