Five M(II) coordination polymers assembled from various polynuclear units spaced by semirigid carboxyphenylpropionate and N-donor coligand

A series of five metal(II) coordination polymers are hydrothermally synthesized by employing dual linkers of semirigid 3-(4-carboxyphenyl)propionic acid and various N-donor coligands. The single crystal X-ray diffractions give a diversity of topology nets manifesting various inorganic polynuclear units as the nodes spaced by organic linkers. Their structural dimensionalities span a wide range from 2D layer, 2D -> 3D interpenetrated network, to 3D self-interpenetrated framework. Among them, the 3D self-interpenetrating frameworks for {[Cu-2(cpp)(2)(4,4'-bpy)]}(n) (1) and {[Co(cpp)(bpe)(1.5)(H2O)]}(n) (2) are based on {Cu-2(OCO)(4)} paddlewheel binuclear and CoO3N3 octahedron mononuclear as the nodes, respectively. The 2D layers for {[Zn(Hcpp)(trz)]}(n) (3) and {[Cd(cpp)(2,2'-bpy)]}(n) (4) contain different dinuclear units featuring trz-bridged [ZnN3O2] tetragonal pyramids and edge-shared CdO4N2 octahedra, respectively. The 2D -> 3D interpenetrated framework for {[Cd-3(cpp)(3)(bpp)(2)(H2O)(2)]}(n) (5) are assembled from 6-connected [Cd-3] clusters as the nodes (H(2)cpp= 3-(4-carboxyphenyl)propionic acid, 4,4'-bpy = 4,4'-bipyridyl, bpe 1,2-di(4-pyridyl)ethylene, Htrz = 1,2,4-triazole, 2,2'-bpy = 2,2'-bipyridyl, and bpp = 1,3-di(4-pyridyl)propane). It is shown that the semirigid carboxyphenylpropionate can bear diverse structures of metal-organic frameworks regulated by various N-donor coligands. Fluorescence properties of complexes 3-5 are also investigated.