کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5212449 | 1383117 | 2017 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Tautomeric chromoionophores derived from 1-aryloxyanthraquinones and 4â²-aminobenzo-15-crown-5 ether: Sandwich complex formation enhanced by interchromophoric interactions Tautomeric chromoionophores derived from 1-aryloxyanthraquinones and 4â²-aminobenzo-15-crown-5 ether: Sandwich complex formation enhanced by interchromophoric interactions](/preview/png/5212449.png)
A series of tautomeric chromoionophores were prepared photochemically from 1-aryloxyanthraquinones and 4â²-aminobenzo-15-crown-5 ether. All the synthesized dyes can bind strontium and barium cations as sandwich-type 2:1 ligand-metal complexes that show higher stability constants (K2:1) than the corresponding 1:1 complexes (K1:1), the K2:1/K1:1 ratio reaching a value of 10 (in MeCN). The inverse relation, i.e. K2:1Â <Â K1:1, is observed for the related complexes of unsubstituted benzo-15-crown-5 ether. The sandwich complexes were studied by spectrophotometry, 1H NMR spectroscopy, mass spectrometry, and density functional theory calculations. A correlation was found between the K2:1/K1:1 ratio and the number of short stacking contacts in the sandwich complex.
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Journal: Tetrahedron - Volume 73, Issue 6, 9 February 2017, Pages 681-691