JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
|
1996年
/
11期
关键词:
D O I:
10.1039/dt9960002341
中图分类号:
O61 [无机化学];
学科分类号:
070301 ;
081704 ;
摘要:
New acyclic mononuclear ruthenium(II) bipyridyl amide receptors containing phenolic and sterically bulky tert-butyl pendant arms have been prepared and characterised. Spectroscopic and electrochemical anion-coordination studies have shown these receptors to bind chloride, bromide and iodide anions via a combination of electrostatic attraction and favourable amide CONH and phenolic ROH hydrogen-bonding interactions. Stability constant determinations from NMR titration data and electrochemical observations indicate that the presence of additional phenolic hydrogen-bonding units significantly enhances the strength of anion complexation. In addition, incorporation of sterically bulky tert-butyl groups to the amide units confers improved selectivity for chloride over iodide anions. Fluorescence-emission spectroscopic studies show that the relative emission intensities of the metal-to-ligand charge-transfer emission bands of the receptors is enhanced in the presence of chloride and bromide but diminished by iodide anions.
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页码:2341 / 2346
页数:6
相关论文
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