[Interaction models of cucurbit (n=6,7,8) urils and imidazo[4,5,f]1,10-phenanthroline derivates].

The interaction structures and optical properties of host-guest of cucurbit[n=6-8]urils with synthesized three imidazo-[4,5, f]1,10-phenathroline derivates were investigated by using 1HNMR technique, fluorescence spectrophotometry, and ultraviolet spectrophotometry. The experimental results reveal that cucurbit [6] uril (Q[6]) can only interact with guest salt of 2-(4-methyl)-phenyl-imidazo-[4,5,f]1,10-phenathroline (W1) with a ratio of 1:1; however, cucurbit [7] uril (Q[7]) can interact with all three guest salts of 2-(4-methylphenyl)-imidazo-[4,5,f]1,10-phenathroline(W1), 2-(2-methylphenyl)-imidazo-[4,5,f] 1,10-phenathroline(W2), and 2-(3-methyloxyl phenyl)-imidazo-[4,5,f]1,10-phenathroline(W3) with the same ratio of 1:1; cucurbit [8] uril (Q[8]), except interaction with W1 with a ratio of 1:2, can also interact with W2 and W3 with a ratio of 1:1.