INOR 884 |
| A series of novel ‘open-chain' oligobipyridine ligands linked by pseudo-crown-ethers have been synthesized and have been shown to be excellent host molecules for small cationic guests. The ion-pair complexes that result follow the interesting ‘same-fit' concept for the ether pocket size of the host and the ionic radii of the guest. When the peripheral bipyridine units are metallated with the appropriate transition metal centers, these flexible complexes form either monometallic macrocycles or bimetallic pseudo-macrocycle complexes. Upon coordination, the ion-binding selectivity and efficiency of these complexes do change relative to the uncoordinated ligands. The more flexible bimetallic systems are less selective, while the fixed-pocket monometallic systems maintain their ion preferences. The bimetallic host systems are of considerable interest for their ability to bind a number of size variant cationic guests and the possible stripping mechanism that results from forcing the complex into an ‘open-form'.
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General Inorganic Chemistry
1:30 PM-5:20 PM, Wednesday, August 22, 2007 BCEC -- 212, Oral
Division of Inorganic Chemistry |
