Abstract
The stability constants (β1NB(M)/mol-1 dm3) of 1:1 complexes of M+ (=Li+, Na+) with 1,3-bis(8-quinolyloxy)propane (IV), 1,4-bis(8-quinolyloxy)butane (V) and 3,3-bis[(7-methyl-8-quinolyloxy)methyl]oxetane (VI) were determined by ion-transfer polarography in water-saturated nitrobenzene (NB) at 25° C. Their logarithmic values were on the order of VI (4.6)< V (5.7)<IV (7.4) for M=Li and VI (3.9)< V (4.5)<IV (5.7) for M=Na. This order shows that the stability of the Li+ and Na+ complexes significantly increases when the carrier can form a four-coordinate structure similar to that of a tetradentate 14-crown-4 in their complexes. The potentiometric selectivity coefficients (kLiNapot) of IV -VI for Li+ against Na+ were calculated based on the β1NB(M)-values using the equation log kLiNapot=0.70+logβ1NB(Na)/β1NB(Li)], and the results compared with those previously described for other bis(8-quinolyloxy)propane derivatives.
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Kudo, Y., Miyakawa, T., Takeda, Y. et al. Structural Effect of Several Acyclic Neutral Carriers Containing 8-Quinolyloxy Units on the Stability Constants of Their Li+ Complexes in Water-Saturated Nitrobenzene. ANAL. SCI. 10, 375–378 (1994). https://doi.org/10.2116/analsci.10.375
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DOI: https://doi.org/10.2116/analsci.10.375