Abstract
An unsymmetrical calix[4]-bis-crown ether having both conventional crown-6 and dibenzocrown-6 rings in a fixed 1,3-alternate conformation was synthesized with good yield by the reaction of a monocyclic calix[4]crown-6 with dibenzodimesylate in the presence of cesium carbonate. The cesium ion selectivity among alkali metal ions increased compared to symmetrical calix[4]-bis-crown-6. The solid state structure of the ligand-cesium complex illustrates a 1:2 complex ratio. On the contrary, in solution, e.g., extraction equilibrium and 1 H NMR experiment gave a 1:1 complex ratio. From the result of the chemical shift change upon metal ion complex, the cesium ion seems to prefer the dibenzocrown loop to the conventional crown-6 ring.
| Original language | English |
|---|---|
| Pages (from-to) | 183-187 |
| Number of pages | 5 |
| Journal | Journal of Inclusion Phenomena |
| Volume | 40 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2001 Jul 1 |
| Externally published | Yes |
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Keywords
- Calix[4]-bis-crown
- Calixarene
- Complexation
- Crown ether
- Crystal structure
ASJC Scopus subject areas
- Chemistry(all)
- Condensed Matter Physics
Cite this
Cesium complex of an unsymmetrical calix[4]crown-dibenzocrown-6. / Kim, Jong Seung; Lee, Won Ku; Lee, Soo Heon; Kim, Jin Gyu; Suh, Il Hwan; Kim, Jong Yeol; Kim, Jong Wan.
In: Journal of Inclusion Phenomena, Vol. 40, No. 3, 01.07.2001, p. 183-187.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Cesium complex of an unsymmetrical calix[4]crown-dibenzocrown-6
AU - Kim, Jong Seung
AU - Lee, Won Ku
AU - Lee, Soo Heon
AU - Kim, Jin Gyu
AU - Suh, Il Hwan
AU - Kim, Jong Yeol
AU - Kim, Jong Wan
PY - 2001/7/1
Y1 - 2001/7/1
N2 - An unsymmetrical calix[4]-bis-crown ether having both conventional crown-6 and dibenzocrown-6 rings in a fixed 1,3-alternate conformation was synthesized with good yield by the reaction of a monocyclic calix[4]crown-6 with dibenzodimesylate in the presence of cesium carbonate. The cesium ion selectivity among alkali metal ions increased compared to symmetrical calix[4]-bis-crown-6. The solid state structure of the ligand-cesium complex illustrates a 1:2 complex ratio. On the contrary, in solution, e.g., extraction equilibrium and 1 H NMR experiment gave a 1:1 complex ratio. From the result of the chemical shift change upon metal ion complex, the cesium ion seems to prefer the dibenzocrown loop to the conventional crown-6 ring.
AB - An unsymmetrical calix[4]-bis-crown ether having both conventional crown-6 and dibenzocrown-6 rings in a fixed 1,3-alternate conformation was synthesized with good yield by the reaction of a monocyclic calix[4]crown-6 with dibenzodimesylate in the presence of cesium carbonate. The cesium ion selectivity among alkali metal ions increased compared to symmetrical calix[4]-bis-crown-6. The solid state structure of the ligand-cesium complex illustrates a 1:2 complex ratio. On the contrary, in solution, e.g., extraction equilibrium and 1 H NMR experiment gave a 1:1 complex ratio. From the result of the chemical shift change upon metal ion complex, the cesium ion seems to prefer the dibenzocrown loop to the conventional crown-6 ring.
KW - Calix[4]-bis-crown
KW - Calixarene
KW - Complexation
KW - Crown ether
KW - Crystal structure
UR - http://www.scopus.com/inward/record.url?scp=0345877084&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0345877084&partnerID=8YFLogxK
U2 - 10.1023/A:1011821612309
DO - 10.1023/A:1011821612309
M3 - Article
AN - SCOPUS:0345877084
VL - 40
SP - 183
EP - 187
JO - Journal of Inclusion Phenomena and Macrocyclic Chemistry
JF - Journal of Inclusion Phenomena and Macrocyclic Chemistry
SN - 1388-3127
IS - 3
ER -