H-Bond donor parameters for cations

Parameters that provide a quantitative description of the free energy of interaction of cations with any H-bond acceptor in any solvent have been experimentally determined.


Contents S2
General Experimental Details S4

Standard Method for UV/vis Absorption Spectroscopy Titrations S5
Standard Method for NMR Spectroscopy Titrations S6

Standard Method for UV/vis Absorption Titrations
The values of K, eH and eH•G were then optimised to minimise the difference between the experimental and calculated values of A using an iterative VBA macro. In a small number of cases, only 50% saturation of the isotherm was reached, but the consistency in the fitted values of the bound extinction coefficients with experiments that did reach saturation provides confidence in the accuracy of the association constant (Table S1).

Standard Method for NMR Spectroscopy Titrations 5
Titrations were carried out on a BB 500 MHz spectrometerr, using standard titration protocols. 1 A 5 mL sample of the host was prepared at a known concentration (typically between 4 mM and 7 mM in MeCN (2), 4 mM and 7 mM in acetone (2), 0.1 mM and 5 mM in CHCl3 (2) and 0.10 mM and 1.5 mM in CCl4 (HBD). A 0.6 mL portion of this solution was removed and added to a NMR tube, and the NMR spectrum was recorded. The guest (3-

Titration Curves for Reichardt's dye (1) in
Graph S118. Binding isotherm for titration using 1:1 fitting program and accounting for a nonspecific interaction for titration of phosphine oxide against 4-phenylazophenol in acetonitrile. Graph S120. Binding isotherm for titration using 1:1 fitting program and accounting for a nonspecific interaction for titration of phosphine oxide against 4-nitrophenol in acetonitrile.    Graph S133. UV/vis spectra of titration of phosphine oxide with 4-nitrophenol in carbon tetrachloride.
Graph S134. Binding isotherm for titration using 1:1 fitting program and accounting for a nonspecific interaction for titration of phosphine oxide against 4-nitrophenol in carbon tetrachloride. Graph S135. UV/vis spectra of titration of phosphine oxide with 5-nitroindole in carbon tetrachloride.
Graph S136. Binding isotherm for titration using 1:1 fitting program for titration of phosphine oxide against 5-nitroindole in carbon tetrachloride.    Table S1. Association constants for the H-bonded complexes formed between 1 and 3-27 in the different solvents at 298 K. a Experimental results are the average of at least two titrations and errors are quoted at the 95% confidence limit.