DICYCLOHEXYLAMIDES AS IONOPHORES FOR LI-SELECTIVE ELECTRODES - CRYSTAL-STRUCTURES OF A TRIAMIDE LIGAND AND ITS COMPLEX WITH LITHIUM ION

The influence of structure and lipophilicity of dicyclohexylamides on the lithium selectivity in membrane electrodes is discussed. The cryst al structures of the triamide podand 1 and its complex with LiBr 1b ha s been determined by X-ray analysis. Crystal data for ligand 1: C48H83 O6N3, triclinic, P1, a = 10.749(2), b = 12.097(3), c = 19.123(6) Angst rom, alpha = 95.76(2), beta = 80.06(2), gamma = 100.27(2)degrees, V = 2403(1) Angstrom(3), Z = 2. Crystal data for the lithium complex 1b: C 48H83O6N3.LiBr.x C2H5OH, monoclinic, P2(1)/c, a = 21.297(6), b = 16.31 6(8), c = 19.450(4) Angstrom, beta = 110.87(2)degrees, V = 6315(3) Ang strom(3), Z = 4. In the complex the ligand adopts a conformation in wh ich oxygen binding sites surrounding the Li+ cation form a slightly di storted trigonal prism.