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.