کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1311372 | 975319 | 2009 | 9 صفحه PDF | دانلود رایگان |
Six new coordination polymers based on V-shaped linkage 2,5-bis(4-pyridyl)-1,3,4-thiadiazole (bpt) and transition metal ions, [Co(bpt)(pm)0.5(H2O)]n · 3nH2O (1), [Cu2(bpt)(pm)(H2O)4]n (2), [Co(bpt)(pydc)]n · 2nCHCl3 · nH2O (3), [Cu2(bpt)(pydc)2(H2O)2]n (4), [Cu2(bpt)(pydco)2(H2O)2]n · nH2O (5) and [Cd(bpt)(pydco)]n (6) (H4pm = pyromellitic acid, H2pydc = pyridine-2,6-dicarboxylic acid, H2pydco = pyridine-2,6-dicarboxylic acid N-oxide), have been synthesized under the intervention of various polycarboxylate ligands. Complex 1 exhibits a 3-D 4-connected structure with 1-D nanosized open channels encapsulated lots of water molecules. Complex 2 represents a 2-D grid containing two types of rectangular windows. When pydc and pydco instead of pm, complexes 3 and 6 were obtained with highly undulated 2-D layers. The interlayers of 3 are filled with two kinds of solvent molecules, whereas 6 is a double-layered framework without free molecules. Complexes 4 and 5 consist of two distinct 1-D infinite chains held together to form different 2-D supramolecular networks. Importantly, bpt spacer shows changeful conformational geometries and generates complicated crystalline architectures with the introduction of polycarboxylate ligands. Additionally, thermal stability of complexes 1, 3 and 5, fluorescent properties of 6 and X-ray powder diffraction of 1 have also been investigated.
Six new metal–organic coordination polymers based on bpt and transition metal ions under polycarboxylate intervention were synthesized and characterized. Importantly, the nature of polycarboxylate co-ligand and conformational geometries of bpt play a key role in structural modulation. And interestingly, compound 1 exhibits a 3-D 4-connected structure with 1-D nanosized open channels encapsulated lots of water molecules.Figure optionsDownload as PowerPoint slide
Journal: Inorganica Chimica Acta - Volume 362, Issue 6, 20 April 2009, Pages 1730–1738