Abstract
A new modified calix[4]arene, namely 5,11,17,23-tetra- tert-butyl-25,27-dihydroxy-26,28-bis[(tetramethyldiamidophosphinyl)oxy]calix[4]arene (L) has been prepared by reacting the parent calixarene with tetramethyldiamidophosphoric acid chloride, and its structure was solved by the X-ray diffraction method in the solid state and characterized in solution using 1H, 13C, 31P NMR and mass spectral (ES-MS and FAB-MS) data. The coordination ability of L towards Na + showed the formation of two different complex species, [NaL] +[AuCl 4] − · 4H 2O ( 1) and [Na 2L 2](ClO 4) 2 · (CH 3OH) 4 ( 2), depending on the reaction conditions and nature of the counter ion. Complex 1 is structurally characterized using NMR ( 1H, 13C, 31P) and mass spectral data. Complex 2 crystallizes with four molecules of methanol, two of them being bridges between two calixarene units and its structure was determined by X-ray analysis.
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