Racemic single-walled carbon nanotubes exhibit circular dichroism when wrapped with DNA.
We have found that racemic mixtures of chiral single-walled nanotubes (SWNTs) wrapped with d(GT)20 DNA oligomer exhibit circular dichroism (CD). We attribute the CD signal to induced CD arising from the coupling of transition moments of the SWNTs and the DNA. Although the nanotube mixture appears to contain both enantiomers in equal amounts, DNA-SWNT transition moment interaction is more constructive for one SWNT enantiomer over the other, resulting in an overall CD signal.
Dukovic
Gordana
G
Department of Chemistry, Columbia University, New York, New York 10027, USA. gd2012@columbia.edu
Balaz
Milan
M
Doak
Peter
P
Berova
Nina D
ND
Zheng
Ming
M
McLean
Robert S
RS
Brus
Louis E
LE
D002942:Circular Dichroism; D004247:DNA / Q000737:chemistry*; D008968:Molecular Conformation; D037742:Nanotubes, Carbon / Q000737:chemistry*
D037742:Nanotubes, Carbon; D004247:DNA