title: Capturing C90 Isomers as CF3 Derivatives: C90 (30)(CF3)14, C90 (35)(CF3)16/18 , and C90 (45)(CF3)16/18.
abstract: High-temperature trifluoromethylation of a C90 isomeric mixture with CF3 I followed by HPLC separation of C90 (CF3)n isomers resulted in the isolation of several individual C90 (CF3)14-18 compounds. Single crystal X-ray diffraction with the use of synchrotron radiation resulted in the structure determination of C90 (30)(CF3)14 , C90 (35)(CF3)16/18 , and C90 (45)(CF3)16/18 . Their addition patterns are discussed and compared with the known isomers C90 (30)(CF3)18 and C90 (35)(CF3)14 , respectively. The presence of the most stable C90 isomer, C90 (45), in the fullerene soot has been confirmed for the first time.
authors.affiliation: Chemistry Department, Moscow State University, Leninskie gory, 119991, Moscow, Russia.
authors.forename: Nadezhda B
authors.initials: NB
authors.lastname: Tamm
authors.affiliation: Chemistry Department, Moscow State University, Leninskie gory, 119991, Moscow, Russia. stroyano@thermo.chem.msu.ru.
authors.forename: Sergey I
authors.initials: SI
authors.lastname: Troyanov
keywords: C90; HPLC; fullerenes; structure elucidation; trifluoromethylation