Metal-assisted assembly of pyridine-containing arylene ethynylene strands to enantiopure double helicates.
Pyridine-containing arylene ethynylene strands were connected to the 2- and 2'-positions of (R)- and (S)-1,1'-binaphthyl templates. The arylene ethynylene moieties underwent intramolecular coordination with Ag(I) or Cu(I) ion to afford enantiopure double helicates. The double-helical structure was elucidated on the basis of circular dichroic (CD) spectra. The importance of intramolecular complexation of the double strands for the helicate formation was confirmed by comparison with a ligand bearing a single strand. Connection of the strands through an ether linkage enabled a sorting out of the Cotton effect induced by double-helical arylene ethynylene moieties. The CD exciton chirality method unambiguously proved that the termini of the strands approach each other upon complexation and that the sense of the induced helicity is the same as predicted by molecular modeling.
Orita
Akihiro
A
Contribution from the Departments of Applied Chemistry and Chemistry, Okayama University of Science, Ridai-cho, Okayama 700-0005, Japan.
Nakano
Takehiro
T
An
De Lie
DL
Tanikawa
Kazumi
K
Wakamatsu
Kan
K
Otera
Junzo
J