The solid-state structure of calix[4]arene dihydroxyphosphonic acid–l-lysine complex

The solid-state structure of calix[4]arene dihydroxyphosphonic acid with l-lysine shows a high degree of complexity. The system presents three independent molecules of amino acid, all in different conformational structures, associated with four molecules of calixarene, in the presence of a relatively high number of solvent molecules. The general topology of the complex is guided by the layer of two dimeric units of calixarene molecules and by the large network of hydrogen bonds generated by the molecules of lysine. The arrangement of lysine molecules in the crystal generates a 1-D ladder network.