In 2022,Cheng, Guoqing; Hayashi, Takuya; Miyake, Yuya; Sato, Takashi; Tabata, Hiroshi; Katayama, Mitsuhiro; Komatsu, Naoki published an article in ACS Nano. The title of the article was 《Interlocking of Single-Walled Carbon Nanotubes with Metal-Tethered Tetragonal Nanobrackets to Enrich a Few Hundredths of a Nanometer Range in Their Diameters》.Formula: C14H8Br2 The author mentioned the following in the article:
The authors have separated C nanotubes through host-guest complexation using host mols. named nanotweezers and nanocalipers. A host mol. named tetragonal M-nanobrackets, consisting of a pair of dipyrrin nanocalipers corresponding to two brackets and tethered by two metals (M), is designed, synthesized, and employed to sep. single-walled C nanotubes (SWNTs). A facile three-step process including 1-pot Suzuki coupling is developed to prepare M-nanobrackets in a 37% total yield (M = Cu). Upon extraction of SWNTs with a square nanobracket and Cu(II), in situ formed tetragonal M-nanobrackets interlock SWNTs to disperse them in iso-PrOH. Interlocking is confirmed by absorption and Raman spectroscopy as well as transmission electron and at. force microscopy. Especially, Raman spectroscopy was used to prove the interlocking of SWNTs; Cu-nanobrackets inherent resonance Raman signals and affect the SWNT signals, or a radial breathing vibration, due to the rigid rectangular structure of Cu-nanobrackets. The interlocking is facilely and thoroughly released through demetalation to recover pristine SWNTs and the square nanobracket. Such chem. controlled locking and unlocking for SWNTs are one of the characteristics of the authors’ separation process. This enables a precise evaluation by Raman, photoluminescence, and absorption spectroscopy of the diameter selectivity to SWNTs, revealing the diameter enrichment of only three kinds of SWNTs, (7,6), (9,4), and (8,5), in the 0.02 nm diameter range from 0.90 to 0.92 nm among ~20 kinds of SWNTs from 0.76 to 1.17 nm in their diameter range.9,10-Dibromoanthracene(cas: 523-27-3Formula: C14H8Br2) was used in this study.
9,10-Dibromoanthracene(cas: 523-27-3) can be sublimated and oxidized to generate anthraquinone. Soluble in hot benzene and hot toluene, slightly soluble in alcohol, ether and cold benzene, insoluble in water.Formula: C14H8Br2
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary