title: Nanoscale metal coordination macrocycles fabricated by using "dimeric" dipyrrins.
abstract: Covalently linked dipyrrin (dipyrromethene) dimers have afforded nanoscale [2+2]-type neutral coordination macrocycles with a diagonal of about 1.6 nm. Two moieties of the achiral dipyrrin-Zn(II) complex yield the chiral coordination macrocycles as minor species, as well as major meso stereoisomers by the covalent linkages. Tetrahedral Zn(II) coordination by using acyclic ligands enables the dipyrrin-metal complex units to readily rotate and pass through the cavity of the nanorings in order to reveal the transitions between the chiral and achiral isomers.
authors.affiliation: Department of Bioscience and Biotechnology, Faculty of Science and Engineering, Ritsumeikan University, Kusatsu 525-8577, Japan. maedahir@se.ritsumei.ac.jp
authors.forename: Hiromitsu
authors.initials: H
authors.lastname: Maeda
authors.forename: Takashi
authors.initials: T
authors.lastname: Hashimoto
mesh_terms: D019281:Dimerization; D008024:Ligands; D053768:Metal Nanoparticles / Q000737:chemistry*; D011162:Porphobilinogen / Q000031:analogs & derivatives* / Q000737:chemistry; D013237:Stereoisomerism; D015032:Zinc / Q000737:chemistry*
chemical_list: D008024:Ligands; C507544:dipyrromethene; D011162:Porphobilinogen; D015032:Zinc