A trigonal prismatic ligand in the metal-mediated self-assembly of one- and two-dimensional metallosupramolecular polymers.

A novel trispyrazine-pillared prismatic bicycooxacalixaromatic ligand L is synthesized, and its application in metal-mediated self-assembly is described. Under self-assembly conditions, single chain, double-stranded cross-linked coordination polymer and two-dimensional (2D) coordination polymeric networks were formed via M-L (Ag(+), Cu(2+), and Zn(2+)) coordinative interactions. Structural analyses revealed that the antiparallelly arranged one-dimensional coordination polymers (Cu(2+) and Zn(2+)) are arranged to generate well-defined voids to host aromatic guests (benzene) via C-H···π and π···π interactions, while the double-stranded cross-linked coordination polymer (Ag(+)) contains a rhomboidal [Ag2(L(3))2] (L(3): tridentate ligand) cage motif to include a benzene guest; the "thicker" (thickness: ac 5 Å) 2D coordination polymeric networks (Ag(+), Cu(2+), and Zn(2+)), however, are all formed by connection of one or two kinds of topologically different metallomacrocyclic cage units.

Coordination-driven self-assembly of discrete and polymeric copper(ii) and dicopper(ii) supramolecular structures based on oxacalix[2]benzene[2]pyrazines.

The reaction of oxacalix[2]benzene[2]pyrazines and with copper(ii) nitrate, as well as dimeric copper(ii) tetraacetate are presented. Ligands and , both adopt 1,3-alternate conformation, with the two exo-Lewis basic sites spatially oriented outwards. Ligand reacts with copper(ii) ions generated a discrete molecular cage by bridging two ligands via two Cu(2+) ions in the equatorial region.