Free Energy Change in Hydrophobic Interactions Involving a Polyelectrolyte and Ruthenium Tris(bipyridine). A Pulsed Laser Study

Anny Slama-Schwok, Joseph Rabani

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Comparison between the effects of inert salts on the distribution of Ru(bpy)32+ions around three negative polyelectrolyes, poly(styrenesulfonate) (PSS), poly(vinyl sulfate) (PVS), and poly(acrylate) (PAA), is reported. Much higher ion concentrations are required in order to remove Ru(bpy)32+from PSS, as compared to removal from a PVS or PAA. Attributing the difference between these systems to the effect of hydrophobic interactions in the PSS enables the calculation of the free energy change involved in the formation of Ru(bpy)32+-PSS. The results show a definite distinction between Ru(bpy)32+“inside” and “outside” the polymer, with no exchange during the lifetime of the excited state of the ruthenium tris (bipyridine), Ru(bpy)32+*. The Ru(bpy)32+ions are located more deeply “inside the PSS as compared with the PVS.

Original languageEnglish
Pages (from-to)764-768
Number of pages5
JournalMacromolecules
Volume21
Issue number3
DOIs
StatePublished - 1988

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