Iminodiacetic Acid Derivatives And Metal-organic Gels: Preparation And Applications

The generation of metal-organic gels with three-dimensional (3D) network structures is mainly based on the coordination of metal ions and organic ligands, as well as some relatively weak non-covalent interactions, such as hydrogen bonding, van der Waals force, and π-π interaction. Compared with MOFs, though the crystallinities of metal-organic gels are poor and the structures of metal-organic gels are also not clear, they still have the following advantages: (1) The reaction can proceed at a low temperature, some materials can be obtained at room temperature; (2) The reaction time is shorter and solvent quantity is less; (3) Reaction solvent is cheap and with low toxicity, the reaction can proceed in ethanol, water, N,N’-dimethylformamide or the mixture of them. (4) The easily obtained desired shapes of the gels by utilizing various shapes of reaction containers make them more suitable for industrialized and commercial applications. And the coordination of metal atoms and the orientation and functionality of organic polydentate ligand make metal-organic gels have amounts of potential applications in catalysis, sensing, anion recognition, photophysics, vapor adsorption, separation technologies, electrochemical detection, etc.In this work, three kinds of derivative of iminodiacetic acid were designed and synthesized, with which five series of new stable metal-organic gels with 3D network structures have been prepared successfully by employing Cr3+, Al3+, Fe3+and Zr4+. We investigated their porous properties and their application in gas adsorption.Firstly, two kinds of novel metal-organic gels were synthesized using semi-rigid BP-IDA ligand and Cr(Ⅲ), Al(Ⅲ) by solvothermal method. The structural and physical properties of metal-organic gels porous materials were studies by dynamic rheology measurement, scanning electron microscopy, power X-ray diffraction, infrared spectroscopy, and nitrogen adsorption-desorption measurement.Secondly, a novel metal-organic gel was synthesized using semi-rigid BP-IDA ligand and Fe(III) at room temperature. It’s a class of soft multifunctional materials, it’s able to respond to a variety of external stimuli, including mechanical force and chemical species, and exhibit a reversible sol-gel transition due to reversible non-covalent interactions. After activation of metal-organic gels, it will have excellent electrochemical performance. The structural and physical properties of porous materials were studies by dynamic rheology measurement, scanning electron microscopy, power X-ray diffraction, infrared spectroscopy, amd nitrogen adsorption-desorption measurement.Thirdly, two kinds of novel metal-organic gels were synthesized using semi-rigid TPB-IDA and TPM-IDA ligand with Zr(IV) by solvothermal method. The structural and physical properties of metal-organic gels porous materials were studies by dynamic rheology measurement, scanning electron microscopy, power X-ray diffraction, infrared spectroscopy, amd nitrogen adsorption-desorption measurement.