Medium Diradical Character, Small Hole and Electron Reorganization Energies and Ambipolar Transistors in Difluorenoheteroles2022 · 記述言語: 英語 掲載種別: 研究論文(学術雑誌) 出版者・発行元: Angewandte Chemie - International Edition Four difluorenoheteroles having a central quinoidal core with the heteroring varying as furan, thiophene, its dioxide derivative and pyrrole have shown to be medium character diradicals. Solid-state structures, optical, photophysical, magnetic, and electrochemical properties have been discussed in terms of diradical character, variation of aromatic character and captodative effects (electron affinity). Organic field-effect transistors (OFETs) have been prepared, showing balanced hole and electron mobilities of the order of 10−3 cm2 V−1 s−1 or ambipolar charge transport which is first inferred from their redox amphoterism. Quantum chemical calculations show that the electrical behavior is originated from the medium diradical character which produces similar reorganization energies for hole and electron transports. The vision of a diradical as simultaneously bearing pseudo-hole and pseudo-electron defects might justify the reduced values of reorganization energies for both regimes. Structure-function relationships between diradical and ambipolar electrical behavior are revealed. DOI: 10.1002/anie.202206680 Scopus その他リンク: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85133513036&origin=inward
A double-helical S,C-bridged tetraphenyl-para-phenylenediamine and its persistent radical cation2022 · 記述言語: 英語 掲載種別: 研究論文(学術雑誌) 出版者・発行元: Chemical Communications A structurally constrained, double-helical S,C-bridged tetraphenyl-para-phenylenediamine (TPPD) has been synthesized. The stable radical cation of the S,C-bridged TPPD was generated by chemical oxidation, and the electron spin was found to be delocalized over the entire π-conjugated framework. The excellent conformational stability of the neutral molecule facilitated the separation of its enantiomers. DOI: 10.1039/d2cc06144a Scopus その他リンク: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85146282675&origin=inward