Molecular rotors: design, synthesis, structural analysis, and silver complex of new [7.7]cyclophanes.
New molecular rotors, [7.7](2,6)pyridinocyclophanes (monomers and dimers) embedding 1,3-dioxanes in the bridges, were investigated by variable-temperature NMR, molecular modeling, and single-crystal X-ray diffractometry. The nitrogen-inside rotation of the pyridine ring is more hindered in the derivatives with longer distance between the bridges (i.e., para > meta and 2,6-pyridylene > ortho) and can be chemically stopped by complexation with CF(3)SO(3)Ag. [structure: see text]
Bogdan
Niculina
N
Babes-Bolyai University, Faculty of Chemistry and Chemical Engineering, 11 Arany Janos str., 400028 Cluj-Napoca, Romania.
Grosu
Ion
I
Benoît
Guillaume
G
Toupet
Loïc
L
Ramondenc
Yvan
Y
Condamine
Eric
E
Silaghi-Dumitrescu
Ioan
I
Plé
Gérard
G