Assembly of five coordination polymers based on 5,11,17,23-tetra-tert-butyl-25-(carboxymethoxy)-calix[4]arene ligand

Five coordination polymers, [Co(H3L)2(dib)]·1.5H2O(1), [Cu(H3L)2(dib)](2), [Co(H3L)(mtpy)]·DMF(3), [Ni(H3L)2(mtpy)(H2O)]·3DMF·H2O(4), and [Cd(H3L)2(pybim)]·1.5H2O(5), have been successfully prepared from 5,11,17,23-tetra-tert-butyl-25-(carboxymethoxy)calix[4]arene, metal salts, and N-donor auxiliary ligands under hydrothermal conditions[dib=1,4-di(1H-imidazol-1-yl)butane, pybim=2-(2'-pyridyl)benzimidazole, and mtpy=4'-(4- methylphenyl)-2,2':6',2''-terpyridine]. Structural analysis suggests that the metal ion first joins two organic carboxy-late ligands to form the independent units, which are further extended by the N-donor auxiliary ligand to give the final structure. Compounds 1and 2display 1D infinite chains bridged by a flexible bidentate dib ligand. Compounds 3―5, with multidentate chelate ligands, reveal discrete 0D units. Furthermore, in compounds 3and 5, 1D supramolecular architectures are exhibited due to π-πinteractions.