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The complexation abilities of cyclic or acyclic crown-type polyethers toward metal cations, ammonium (or alkylammonium) ion, and neutral molecules have attracted much attention during the last four decades because of their contributions to stereoselective complexation, cation transport, and enzyme chemistry. It is well-known that the cyclic polyethers such as 18-crown-6 show the excellent complexing ability and selectivity for the guest species with or without the charge. On the other hand, the complexation abilities of the acyclic polyethers are weaker because of their conformational freedom as well as much less effective complexation process. However, the complexing abilities of the dipodal type acyclic polyethers are improved remarkably when they have rigid aromatic donor end-groups at the both ends of the oligo(ethylene glycol) backbone. Among these, 1,13-bis-(8-quinolyl)-1,4,7,10,13-pentaoxatridecane (L) is representative and has already been extensively investigated for its complexation ability toward several cationic or neutral guests because L has the attractive characteristics forming the pseudo-cyclic complexes with guest species in a manner similar to 18-crown-6. However, the crystal structures reported for complexation between L and the guest species, especially organic guests, are still rare.

Synthesis, Structural Characterization, and Physical Properties of Alkylammonium Derivative Complex with Acyclic Crown Ether Analog