Construction of three low dimensional Zn(II) complexes based on different organic-carboxylic acids

Three new Zn(II) complexes based on different organic-carboxylic acids, [Zn(mba)(2)(2,2'-bipy)] (1), [Zn(mpdaH)(2)(H2O)(4)] center dot 4H(2)O (2) and [Zn(cda)(2)(H2O)(2)](n) (3) (Hmba = 4-methylbenzoic acid, H(2)mpda = 2,6-dimethylpyridine-3,5-dicarboxylic acid and H(2)cda = chelidonic acid) have been synthesized successfully under hydrothermal conditions. X-ray single crystal diffractions show that compounds 1 and 2 are the mononuclear and 3 is one-dimensional chain, in which the Zn(II) centers have different coordination geometries with octahedron for 1 and 2 and tetrahedron for 3. Through pi-pi stacking and/or hydrogen bonding (O-H center dot center dot center dot O and O-H center dot center dot center dot N) interactions, different supramolecular structures are assembled, namely, 2D supramolecular layer for 1 and 3D supramolecular networks for 2 and 3. Furthermore, the IR, TGA and luminescent properties are also investigated in this work. (C) 2008 Elsevier B.V. All rights reserved.