title: Thienoacene-fused pentalenes: syntheses, structures, physical properties and applications for organic field-effect transistors.
abstract: Three soluble and stable thienoacene-fused pentalene derivatives (1-3) with different π-conjugation lengths were synthesized. X-ray crystallographic analysis and density functional theory (DFT) calculations revealed their unique geometric and electronic structures due to the interaction between the aromatic thienoacene units and antiaromatic pentalene moiety. As a result, they all possess a small energy gap and show amphoteric redox behaviour. Time dependent (TD) DFT calculations were used to explain their unique electronic absorption spectra. These new compounds exhibited good thermal stability and ordered packing in solid state and thus their applications in organic field-effect transistors (OFETs) were also investigated. The highest field-effect hole mobility of 0.016, 0.036 and 0.001 cm(2)  V(-1)  s(-1) was achieved for solution-processed thin films of 1-3, respectively.
authors.affiliation: Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 (Singapore).
authors.forename: Gaole
authors.initials: G
authors.lastname: Dai
authors.forename: Jingjing
authors.initials: J
authors.lastname: Chang
authors.forename: Xueliang
authors.initials: X
authors.lastname: Shi
authors.forename: Wenhua
authors.initials: W
authors.lastname: Zhang
authors.forename: Bin
authors.initials: B
authors.lastname: Zheng
authors.forename: Kuo-Wei
authors.initials: KW
authors.lastname: Huang
authors.forename: Chunyan
authors.initials: C
authors.lastname: Chi
keywords: field-effect transistors; pentalene; pi-conjugated systems; semiconductors; thienoacene