A Watersoluble Sulfonatomethylated Calix[4]resorcinarene as Artificial Receptor of Metal Complexes |
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| Authors: | Viktoriya V Skripacheva Ella Kh Kazakova Nelly A Markarova Vladimir E Kataev Ludmila V Ermolaeva Wolf D Habicher |
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| Institution: | (1) Kasan Scientific Centre of the Russian Academy of Sciences, A.E. Arbuzov Institute of Organic and Physical Chemistry, Arbusov Str. 8, Kasan, 420088, Russia;(2) Institute für Organische Chemie, Technische Universität, Mommsenstr. 13, 01062 Dresden, Germany |
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| Abstract: | The binding of different sized and shaped metal complexes Co(His)2]ClO4(1), Co(en)2C2O4]Cl (2) and K18-crown-6]SCN (3)(en-ethylendiamine, His-L-histidynate-anion) with a new tetrasulfonatomethylcalix4]resorcinarene(H8X]Na4) was investigated in neutral and alkaline aqueous media by NMR and pH-metrictitration methods and compared with those of recently studied NMe4Br (4). The resultsobtained indicate that the outer-sphere coordination of complexes 1–3 byH8X]4- proceeds via the interaction of hydrophobic fragments of the guestswith both the negatively charged rim and the hydrophobic cavity as a  -base. Thenature of binding does not change for cations 1, 2 and 4 on going fromH8X]4- in neutral to H4X]8- in alkaline media, while the inclusionof 3 decreases on going from H8X]4- to H4X]8-. |
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| Keywords: | water soluble calix[4]resorcinarene second sphere complexation |
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