Probing cucurbituril assemblies in water with TEMPO-like nitroxides: a trinitroxide supraradical with spin-spin interactions.
Nitroxide free radicals are demonstrated to be useful guests for probing cucurbit[n]uril (CB[n]) assemblies in water by EPR spectroscopy. CB[7] and CB[8] significantly aggregate either in solution or in the solid state (as evidenced by a single-crystal X-ray structure in which CB[8] forms supramolecular triangles with 4-methoxy-TEMPO). The included nitroxides show a striking resistance to biologically relevant reduction, benefiting from the carcerand effect of CB[7] and CB[8] solutions.
Bardelang
David
D
Laboratoire LCP, Universités d'Aix-Marseille I, II, III et CNRS, Avenue Escadrille Normandie-Niemen, 13 397 Marseille Cedex 20, France.
Banaszak
Karol
K
Karoui
Hakim
H
Rockenbauer
Antal
A
Waite
Mélanie
M
Udachin
Konstantin
K
Ripmeester
John A
JA
Ratcliffe
Christopher I
CI
Ouari
Olivier
O
Tordo
Paul
P