title: Formation of metal-assisted stable double helices in dimers of cyclic bis-tetrapyrroles that exhibit spring-like motion.
abstract: Bidipyrrin-bridged macrocycles, prepared from Ni(II)-bridged dipyrrin-based nanorings by intramolecular oxidative biaryl coupling reactions, yielded [2+4]-type Zn(II)-assisted stable twisted-ring dimers comprising two double helices. These [2+4]-type metal complexes can be optically resolved by chiral HPLC and exhibit tunable electronic and optical properties as a result of spring-like motions. The double helices behave as glue to connect two macrocycles and as the screws of hinges to form thermally responsive synchronized spring systems.
authors: College of Pharmaceutical Sciences, Institute of Science and Engineering, Ritsumeikan University, Kusatsu 525-8577, Japan.
authors: Takashi
authors: T
authors: Hashimoto
authors: Takuma
authors: T
authors: Nishimura
authors: Jong Min
authors: JM
authors: Lim
authors: Dongho
authors: D
authors: Kim
authors: Hiromitsu
authors: H
authors: Maeda
mesh_terms: D056831:Coordination Complexes / Q000737:chemistry; D061565:Cycloaddition Reaction; D019281:Dimerization; D006571:Heterocyclic Compounds / Q000737:chemistry; D049329:Nanostructures / Q000737:chemistry; D045725:Tetrapyrroles / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
chemical_list: D056831:Coordination Complexes; D006571:Heterocyclic Compounds; D045725:Tetrapyrroles; D015032:Zinc