title: Vaporization-condensation-recrystallization process-mediated synthesis of helical m-aminobenzoic acid nanobelts.
abstract: One-dimensional (1D) helical organic nanostructures were synthesized by a modified vapor-solid (VS) process, called the vaporization-condensation-recrystallization (VCR) process. The conventional solution-phase synthetic methods generally mediate self-assemblies of repeating unit molecules. To provide enough intermolecular interaction forces among the unit molecules, such strategy requires specific designs and syntheses of complex unit molecules as they possess numerous functional groups including phenyl rings, hydroxyl groups, long aliphatic chains, etc. On the contrary, we found that small and simple organic molecules, for example, m-ABA, could be self-assembled by the VCR process, resulting in 1D helical organic nanostructures. When m-aminobenzoic acid (m-ABA) powders were vaporized and transported to be condensed on a cooler region, the condensates were recrystallized into 1D helical nanobelts. Each step of the VCR process was confirmed from control experiments performed by varying reaction times, substrate types, and reaction temperatures. Powder XRD data, SAED analysis, and theoretical calculations revealed that dimers of m-ABA molecules have repeating units, and the growth axis of m-ABA nanohelices is [100].
authors.affiliation: Department of Chemistry, Pohang University of Science and Technology, San 31, Hyoja-Dong, Nam-Gu, Pohang 790-784, Korea.
authors.forename: Seok Min
authors.initials: SM
authors.lastname: Yoon
authors.forename: In-Chul
authors.initials: IC
authors.lastname: Hwang
authors.forename: Namsoo
authors.initials: N
authors.lastname: Shin
authors.forename: Docheon
authors.initials: D
authors.lastname: Ahn
authors.forename: Sang Joo
authors.initials: SJ
authors.lastname: Lee
authors.forename: Jin Yong
authors.initials: JY
authors.lastname: Lee
authors.forename: Hee Cheul
authors.initials: HC
authors.lastname: Choi
mesh_terms: D000465:Algorithms; D062365:Aminobenzoates / Q000138:chemical synthesis*; D003460:Crystallization; D019281:Dimerization; D046529:Microscopy, Electron, Transmission; D008962:Models, Theoretical; D015394:Molecular Structure; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D053838:Scattering, Small Angle; D013499:Surface Properties; D013696:Temperature; D014835:Volatilization; D014961:X-Ray Diffraction; D062368:meta-Aminobenzoates
chemical_list: D062365:Aminobenzoates; D062368:meta-Aminobenzoates; C044855:3-aminobenzoic acid