Temporary and Permanent
Trapping of the Metastable
Twisted Conformer of an Overcrowded Chromic Alkene via Encapsulation
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Abstract
An overcrowded alkene with an anti-folded conformation
was converted
to its twisted conformer, accompanied by a dramatic color change from
yellow to deep purple, by inclusion in a self-assembled <i>T</i><sub><i>d</i></sub>-symmetric coordination cage. The shape
of the caged cavity was suitable and desirable for trapping of the
twisted conformer. The twisted conformation was temporarily memorized
in the alkene even after guest ejection. Permanent trapping of the
twisted conformation was achieved by bromination of the twisted conformer
formed in situ in the cage