Synthesis, Characterization, and Properties of Metal-Organic Frameworks with Carboxylate and Benzimidazole Ligand

• Main Authors: Ji-Chiang Hsu, 許績強
• Other Authors: Kuang-Lieh Lu
• Format: Others
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/z8guka

碩士 === 國立臺北科技大學 === 化學工程與生物科技系化學工程碩士班（碩士在職專班） === 105 === This thesis describes the synthesis of a series of metalorganic coordination polymers by reacting Cu2+ or Cd2+ ions with benzimidazole-containing ligand, then with carboxylate-containing molecules. My research is mainly divided into two parts. The first part is focused on the reaction of the 2-(2-pyridyl)benzimidazole (Hpybim) ligand. Self-assembly of Cu(II) ions, Hpybim, and 5-nitroisophthalic acid (H2nipa) resulted in the formation of compound [Cu(Hpybim)(nipa)(H2O)]n (1). Compound [Cd2(Hpybim)2(ipa)2(H2O)2]n (2) was synthesized by the reaction of Cd(II) ions, Hpybim, and isophthalic acid on a water bath. The second part is focused on the reaction of 2-(4-thiazolyl)benzimidazole (Htbz). Compound [Cu(Htbz)(nipa)(H2O)]n (3) was produced by reacting Cu(II) ions, Htbz and H2nipa at 80 °C for 1 day. Compounds 1 and 3 were synthesized by reacting 5-nitroisophthalic acid (H2nipa), Cu(II) ions under similar reaction conditions, except that 2-(2-pyridyl)benzimidazole (Hpybim) was used in the case of 1, and 2-(4-thiazolyl)benzimidazole (Htbz) for 3. Compound [Cd(Htbz)(hia)]n (4) was synthesized by the reaction of Cd(II) ions with Htbz and 5-hydroxyisophthalic acid (H2hia). In addition, compound {[Cu(Htbz)(Hbtc)]·H2O}n (5) was synthesized by the reaction of Cu(II) ions with Htbz and 1,3,5-benzenetricarboxylic acid (H3btc) under hydrothermal conditions at 120 °C for 5 days. These products were characterized by IR spectra, elemental analyses, powder X-ray diffractions and TGA methods. The structures of the five compounds were further confirmed by single-crystal X-ray analyses. Two nitrogen atoms in the Hpybim and Htbz ligands were chelated to metal center ions in compounds 1-5. Compounds 1, 2 and 3 have a 1D zigzag chain structure, while compounds 4 and 5 are 2D coordination polymers. Compounds 3, 4 and 5 have different dimensional structures that are attributed to the use of three different carboxylic acids as bridging ligands. Finally, subtle differences in ligands that trigger the variations in the structures are discussed.