کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5208098 | 1503012 | 2015 | 15 صفحه PDF | دانلود رایگان |

This review discusses some general aspects of the highly directional intermolecular interactions in organic solids, followed by an overview of Ï-conjugated systems exhibiting directional preference in the intermolecular connection and demonstrating enhanced energy and/or charge carrier transfer. As examples, “small” dyes and pigments, “intermediate-sized” N-heteroacenes, and “large” hydrogen-bonded oligomers are considered. In all of these systems the intermolecular interactions between polarized peripheries of the Ï-conjugated moieties ensure a preferential direction in the molecular packing. The most important among these interactions are hydrogen bonds (both strong and weak). As demonstrated recently, hydrogen bonding represents a dominant attractive force even for molecules with different polarization of the Ï-conjugated aromatic or heterocyclic moieties, considered to be the most favorable condition for “face-to-face” orientation (Ï-Ï stacking).The solid-state anisotropy, most likely, results from the nematic liquid-crystalline ordering of both thermotropic and lyotropic origin. Moreover, the unique efficiency of the exciton diffusion in the J-aggregates of dyes indicates significant potential of the nematic liquid-crystalline state itself for the design of organic semiconductors.
Journal: Progress in Polymer Science - Volume 43, April 2015, Pages 33-47