| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1334849 | Polyhedron | 2011 | 7 Pages |
The mild hydrothermal reaction of Cd, Zn, or Cu(II) acetate salts with the deprotonated flexible linker homophthalic acid (H2hmph) and the rigid molecule 4,4′-bipyridine (bpy) produced the following complexes, featured structurally by the assembly of various metal carboxylate subunits cohered further by the bpy ancillary ligand: {[Cd2(hmph)2(bpy)(H2O)2]·H2O}n (1) manifests cadmium carboxylate zigzag chain motifs, containing the alternation of a hmph-bridged Cd2(hmph)2 dimer and an edge-shared Cd2N4O10 dimer, connected further by the bpy ligands to form a layered structure with a large 50-membered ring; [Zn(hmph)(bpy)]n (2) processes hmph-bridged Cd2(hmph)2 dimer motifs inter-linked further by the bpy ligands to generate mutually embedded layered structures with square (4,4) grids; and {[Cu(hmph)(bpy)]·H2O}n (3) consists of copper carboxylate helix motifs, featuring hmph-bridged CuN2O4 octahedra cross-linked further by the bpy ligands into a twofold-interpenetrating 3D chiral framework with a homochiral topology of a quartz dual net. This well-defined synthetic system was proposed to highlight the fact that organic linkers display markedly different coordination preferences at specific metal ions. In addition, the fluorescence properties of complexes 1 and 2 were rationalized in terms of the local ligand environments in the crystal structures, and magnetic properties of complex 3 are also given.
Graphical abstractThe Cd, Zn or Cu(II) centers cooperatively coordinated by the deprotonated flexible homophthalic acid and rigid 4,4′-bipyridine molecules produced three new coordination polymers under mild hydrothermal conditions, the structures and properties of which are highly sensitive to the nature of the metal ions.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A well-defined synthetic system produces three metal (II) complexes. ► The flexible poly-carboxylate expands the syntheses of coordination polymers. ► The linkers display different coordination preference at the specific metal ion. ► The structures and properties are strikingly sensitive to the metal center.
