Frontispiece: Tailoring Valence Tautomerism by Using Redox Potentials: Studies on Ferrocene‐Based Triarylmethylium Dyes with Electron‐Poor Fluorenylium and Thioxanthylium Acceptors. Issue 42 (26th July 2021)

• Record Type: Journal Article
• Authors: Casper, Larissa A.; Linseis, Michael; Demeshko, Serhiy; Azarkh, Mykhailo; Drescher, Malte; Winter, Rainer F.
• Is Part Of: Chemistry. Volume 27:Issue 42(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-07-26
• Subjects: ferrocene -- magnetochemical switches -- Mößbauer spectroscopy -- tritylium dyes -- valence tautomerism; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.202184264
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract : Ferrocenyl‐substituted triarylmethylium dyes with electron‐poor fluorenylium or thioxanthylium substituents go (di)radical : Judicious choice of the aryl substituents renders the redox potentials for ferrocenyl oxidation and triarylmethylium reduction so similar as to allow 4 ‐Fc‐C6 H4 ‐C + Ar2 cations to equilibrate with their paramagnetic valence isomers 4 ‐FcC .+ ‐C6 H4 ‐C . Ar2 . These equilibria were studied by quantitative spin‐counting methods and by Mößbauer spectroscopy. Our studies revealed that the diradicals and one‐electron‐reduced complexes 4 ‐Fc‐C6 H4 ‐CC . Ar2 dimerize to sizable or nearly quantitative extents. For more information, see the Full Paper by F. Winter et al. on page 10854 ff.