English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

The properties as well as solid‐state structures, singlet fission, and organic field‐effect transistor (OFET) performance of three tetrafluoropentacenes (1,4,8,11:  10 , 1,4,9,10:  11 , 2,3,9,10:  12 ) are compared herein. The novel compounds  10  and  11  were synthesized in high purity from the corresponding 6,13‐etheno‐bridged precursors by reaction with dimethyl 1,2,4,5‐tetrazine‐3,6‐dicarboxylate at elevated temperatures. Although most of the molecular properties of the compounds are similar, their chemical reactivity and crystal structures differ considerably. Isomer  10  undergoes the orbital symmetry forbidden thermal [4+4] dimerization, whereas  11  and  12  are much less reactive. The isomers  11  and  12  crystallize in a herringbone motif, but  10  prefers π–π stacking. Although the energy of the first electric dipole‐allowed optical transition varies only within 370 cm −1  (0.05 eV) for the neutral compounds, this amounts to roughly 1600 cm −1  (0.20 eV) for radical cations and 1300 cm −1  (0.16 eV) for dications. Transient spectroscopy of films of  11  and  12  reveals singlet‐fission time constants (91±11, 73±3 fs, respectively) that are shorter than for pentacene (112±9 fs). OFET devices constructed from  11  and  12  show close to ideal thin‐film transistor (TFT) characteristics with electron mobilities of 2×10 −3  and 6×10 −2  cm 2  V −1  s −1 , respectively.

Modulating the Electronic and Solid‐State Structure of Organic Semiconductors by Site‐Specific Substitution: The Case of Tetrafluoropentacenes