Supramolecular Crystal Structure And Properties Of Dipyridly Groups Based On Hydrogen Bonding

Supramolecular chemistry is a science which mainly study the orderly supramolecular system with the special function self-assembled from two or more compounds through the intermolecular force.In recent years,supramolecular compounds have drawn people's attention because of their broad application prospects in fluorescence,adsorption,catalysis,medicine and other fields.In the intermolecular forces,hydrogen bonds are known as"universal keys"because of their unique directivity and predictability in the supramolecular chemistry.In addition,the N atoms in nitrogen-containing heterocyclic compounds contain lone pair electrons,which can easily accept protons and show alkaline,become a well-respected hydrogen bond.Therefore,it is one of the subjects that crystallists are interested in.Dipyridyl olefins and their derivatives are a kind of special nitrogen-containing heterocyclic compounds.When they take part in the process of self-assembly,there are classical hydrogen bonds and?-?stacking in forming the new supramolecular compounds with complex structures and unique properties.In this work,we chose three dipyridyl olefins derivatives 1,2-bis?4-pyridyl?ethylene?bpe?,1,4-bis[2-?4'-pyridyl?ethenyl]benzene?1,4-bpeb?and 1,3-bis[2-?4'-pyridyl?ethenyl]benzene?1,3-bpeb?,which are similar in structure,to react with Brnsted acids through volatilization or solvothermal method.Seven supramolecular compounds were obtained by self-assembly.We carried out their crystal structures and discussed the effects of hydrogen bonding on their structures and thermal stability,which provides an important reference for the study of the self-assembly of supramolecular compounds and their applications.The specific contents of this paper are as follows:inorganic acids?H₃PO₄,HCl O₄,H₂SO₄?.Their crystal structures were carried out through X-ray single crystal diffraction,their purity and thermal stability were discussed by powder XRD,IR-Raman spectroscopy and differential thermal-thermogravimetric analysis.The results show that there is a high purity and good thermal stability in these three supramolecular compounds.2.Twosupramolecularcompounds,[(C₂₀H₁₆N₂)_1.5?C₆H₆O₃?·CH₃OH]_n?4?and[(C₂₀H₁₆N₂)₂?C₆H₂Br₄O₂?₂]_n?5?,have been prepared by 1,4-bis[?4'-pyridyl?ethenyl]benzene?1,4-bpeb?and different phenols?pyrogallol,tetrabromo-cetylphenol?.Their crystal structures were carried out through X-ray single crystal diffraction,their purity and thermal stability were discussed by powder XRD,IR-Raman spectroscopy and differential thermal-thermogravimetric analysis.The results show that there is a high purity and good thermal stability in these two supramolecular compounds.have been prepared by 1,3-bis[?4'-pyridyl?ethenyl]benzene?1,3-bpeb?and 5-?3'-carboxyphenoxy?isophthalic acid and tetrabromo-cetylphenol.Their crystal structures were carried out through X-ray single crystal diffraction,their purity and thermal stability were discussed by powder XRD,IR-Raman spectroscopy and differential thermal-thermogravimetric analysis.The results show that there is a high purity and good thermal stability in these two supramolecular compounds.