Study On The Construction And Performance Of Symmetrical Tetramethyl Six-membered Cucurbit Ring Frame Materials

In this thesis,tetramethylcucurbit[6]uril（TMe Q[6]）was used as a basic building block to construct the porous supramolecular framework（SOF-1）in the HCl medium driven by the outer surface interaction of Q[n]s（OSIQs）,including the dipole interaction between the electrostatic potential negative portal carbonyl oxygen atoms of TMe Q[6]molecules and the electrostatic potential positive outer surface.The SOF-1 has special functional properties to adsorb fluorophore guests（FGs）for the preparation of solid fluorescent probes（FGs@SOF-1）.The results of adsorption experiments show that SOF-1 can absorb certain fluorescent groups to form luminescent assemblies（FGs@SOF-1）by means of fluorescence enhancement or quenching,some of which can respond to certain volatile organic compounds.Therefore,the TMe Q[6]-based FG@SOF-1 can be used as solid sensors for certain volatile organic molecules.Further study shows that the driving forces for the formation of TMe Q[6]-based SOF-2 in 5M H₂SO₄ media are the interactions of the electrostatic potential positive outer surface of TMe Q[6]molecules with the electrostatic potential negative port al carbonyl oxygen atoms of adjacent TMe Q[6]molecules and SO₄^2-anions,respectively.The TMe Q[6]-based SOF-2 also shows absorption characteristics for fluorophore guests（FGs）,such as dyes and polycyclic compounds with fluorescence characteristics.In addition,the SOF-2 adsorbed rhodamine B or pyrene as a fluorescent probe respond to methanol by fluorescence enhancement or quenching.In order to extend the construction strategies for Q[n]-based frameworks,in addition to the strategies of using the self-induced OSIQ and the anion-induced OSIQ,the method of introducing inorganic anion can be further adopted.Three novel Q[n]-based supramolecular frameworks have been successfully prepared by using the[Pd_nCl_m]^2-anion with planar configuration as the structure-directing agent,namely{Na₂（H₂O）₆TMe Q[6]}?[Pd₂Cl₆]^2-?3H₂O（1）,Cy H₅Q[5]?[Pd₂Cl₆]^2-?2（H₃O）⁺?3H₂O（2）,and Q[5]?[Pd Cl₄]^2-?2（H₃O）⁺?23H₂O（3）,respectively.Single-crystal analysis indicated that the driving forces to result in the formation of such frameworks are attributed to the OSIQs,namely ion-dipole interaction formed between the electrostatic potential positive outer surface of Q[n]s and the[Pd_nCl_m]^2-anions.