Fig. 2
From: Control over multiple molecular states with directional changes driven by molecular recognition
Studies of the Ag(I)-linked double-stranded helical complex. a–c Single-crystal X-ray structure of double helix comprised of 1, AgBF4, and a water molecule viewed from the front a, the side b, and the top c. d Partial structure illustrating the torsional angle between the two pyridine subunits (protons are omitted for clarity). e Job-plot analysis of the components, 1 and AgBF4, which combine to produce a helix with net 1 : 1 binding stoichiometry. f Binding isotherm analysis corresponding to the formation of a double-stranded complex from Ag(I) and 1. g Size comparison between 1 and the helix derived from it, as inferred from dynamic light scattering experiments. h Expanded 1H NMR spectra highlighting the minimal spectral changes induced when 1 is exposed to Ag(I). i Scanning electron microscopic image of the helix. The scale bar denotes 0.5 μm. j Cold spray ionization (CSI)–MS spectrum of the mixture of 1 + AgBF4. Shown here is a mass spectrum corresponding to the presumed trimeric complex, [13(AgBF4)3Ag]+
