Ah&act-The conductance of aqueous solutions of [v-phenenyltris(oxyethylene)]tri8[triethylammonium] iodide and trimetaphosphate (SynI8 and SynP800) has been mea8ured at 25ยฐC. For SynI, negative deviation8 from the Onsager limiting law are observed, larger then the ones for IX&, La(NO3, or Na,P,O,. For SynP,O, negative deviation8 are alsO observed, but these are smaller than those for LaFe(CN)o or L&o&N),.
These results indicate that between the Syn*+ cation and the I-anion there is an interaction that is not entirely electrostatic in nature, and which is not present between Syn*+ and PIO18-. A donation of rr electron8 by the benzene ring to the Iion, or a hydrophobic bond between Syn*+ and I-, 8re suggested a8 possible causes of this interaction.
R&ram&La conductibilite de solutions aqueuses de iodure e de trimetaphosphate de [v-phenenyl-tri8(oxyetilene)]tri8]trietilammonium], (Syn It et Syn PgOp) a 6ttQ m&uree a 25ยฐC. Pour SynI, on a observe de8 deviation8 negative8 de la lois limite d'onsager, plus grandes que celles pour I&18, I.a(NO& ou Na&O,. On a obserVe de8 deviations negative8 pour Syn P80, aussi, mais en ce cas elles 8ont plus petite8 que celles pour LaFe(CN), ou LaCo(CN),. Ce8 rmultats montrent que entre le cation Syn*+ et l'anion I-il y a tme interaction qui n'est pa8 entierement de nature electrostatique, et qui n'e8t pa8 pr&ient entre Syna+ et P,O,*-. Les cause8 de cette interaction peuvent &tre ou le fait que le noyaux benzenique donne deux &ctrons a l'ion I-, ou une liaison hydrophobique entre le Syn*+ e le I-.