title: Improved selectivity in discriminating handedness and diameter of single-walled carbon nanotubes with N-substituted 3,6-carbazolylene-bridged chiral diporphyrin nanotweezers.
abstract: Chiral diporphyrin nanotweezers 1 consisting of two chiral porphyrins with N-substituted 3,6-carbazolylene in between have been studied for the separation of single-walled carbon nanotubes (SWNTs). As compared to the analogous nanotweezers 2 without an N-substitutent, nanotweezers 1 with the N-octylcarbazolylene spacer exhibit much higher extraction ability and better selectivity for SWNTs. A narrower diameter range of SWNTs, from 0.88 to 0.92 nm, was selectively extracted with nanotweezers 1. In addition, only (7,6)-SWNTs of 0.90 nm diameter were optically enriched through extraction with 1, while SWNTs extracted with 2 showed lower optical purity of (7,6)-SWNTs. These enhanced extraction and discrimination abilities of 1 can be attributed to the formation of a more stable SWNT complex of 1 than of 2 in methanol.
authors.affiliation: Department of Chemistry, Shiga University of Medical Science, Seta, Otsu 520-2192, Japan.
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.forename: Kazunari
authors.initials: K
authors.lastname: Matsuda
authors.forename: A F M Mustafizur
authors.initials: AF
authors.lastname: Rahman
authors.forename: Takahide
authors.initials: T
authors.lastname: Kimura
authors.forename: Naoki
authors.initials: N
authors.lastname: Komatsu
mesh_terms: D002227:Carbazoles / Q000737:chemistry*; D002942:Circular Dichroism; D018625:Microscopy, Atomic Force; D037742:Nanotubes, Carbon / Q000737:chemistry*; D011166:Porphyrins / Q000737:chemistry*; D013053:Spectrophotometry; D013237:Stereoisomerism
chemical_list: D002227:Carbazoles; D037742:Nanotubes, Carbon; D011166:Porphyrins; C041514:carbazole