Formation of a Dicopper Platform Based Polyrotaxane Whose 鈥?i>String鈥?and 鈥?i>Bead鈥?Are Constructed from the Same Components
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文摘
The combination of the dicopper platform [Cu2(L)2(THF)2] (1路2THF), where H2L is 1,1鈥?(1,3-phenylene)-bis-4,4-dimethylpentane-1,3-dione, and 1,4-bis(4-pyridyl)piperazine (bpp), afforded the first example of a one-dimensional polyrotaxane {[(1)(渭2-bpp)][(1)2(bpp)2]}n whose 鈥?i>string鈥?and 鈥?i>bead鈥?are constructed from the same components. The bead of stoichiometry [(1)2(bpp)2] has a large rectangular cavity of dimensions 7.40 脳 15.64 脜 and is threaded onto a stair-like string of composition [(1)(渭2-bpp)]n. The formation of the polyrotaxane is driven by 蟺鈥撓€ stacking between the string and the beads with precise electronic and steric complementarity between these components. A pathway for the formation of the polyrotaxane is proposed.

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