Water soluble calix[4]arenes. A thermodynamic investigation of proton complex formation

被引:94
|
作者
Arena, Giuseppe [1 ]
Cali, Rosario [1 ]
Lombardo, Gaetano Giuseppe [2 ]
Rizzarelli, Enrico [1 ,2 ]
Sciotto, Domenico [1 ]
Ungaro, Rocco [3 ]
Casnati, Alessandro [3 ]
机构
[1] Univ Catania, Dipartimento Sci Chim, Viale A Doria 8, I-95125 Catania, Italy
[2] CNR, Ist Studio Sostanze Nat Interesse Alimentare & Ch, Catania, Italy
[3] Univ Parma, Ist Chim Organ, I-43100 Parma, Italy
关键词
D O I
10.1080/10610279208027437
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Thermodynamic parameters of protonation of calix[4]arene-p-tetra sulphonate were potentiometrically and calorimetrically determined in aqueous solution at 25 degrees C and I = 0.1 mol dm(-3) (NaNO3). These values were compared with literature findings. AW and AF values reveal that the penta-anion protonation is energetically costly. In this connection the role played by hydrogen bonding and the cone conformation stabilization are critically discussed. Proton formation constants of the calix[4]arene-p-tetrasulphonate-tetra-carboxylate derivative in the cone conformation were also potentiometrically determined under the same experimental conditions.
引用
收藏
页码:19 / 24
页数:6
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