| Coordination polymer has attracted much more interests as its flexible tailoring, various topologies and potential applications in gas storage, catalysts and magnetism. According to the principle of molecular engineering, it is possible to realize rational design and synthesis of novel multifunctional materials by selecting certain metal ions and suitable organic ligands.In this dissertation, we have focused the influence of the metal ions, organic ligands and coligands on secondary building units and compound structures under hydrothermal condition. The synthetic conditions, topology of 10 compounds have been studied. Several factors influencing the final structures, such as the coordination modes of metal ions, the properties of organic ligands, pH value of reaction conditions were discussed. Furthermore, fluorescent property and the thermal stabilities have also been studied. The main contents are summarized as below:1. Three novel 3D (3,8)-connected compounds, [Cd2(L1)2(1,3-bdc)] (1), [Cd2(L2)2(1,4-bdc)]·3H2O (2), [Cd3(L3)2(1,3-bdc)2] (3), have been synthesized based on the combination of flexible HL1 (HL2 or HL3) ligand and rigid benzenedicarboxylate ligand with Cd2-based (or Cd3-based) SBUs under hydrothermal conditions. Compounds 1 and 3 present novel (3,8)-connected nets with unprecedented (42·6)2(44·622·82) and (42·5)2(44·56·610·75·82·9) topology notations; compound 2 is a tfz-d net with (43)2(46·618·84) topology symbol.2. Five new compounds, [Cd(L3)2]·H2O (4), [Zn(L3)2] (5), [Co(L3)2] (6), [Ni(L3)2] (7) and [Cu2(L3)2]·3H2O (8), have been hydrothermally synthesized on the basis of 3,5-bis(pyridin-3-ylmethoxy)benzoic acid (HL3) and d10 transition metal ions. Compound 4 is a binodal (3,4)-connected net with (63)(66) topology. Compounds 5-7 are isostructural, thus, only the structure of 5 is representatively described in detail here. In the crystal structure, the adjacent helical chains are linked by L3 ligands to generate a 2D rhombic structure involving 44-membered rings. With in the layer, all Zn-L3 helical chains display the same chirality, while those in adjacent layers display opposite chirality. Therefore, the overall structure of 5 is a racemic structure. The topology of 5 can be described by the uninodal (4,4)-connected net with (44·62) Schl?fli symbol. The structure of 8 is a 2D binodal (6,3)-connected net constructed by CuI and L3 ligand. 3. Two new compounds, [Zn2(L1)2(1,4-bdc)] (9), [Zn3(L2)(1,4-bdc)3] (10), have been hydrothermally synthesized on the basis of 3,5-bis(pyridin-4-ylmethoxy)benzoic acid (HL1) (or 3,4-bis(pyridin-4-ylmethoxy)benzoic acid (HL2), 1,4-benzenedicarboxylic acid and d10 transition metal ions. Compound 9 displays a 3D 4-fold interpenetrating (3,4)-connected net with (4·82)(4·85) topology. Compound 10 with the carboxybenzyloxyl group undeprotonation of L2 ligand, is a 2D 5-connected network with the (33·44·53) topology.
|
PDF Full Text Request