Fig. 4: Structural characterization and non-colvant interaction analysis of TWGs and DWGs.

a 2D 1H-1H NOESY spectra of cis-cis-TWG1 and cis-trans-TWG1. (Arabic numerals and letters of the same color represent hydrogen protons located within the same 9-phenylfluorene unit.) b The single-crystal crystallography of cis-trans-TWG, cis-cis-TWG, meso-DWG1 and rac-DWG1. (The red and black lines represent phenyl at the same side or the other side, respectively). c The non-covalent interactions (NCI) isosurfaces for cis-trans-TWG1, cis-cis-TWG1, meso-DWG1 and rac-DWG1. d Plots of the reduced density gradient (RDG) of DWG1 and TWG1.