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A compact tetrathiafulvalene-benzothiadiazole dyad and its highly symmetrical charge-transfer salt: Ordered donor p-stacks closely bound to their acceptors
Geng, Yan; Pfattner, Raphael; Campos García, Antonio; Hauser, Jürg; Laukhin, Vladimir N.; Puigdollers i González, Joaquim; Veciana Miró, Jaume; Mas Torrent, Marta; Rovira Angulo, Concepció; Decurtins, Silvio; Liu, Shixia
Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. MNT - Grup de Recerca en Micro i Nanotecnologies
A compact and planar donor-acceptor molecule 1 comprising tetrathiafulvalene (TTF) and benzothiadiazole (BTD) units has been synthesised and experimentally characterised by structural, optical, and electrochemical methods. Solution-processed and thermally evaporated thin films of 1 have also been explored as active materials in organic field-effect transistors (OFETs). For these devices, hole field-effect mobilities of µFE=(1. 3±0.5)×10-3 and (2.7±0.4)×10-3 cm2 V s-1 were determined for the solution-processed and thermally evaporated thin films, respectively. An intense intramolecular charge-transfer (ICT) transition at around 495 nm dominates the optical absorption spectrum of the neutral dyad, which also shows a weak emission from its ICT state. The iodine-induced oxidation of 1 leads to a partially oxidised crystalline charge-transfer (CT) salt {(1)2I3}, and eventually also to a fully oxidised compound {1I3} 1/2I2. Single crystals of the former CT compound, exhibiting a highly symmetrical crystal structure, reveal a fairly good room temperature electrical conductivity of the order of 2 S cm-1. The one-dimensional spin system bears compactly bonded BTD acceptors (spatial localisation of the LUMO) along its ridge. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria química
Charge transfer
Electric conductivity
Charge transfer
Donor-acceptor systems
Electrical conductivity
Organic field-effect transistor
Transferència de càrrega
Conductivitat elèctrica
Attribution-NonCommercial-NoDerivs 3.0 Spain

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