The Sulfonyl Of Amino Acids With Polymer Design, Synthesis, Structure And Nature Of The Study

The coordination polymer is an important sort of metal-organic framework (MOF) whose design and synthesis has seized much attention recently because it may provide a potential and effective way for designing and synthesizing new materials. Amino acid is the fundamental structure unit of biomacromolecules, such as protein and enzyme, and it is also the important biomicromolecular ligand inside the life body. Moreover, N-sulfonyl amino acids were found to be analogue to the structure of O-terminal of peptide and protein. On the other hand, they can reproduce the coordination behavior of peptides and their selectivity towards metal ions. Thus, it is of great interest in studying the coordination chemistry of N-sulfonyl-amino acids and metals, for it can not only act as a model to study the coordination between metals and peptides but it is also very favorable to better understand interactions between the metal ions and the terminal carboxyl of peptide chain.In order to explore the possibility of obtaining the MOFs bearing N-sulfonyl-amine acids and metals and to find out interactions between the metal ions and terminal carboxyl of peptide chain further, we have successfully designed and synthesized five derivatives of N-sulfonyl-amine acid ligand, which can be roughly divided into simply derivatives and carboxyl derivative. With traditional method we have synthesized and obtained 11 compounds utilizing these five ligands and all of them were characterized by X-ray diffraction analysis or by some other means. The X-ray diffraction analysis shows that: compounds 1 and 2 are simply coordination compound and are further connected to supermolecules via weak intermolecular interactions, together with their fluorescent properties and the inner relationship between the structures and their properties; compounds 3 and 4 are one-dimensional structures and 3 has a weak antiferromagnetic interactions. Compounds 5, 6, 7 are 2-dimensional planar structures, and fluorescent properties of 5 comparing with that of why 6 has no fluorescent properties are also analyzed, 7 shows a weak antiferromagnetic interactions. Compounds 8, 9, 10, 11 are one-dimensional, two-dimensional, three-dimensional, three-dimensional structures respectively, and they were assembled by 3-(sulfonyl-glycine)benzoic acid in different conditions, exhibiting remarkable versatile coordination modes of 3-(sulfonyl-glycine)benzoic acid and remarkable ability of coordination, and their magnetic, fluorescent and adsorption properties were also investigated, alongside with the relationship between the structures and properties.The experimental conditions such as the pH value, the source of metal ions, the ratio between metal ions and ligand, the experimental temperature are fully considered when we design and synthesize the compounds.With respect to the experimental skills, we found only white uncharacterized precipitates were obtained if no any auxiliary ligands were added. To our surprise, when 4,4'-bipy ligands were added into the system, the situations were changed remarkably and a series of compounds were obtained, which may suggest the auxiliary ligand may act as a module in the reactions and may not only participate in the formation of the compound but also catalyze the reaction. Although the detailed mechanism is still not clear, the "mix-ligands" methods are a new idea to construct MOFs and have already aroused attractive attention in the design of open porous MOFs.