Cooperativity between cation, OH or Lewis acids, OH interactions and H-bonds or van der Waals forces

The polarisation of HOD monomers by different cations and solvents has been determined by an IR spectroscopic method in diluted solutions (1 : 100). H-bonds or van der Waals interactions of HOD can increase by 10 until 450% depending on the cation position in the Hofmeister or lyotropic ion series. The cause of this ion polarisation series is clarified as similar to the series of the Coulomb field strength.-Methanol measurements show the same cooperativity factors (cf.) as HOD within our error limits. Similar results were found with Lewis acids (L.a.)/methanol/solvents interacting with H- bonds as well as with van der Waals interactions. The series of L.a. of L.a.cfs. is at most only proportional to the Coulomb field strength of the cation parts in homologuous series. The cfs.of L. a. are relatively large and seem to correlate with the solvolyse /hydrolyse or with catalytic properties