Fig. 5. PXRD patterns and XPS spectrum of re-intercalated PTI structures. (a) Experimental PXRD pattern of PTI·LiBr and RI-PTI·LiBr, showing an exact overlap between the two datasets. (b) PXRD pattern of PTI·LiCl and RI-PTI·LiCl, showing a clear overlap between data obtained for material synthesised via the molten salt route and that produced by re-intercalation from IF-PTI. (c) The PXRD pattern obtained from re-intercalated PTI·HCl overlaid with reported peak intensities and positions from previous materials obtained via high-P,T synthesis. (d) XPS survey scan of our RI-PTI·HCl phase, showing an increase in intercalated Cl content.