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Macrocycles Containing Tin. Through Space Cooperative Binding and High Size Selectivity in the Complexation of Chloride Ion by Lewis Acidic Macrobicyclic Hosts.
TEXAS A AND M UNIV COLLEGE STATION DEPT OF CHEMISTRY
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The preparation of macrobicyclic hosts 1,8-dichloro-1,8-distannabicyclo eisocane 1a, 1,10-dichloro-10-distannabicyclo hexacosane 1b, 1,12-dichloro-1,12-distannabicyclo dotriacontane 1c and 1, 12-dichloro-1,12-distannabicyclo octatriacontane 1d are reported. Complexation of chloride ion in CDCl3 solutions by these hosts was studied by Sn-119 NMR spectroscopy, and kinetics and equilibrium constants for 1b-d were determined by line shape analysis. Selective chloride binding was observed hosts 1b and 1c bind chloride more strongly than does host 1d, and host 1a does not bind chloride. Keyswords Tin, Marcrocycle, Macrobicycle, Complexation, Size, Selective, Lewis acid, Chloride, Kinetics.
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