Complexation of Pyridino-Azacrown Ethers with Alkali Metal Ions in N,N-Dimethylformamide 


Vol. 36,  No. 5, pp. 669-673, Oct.  1992


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  Abstract

알칼리금속이온(Li+, Na+, K+, Rb+, and Cs+)과 아미드기를 포함하는 피리디노아자 크라운 화합물인 DBPDA와 PDA의 착물형성에 대한 안정도상수, K를 전기 전도도법을 이용하여 여러 온도에서 측정하였다. 각 온도에서 K값은 DBPDA의 경우 Cs+ > K+ > Rb+ > Li+ > Na+의 순서였으며, PDA의 경우는 Cs+ > K+ > Rb+ > Li+ > Na+이었다. 또한 DBPDA가 PDA보다 이들 알칼리 금속 이온에서 더 큰 K값을 보여주었다. 넓은 의미를 갖는 "Hole-Size-Selectivity" 원리에 이들 착물은 적용되지 않는 것으로 나타났다. 온도 변화에 따른 K값으로부터 △H와 T△S를 각각 구했으며, 이들 반응들은 엔탈피 기여에 따르는 착물형성반응으로 나타났다. 그러나 PDA의 경우 부분적인 엔트로피 항의 증가도 착물의 형성에 기여함을 알았다. The stability constants, K for the complexation of alkali metal cations(Li+, Na+, K+, Rb+, and Cs+) with both 4,5: 13,14-dibenzo-6,9,12-triaza-bicyclo [15,3,1] heneicosa-1 (21),7,19-trioxa-2,16-dione (DBPDA) and 6,9,12-trioxa-3,15,21-triaza bicyclo [15,3,1] heneicosa-1 (21),17,19-triene-2,16-dione (PDA) in N,N-Dimethylformamide (DMF) were determined conductomatically at various temperatures. At all the experiment temperatures, the K value sequences of the alkali metal ions with DBPDA and PDA are Cs+ > K+ > Rb+ > Li+ > Na+ and Cs+ > K+ > Rb+ > Li+ > Na+, respectively. The K values for DBPDA are larger those of PDA for alkali metal ions. The widely recounted "hole-size-selectivity" principle is not applicable to these complexation systems. From the K values obtained at different temperatures, △H and T△S for these complexation reactions were determined. The enthalpy change plays principal important role in the complex formation by DBPDA. However, in the case of PDA, the entropy change also contributes to its complex formation.

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  Cite this article

[IEEE Style]

D. W. Kim, Y. Shin, C. S. Kim, J. J. Oh, Y. S. Jeon, T. S. Kim, "Complexation of Pyridino-Azacrown Ethers with Alkali Metal Ions in N,N-Dimethylformamide," Journal of the Korean Chemical Society, vol. 36, no. 5, pp. 669-673, 1992. DOI: .

[ACM Style]

Dong Won Kim, Young-Kook Shin, Chang Suk Kim, Je Jik Oh, Young Shin Jeon, and Tae Seung Kim. 1992. Complexation of Pyridino-Azacrown Ethers with Alkali Metal Ions in N,N-Dimethylformamide. Journal of the Korean Chemical Society, 36, 5, (1992), 669-673. DOI: .

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ISSN(Print) 1017-2548
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