Title

Intramolecular (Electron) Delocalization Between Aromatic Donors and their Tethered Cation–Radicals. Application of Electrochemical and Structural Probes

Document Type

Article

Language

eng

Publication Date

2001

Publisher

Royal Society of Chemistry

Source Publication

Journal of the Chemical Society, Perkin Transactions 2

Source ISSN

1472-779X

Abstract

To study the mechanism of electronic transduction along (poly)phenylene chains, a series of aromatic donors with general formula D–B–D has been synthesized [where D = 2,5-dimethoxy-4-methylphenyl donor and B = (poly)phenylene bridge]; and the corresponding cation–radical salts D–B–D+˙ SbCl6 have been isolated for X-ray crystallographic analyses. The magnitude of the electronic interaction between the D and D+˙ moieties through the various B bridges has been measured (i) as the difference between the first and the second oxidation potentials of D–B–D donors and (ii) as the structural changes induced in neutral D by the presence of the tethered D+˙ group in D–B–D+˙ cation–radicals. The intramolecular interaction of D and D+˙ groups was found to occur via π-conjugation of the bridging (poly)phenylene group. As such, the electronic interaction is highly dependent on the planarity of the (poly)phenylene bridge, and can be either inhibited or promoted by the deliberate modifications of the molecular conformation. Crystal structures of compounds A, B, B+˙+˙, 1, 1+˙, 2, 2+˙, 3+˙, 8 and 9+˙ are reported.

Comments

Journal of the Chemical Society, Perkin Transactions 2, No. 9 (2001): 1585-1594. DOI.

Sergey V. Lindeman was affiliated with the University of Houston at the time of publication.

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