Collect. Czech. Chem. Commun. 1997, 62, 981-994

Hydrophilicity Quantification of Highly Hydrophobic Decadodecasil 3R

Marcel J. den Extera, Jacobus C. Jansena, Herman van Bekkuma, Arlette Zikánováb, Josef Dubskýb and Milan Kočiříkb

a Laboratory of Organic Chemistry and Catalysis, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
b J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, 182 23 Prague 8, Czech Republic


Sorption properties of the clathrasil Decadodecasil 3R (DD3R) have been investigated by measuring equilibrium sorption isotherms of water. The dependence of the adsorbed amount on the relative water pressure has been found almost invariant of temperature. This behaviour has been explained by a scarce population of hydrophilic sorption sites isolated sufficiently from each other and by a polymolecular adsorption on them. Such a behaviour is consistent with a simple BET model. Both the low concentration of hydrophilic sorption sites and their weak strength confirm the generally accepted assumption on weakly hydrophilic character of DD3R.

Keywords: Decadodecasil; Clathrasil, isotherm; Sorption of water; Heat of wetting; Hydrophilicity scale.