Supporting Information Kinetics of Formation of the Host-Guest Complex of a Viologen with Cucurbit[7]uril

EXPERIMENTAL DETAILS Chemicals and solutions. Ion exchanged and MILLIPORE ultrafiltered (Milli-Q synthesis A10) water was used to prepare all solutions. Aceta te buffers (pH = 4.5) were made from NaOAc and HClO4. An Orion Sure-Flow Ross combined-pH electrode att ached to an Orion Expandable Ion Analyzer E920 was employed for the p H measurements. The electrode was calibrated following IUPAC recommendations. For UVvis absorbance measurements an HP8452A diode array photometer and a cell with 1.00 cm path length were used.