Use of an interactive carbohydrate polymer phenomenon for the separation of polyoxometalates

Exploring the mobility of nanoscale polyoxometalates using gel electrophoresis

“…This is presumably because the POMs have associated with some of the sugar-based components of the gel matrix via hydrogen bonding and/or direct displacement of the metal oxo-ligands by the abundant alkoxy groups. 14 The IR spectrum of the {Mo 132 } precipitate prepared by extraction method A followed by addition of acetone gave a similar spectrum to that of the preloaded {Mo 132 } but with additional peaks corresponding to agarose, confirming the association of the agarose and POM. Samples of {Mo 154 } and {Mo 132 } precipitated after electrophoresis were obtained by extraction method B followed by addition of dimethylstearylammonium bromide and acetone and KCl and acetone respectively.…”

“…These attractive interactions could be attributed to hydrogen bonding between the oxo-ligands of the POM and the hydroxyl groups of the agarose; such interactions between sugar-based polymer matrices and POMs have been previously reported. 14 These interactions would account for the linearity of the relationships observed in the absence of molecular sieving effects since compounds with lower surface charge densities would form weaker hydrogen bond interactions with the gel and thus have lower mobilities as seen here.…”

A multitechnique study of the interactions between H+, Na+, Ca2+ and Cu2+, and two types of softwood Kraft fibre materials

“…Indications of this phenomenon has previously been reported (e.g. [8,27]), but in the present work has for the first time the correlation between ionic strength and the shortcoming of the Donnan model been systematically studied. The results show upon two predominant types of metal ion-fibre interactions, namely unspecific Donnan interactions and the formation of specific chemical surface complexes.…”