10.1021/ja901154p.s002 Guozan Yuan Guozan Yuan Chengfeng Zhu Chengfeng Zhu Yan Liu Yan Liu Weimin Xuan Weimin Xuan Yong Cui Yong Cui Anion-Driven Conformational Polymorphism in Homochiral Helical Coordination Polymers American Chemical Society 2009 aggregation behavior binding abilities GPC form sextuple helices Homochiral Helical Coordination PolymersThree homochiral 3 D frameworks 1 H NMR PF silver salts interaction ditopic ligand steric repulsions chiral framework UV cationic polymer skeleton exhibits counteranion chain conformation Ag 2009-08-05 00:00:00 Dataset https://acs.figshare.com/articles/dataset/Anion_Driven_Conformational_Polymorphism_in_Homochiral_Helical_Coordination_Polymers/2838790 Three homochiral 3D frameworks are assembled based on periodically ordered arrays of helices built from axial chiral 3,3′-bipyridine-5,5′,6,6′-tetramethyl-2,2′-dimethoxy-1,1′-biphenyl ligands and linearly coordinated Ag(I) ions. The aggregation behavior of silver salts and the ditopic ligand in solutions was investigated by a variety of techniques, including <sup>1</sup>H NMR, UV−vis, CD, GPC and MALDI-TOF. The cationic polymer skeleton exhibits an unprecedented conformational polymorphism in the solid-state, folding into two-, three- and four-fold helices with NO<sub>3</sub><sup>−</sup>, PF<sub>6</sub><sup>−</sup> and ClO<sub>4</sub><sup>−</sup> as the counteranion, respectively. The two-fold helices cross-link <i>via</i> argentophilic Ag−Ag interactions to form sextuple helices, which lead to a three-dimensional (3D) chiral framework. The three-fold or four-fold helices, on the other hand, self-associates in pairs to form three-dimensional tubular architectures. This anion-dependent self-assembly behavior can be rationalized by considering the sizes, geometries and binding abilities of the counteranions and subsequent chain conformation to minimize steric repulsions and maximize secondary interactions.