Jahn–Teller distortion and merohedral disorder of C₆₀−· as observed by ESR

Titelangaben

Bietsch, W. ; Bao, Jianren ; Lüdecke, Jens ; van Smaalen, Sander:
Jahn–Teller distortion and merohedral disorder of C₆₀−· as observed by ESR.
In: Chemical Physics Letters. Bd. 324 (2000) Heft 1–3 . - S. 37-42.
ISSN 1873-4448
DOI: https://doi.org/10.1016/S0009-2614(00)00621-7

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Abstract

We used single crystals of A+(C6H5)42C60−·B− as an ideal model system to determine accurately principal values and principal axes of the g-tensor of the \{C60\} mono radical anion embeded in a crystal field. The experimentally observed non axial g-tensor which corresponds to the molecular Jahn–Teller distortion of C60− shows that the crystal field has stabilized the Jahn–Teller distortion of \{D2h\} symmetry along a specific molecular \{C2\} axis. These stabilization occurs below a characteristic temperature Ts for two C60−· orientations (merohedral disorder) and depends on the cations as we could show by the substitution of P+ for As+.