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Molecular Wires with Controllable π‐Delocalization Incorporating Redox‐Triggered π‐Conjugated Switching Units
Author(s) -
Nojo Wataru,
Tamaoki Hitomi,
Ishigaki Yusuke,
Katoono Ryo,
Fujiwara Kenshu,
Fukushima Takanori,
Suzuki Takanori
Publication year - 2019
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201800341
Subject(s) - delocalized electron , dication , molecular switch , redox , conjugated system , chemistry , dihedral angle , biphenyl , electron transfer , photochemistry , materials science , crystallography , molecule , inorganic chemistry , hydrogen bond , polymer , organic chemistry
A perfluorobiphenyl‐2,2′‐diyl dication and its corresponding dihydrophenanthrene‐type electron donor are interconvertible upon two‐electron transfer. Redox‐triggered C−C bond‐formation/cleavage caused a drastic change in the torsion angle of the biphenyl unit. Thus, π‐delocalization ON/OFF switching was observed as a change in the UV absorption upon electrolysis of the linearly extended analogue with two phenylethynyl groups. A further extended π‐system with a molecular length of ca. 3.5 nm, which has two switching units, was synthesized. Spectroelectrograms as well as voltammetric analyses showed that the two units act nearly simultaneously because of the very small inter‐unit electrostatic repulsion in the tetracationic state. Thus, the present pair is a promising candidate as a switching unit for “molecular wires” with controllable π‐delocalization, in which a higher ON/OFF ratio of delocalization could be realized by incorporating multiple switching units.