| Summary: | 碩士 === 中原大學 === 化學研究所 === 99 === This thesis discusses the synthesis and structures of three new metal - organic frameworks (MOFs) containing dipyridyl amide and dicarboxylate ligands. The Cd(II) complexes [Cd(bpdc)(L1)]n (1)．1.5DMF, {[Cd2(1,4-ndc)2(L1)2(H2O)]．H2O．2DMF}n (2) and {[Cd(1,4-ndc)(L2)(H2O)]．2H2O}n (3) have been prepared by the hydrothermal reactions of Cd(II) salts with N,N'-di(4-pyridyl)adipoamide (L1), N,N'-di(3-pyridyl)adipoamide (L2), 4,4'-biphenyldicarboxylic acid (H2bpdc) and naphthalene-1,4-dicarboxylic acid (1,4-H2ndc). All the complexes have characterized by single crystal X-ray diffractometer, powder X-ray diffractometer, elemental analyzer, thermogravimetric analyzer, infrared spectrophotometer, ultraviolet/visible spectrophotometer, gas absorption and fluorescence spectrophotometer.
Single crystal X-ray diffraction showed that complex 1 forms a two-fold interpenetrated 3D framework with a (42,64)(43,67)2 topology, while complex 2 forms a three-fold interpenetrated 3D framework with a (4,62)(42,63,8)(43,65,82) topology and complex 3 displays a 2D → 3D polycatenated framework with a (44,62) topology. Although interpenetration occurs in complex 1, it still exists channels along c axis, with cross sections about 15.65 × 15.65 Å2 and the solvent-accessible volume is 47.8 % of the unit cell volume. However, due to the three-fold interpenetration in 2, the solvent-accessible volume of complex 2 is only 19.4 % of the unit cell volume. The solvent-accessible volume of complex 3 is 9.4 % of the unit cell volume.
|
|---|
