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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 37, Number 5
JKCSEZ 37(5)
October 20, 1993 

 
Title
Binding Properties of Alkali Metal Ions with DBPDA Ion Exchanger

알칼리 금속이온들과 DBPDA 이온교환체와의 결합특
Author
Dong Won Kim, Chang Suk Kim, Ki Young Choi, Young Shin Jeon

김동원, 김창석, 최기영, 전영신
Keywords
Abstract
고분자물질로 지지된 아자크라운 에테르(polymer supported azacrown ether:DBPDA ion exchanger)를 합성하고, 이 이온교환체와 Li, Na, 그리고 K의 피크레이트염과의 이온결합등에 대하여 알아보았다. 그리고, DBPDA 이온교환체와 알칼리 피크린산염의 에테르형 용매내에서 알칼리 금속이온들의 결합상수(binding constant:Kb)를 분광광도법을 통하여 구하였다. 그 결과, 결합상수의 크기는 Li < Na < K 순으로 증가하였으며, 리간드와 1:1 착물을 형성한다는 것을 알 수 있었다. 또한 이들의 Kb값들은 용매 및 온도 등과 같은 것들에 의하여 변화하였으며, 그 값들은 2 × 103 ∼ 4 × 104 M-1 범위내에 있었다. 한편 이들 착물형성 과정에서의 엔탈피 및 엔트로피 변화, △H 및 △S는 10~40℃ 온도 범위내에서 van't Hoff plot으로부터 구했으며, 이들의 값들은 각각, -2.71∼-3.79 kcal/mol과 -16.52∼-20.57 eu 범위내에 있었다.

Synthesis of polymer-supported azacrown ether ion exchanger, {(4,5): (13,14)-dibenzo-6,9,12-trioxa-3,15,21-triazazabicyclo[15.3.1]heneicosa-1(21),17,19-triene-2,16-dione : DBPDA ion exchanger}, and its ion binding ability to alkali metal (Li+, Na+, K+) picrates were studied. The binding constants (Kb) of DBPDA ion exchanger to the alkali metal picrates in ether type solvents were obtained by spectrophotometry. Binding constants of alkali metal ions were in the order to Li < Na < K, and alkali metal ions were formed 1 : 1 complexes with ligands of DBPDA ion exchanger. Also, Kb was found to depend on the variables such as solvent and temperature. The binding constants for the complexes were obtained in the ranges of 2 × 103 ∼ 4 × 104 M-1. In order to obtain the enthalpy (△H) and entropy changes (△S) in the complexation process, Kb were plotted against the temperature in the ranges of 10∼40℃ according to the van't Hoff theory. Enthalphy and entropy changes were found in the ranges of -2.71∼-3.79 kcal/mol, and -16.52∼-20.57 eu, respectively.

Page
491 - 495
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