Anion and cation recognition by new mono- and bis-ruthenium(II) bipyridyl crown ether receptor molecules

被引:39
作者
Beer, PD [1 ]
Dent, SW [1 ]
Fletcher, NC [1 ]
Wear, TJ [1 ]
机构
[1] KODAK LTD,HARROW HA1 4TY,MIDDX,ENGLAND
基金
英国工程与自然科学研究理事会;
关键词
COMPLEXES; AZA; FERROCENE;
D O I
10.1016/0277-5387(96)00010-1
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Novel aza crown and dibenzocrown ether mono- and bis-ruthenium(II) bipyridyl amide-containing receptors have been synthesized and their preliminary Group 1 metal cation and halide anion complexing properties investigated. H-1 NMR coordination studies have shown the receptors bind potassium cations in their respective crown ether recognition sites. Chloride anion coordination studies reveal that those receptors containing secondary amide CO-NNH groups can complex and electrochemically sense chloride anions through a combination of electrostatic attraction and favourable amide CO-NH---anion hydrogen bonding interactions. Stability constant determinations from NMR titration data and electrochemical observations suggest, with receptor [Ru(2)L(6)(bipy)(4)][PF6](4), aza crown ether complexed potassium cations in combination with an amide-linked positively charged ruthenium(II) bipyridyl moiety can cooperatively enhance the strength of chloride anion complexation. In addition, fluorescence emission spectral studies show that the relative emission intensities of the metal-to-ligand charge transfer emission bands of the secondary amide-containing receptors are increased in the presence of chloride anions. Copyright (C) 1996 Elsevier Science Ltd
引用
收藏
页码:2983 / 2996
页数:14
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