title: Construction of double-stranded metallosupramolecular polymers with a controlled helicity by combination of salt bridges and metal coordination.
abstract: We describe the construction of the first double-stranded metallosupramolecular helical polymers. We designed and synthesized a supramolecular duplex comprised of complementary m-terphenyl-based strands bearing a chiral amidine or achiral carboxylic acid together with two pyridine groups at the four ends. Supramolecular polymerization of the duplex with cis-PtPh2(DMSO)2 in 1,1,2,2-tetrachloroethane produced the double-stranded metallosupramolecular polymer with a controlled helicity of which the two complementary metallostrands are intertwined through the amidinium-carboxylate salt bridges. The structures and hydrodynamic dimensions of the metallosupramolecular polymers were characterized by 1H NMR, diffusion-ordered NMR, dynamic light scattering, absorption, and CD measurements. The polymeric structure was also visualized by atomic force microscopy.
authors.affiliation: Yashima Super-structured Helix Project, ERATO, Japan Science and Technology Agency (JST), 101 Creation Core Nagoya, 2266-22 Moriyama-ku, Nagoya 463-0003, Japan.
authors.forename: Masato
authors.initials: M
authors.lastname: Ikeda
authors.forename: Yoshie
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Takashi
authors.initials: T
authors.lastname: Hasegawa
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Furusho
authors.forename: Eiji
authors.initials: E
authors.lastname: Yashima
mesh_terms: D002625:Chemistry, Organic / Q000379:methods*; D009682:Magnetic Resonance Spectroscopy; D008670:Metals / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D015394:Molecular Structure; D017671:Platinum Compounds / Q000737:chemistry; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry; D012492:Salts
chemical_list: D008670:Metals; D017671:Platinum Compounds; D011108:Polymers; D011725:Pyridines; D012492:Salts