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Four 1,n-alkylene-di-2-methylpyridinium dibromide (n=6, 8, 10, 12) guests were synthesized and characterized, and the host-guest interactions between cucurbit[7 or 8]urils with these guests were also investigated by using 1 H NMR technique, thermogravimetry analysis and UV-Vis measurement in details. The experimental results revealed that it was different in the interaction models of the formed host-guest inclusion complexes between the cucurbituril with the four guests and thedoi:10.6023/cjoc1104223 fatcat:4727ddlm4zf5jdao56vkxcutdi