Synthesis, Structural Characterization and Properties of Metal Coordination Polymers with 1,3-bis(4-pyridyl)propane and Oxygen-Containing Ligands

• Main Authors: Ying-Fung Wang, 王盈方
• Other Authors: Chih-Chieh Wang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/74170644822462068086

碩士 === 東吳大學 === 化學系 === 102 === Two coordination polymers with the formulas, {[Co(bpp)(2,6-ndc)(H2O)2 ]‧2(C2H5OH)}n (1) and {[Zn3(bpp)2(2,6-ndc)3(H2O)2]‧2(C2H5OH)}n (2), (bpp = 1,3-bis(4-pyridyl)propane, 2,6-ndc2- = 2,6-naphthalenedicarboxylate), have been synthesized and structurally characterized by single-crystal X-ray diffraction studies. In compound 1, the Co(II) ion is six-coordinate in a distorted octahedral environment bonded to two oxygen atoms of two bis-monodentate 2,6-ndc2- ligands, two nitrogen atoms of two bis-monodentate bpp ligands and two water molecules. A 2D layered metal-organic framework(MOF) is formed through the connectivity of [Co2(bpp)2]4+ macrocycle with 2,6-ndc2- ligands. Adjacent 2D layered MOFs are then extended to its 3D supramolecular architecture through C-H×××O type hydrogen bonding interactions among 2,6-ndc2-, bpp ligands and ethanol molecules. In compound 2, two crystallographically independent Zn(II) ions are found, one is lay in a distorted octahedral environment bonded to six oxygen atoms of four tris-monodentate 2,6-ndc2- and two water molecules, where the other one is lay in a distorted tetrahedral environment bonded to two oxygen atoms of one tris-monodentate and one bis-monodentate 2,6-ndc2- ligands and two nitrogen atoms of bis-monodentate bpp ligands. A 2D layered MOF is formed through the connectivity of Zn(II) ions (Zn(1) and Zn(2)) with 2,6-ndc2- and bpp ligands. Adjacent 2D MOFs are then mutually interpenetrated and extended to its 3D supramolecular architectures. The intermolecular p-p stacking interactions and C-H×××O type hydrogen bonding interactions provide the extra-energy on the stabilization of its 3D supermolecular architecture. The thermal stability of 1 and 2 are studied by the TG analysis associated with in-situ powder X-ray diffraction measurements. et al. / Journ