| The research of inorganic-organic hybrid supramolecular compounds, involving basic theory and applications, connects inorganic and organic chemistry, which is a fertile field and has potential applied values. Recently, this area has become one of the most active studies of inorganic chemistry, crystal chemistry and material chemistry. Because supramolecular compounds coordinated by oxygen or nitrogen atom have novel topologies, and possess the unique physical and chemical properties, such as non-linear optical materials, catalysis, magnetic materials and porous materials. The study of supramolecular compounds coordinated by oxygen or nitrogen atom in the terms of the designs, syntheses, crystal structures and properties has attracted considerable attention, and it is rapidly developing today.Making use of appropriate metal ions and oxygen, nitrogen-containing organic ligands can gain the anticipative structrures and properties of supramolecular compounds through self-assemble process. In this research, using conventional aqueous solution synthesis method, four new supramolecular compounds have been designed and synthesized. All of them were studied systematically by elemental analysis, infrared and single crystal X-ray diffraction, and some complexes were studied by thermal stability and fluorescence. The results show that these complexes include metal ions and oxygen, nitrogen-containing organic ligands. The major findings are as follows:Four new supramolecular compounds have been synthesized at room temperature on the basis of 1, 10– phenanthroline and 3, 3', 4, 4'--azobenzenetetracarboxylic acid (H4ABTC) by conventional aqueous solution method and they adopt two-dimensional layered structure by hydrogen bonds.{[Co(phen)(H2O)3]2(ABTC)}·2H2O 1[Co(phen)2(H2O)2](ABTC)·5H2O 2[Eu(phen)3](ABTC)·1.5H2O 3{[Zn(phen)3][Zn(ABTC)3(H2O)3]}·2.5H2O 4Both compounds 1 and 2 have two-dimensional structures which are constructed by ABTC, 1, 10– phenanthroline and transition metals. Compound 1 shows that the upper and lower two units, which are made of one 1, 10– phenanthroline, three water molecules and transition metals, connect together through ABTC for the skeleton. And it forms a two-dimensional supramolecular system through hydrogen bonds. Compound 1 and 2 have the same elements. Howere, their structures are different. In Compound 2, ABTC is isolated and not responsible to the unit which was constituted by two 1, 10– phenanthrolines, two water molecules and transition metal. Compound 3 and 2 is very similar, ABTC drifts around the unit which was constituted by three 1, 10– phenanthrolines and metal ions. Its spatial configuration is a beautiful plum petal shape. There are two kinds of metal zinc ions in the basic structural unit of compound 4, one zinc ions and three 1,10 - phenanthrolines form an octahedral six-coordination structure, the other zinc ions and three ABTCs and three water molecules form a nine-coordination of the polyhedron. In Compounds 1-4, they all form supramolecular polymers through the O-H ... O and O-H ... N hydrogen bonds.
|
PDF Full Text Request