科研之友
微信
新浪微博
Facebook
分享链接
摘要
Three new unsymmetrical hydroxyl-functionalized donors H1-H3 closely related to hydroxymethyl-BEDT-TTF have been synthesised and characterised. Cyclic voltammetry studies showed that the compounds exhibit reversible two one-electron redox processes typical for BEDT-TTF derivatives. X-ray diffraction studies of H1 and H2 reveal pi-stacking interactions between pairs of donors that are organized into distinct H-bonded square motifs and DFT calculations indicate that the HOMO is located on the central 1,3-dithiole rings. Protection of the hydroxyl group with acetyl in 13 eliminates co-facial S center dot center dot center dot S interactions between the dimers to accommodate the bulkier side chains, but short edge-to-edge S center dot center dot center dot S contacts offer an alternative pathway for electron mobility. Chemical oxidation of H1 and HMET 2 with I-2 afforded single crystals of two 1 : 1 charge transfer salts, 18 and 19. The molecules pack as dimers with close pi-stacking interactions between pairs of radical cations whose crystal structures are further stabilized via an interplay of S center dot center dot center dot S and S center dot center dot center dot I contacts. Iodine-doped surface conducting polystyrene blend films of H3 deposited on a silica substrate exhibit quasiconducting properties, but afford no OFET response when fabricated into devices. Visible-NIR studies of a doped polystyrene blend film of H3 cast on a glass substrate show absorption bands at lambda = 950 and 3000 nm, consistent with mixed valence states due to the presence of charge-transfer species on the surface of the films.
- 出版日期2015
- 单位武汉纺织大学
