Supramolecular Compounds And Transition Metal Coordination Polymers Synthesized And Characterized

With the rapid growth in supramolecular chemistry in recent years, a great deal of effort has been devoted to the design and assembly of supramolecular compounds, for these compounds have potential applications in the ionophore chemistry, ion pair extraction chemistry, phase transfer catalysis chemistry and so on. Moreover, the syntheses of various supramolecular compounds help to obtain new information of intermolecular interactions, which is apparently important for rational design and construction of new framework structures. Currently, a lot of researchers are focusing their attention on the crystal engineering of supramolecular architectures organized by coordinate covalent bonds or hydrogen bonds and (-( stacking interactions. In particular, the hydrogen bonding has attracted most interest due to its relative strength and directionality in generating a great variety of one- (1-D), two- (2-D), and three-dimensional (3-D) either non-interpenerating open networks with variable cavities or channels of desire size, or well entangled structures through interpeneration. Pyridine-2,6-dicarboxylic acid (H2DPC), which possesses diverse function groups and can give more possibility to form bridging hydrogen bonds, is very interesting and has potential for self-assembly. So in this paper, we report the synthesis and crystal structure of [Cu(DPC)(H2O)3], exhibiting an unusual 3-D supramolecular framework structure with one-dimensional channels formed via extensive hydrogen bonding and (-( stacking interactions.We also obtained a monocrystal by the reaction of Ce(NO3)3·6H2O with Pyromellitic dianhydride in oxalic acid aqueous solution, the hydrothermal reaction resulted in the complex [Ce2(H2btc)(btc)(H2O)2]n (btc= Pyromellitic dianhydride). The structures and characters of these compounds were measured and expressed by elemental analyses, IR spectrum, thermogravimetric (TG) analysis and single-crystal X-ray diffraction.