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Transition Metal Ion Directed Supramolecular Assembly of One‐ and Two‐Dimensional Polyrotaxanes Incorporating Cucurbituril
Author(s) -
Park KiMin,
Whang Dongmok,
Lee Eunsung,
Heo Jungseok,
Kim Kimoon
Publication year - 2002
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/1521-3765(20020118)8:2<498::aid-chem498>3.0.co;2-m
Subject(s) - cucurbituril , supramolecular chemistry , chemistry , rotaxane , metal ions in aqueous solution , self assembly , polymer , crystallography , metal , coordination complex , ion , polymer chemistry , nanotechnology , materials science , organic chemistry , crystal structure
This paper reports a synthetic strategy to construct one‐ and two‐dimensional (1D and 2D) polyrotaxanes, in which a number of rings are threaded onto a coordination polymer, by the combination of self‐assembly and coordination chemistry. Our approach to construct polyrotaxanes with high structural regularity involves threading a cucurbituril (CB) “bead” with a short “string” to form a stable pseudorotaxane, followed by linking the pseudorotaxanes with metal ions as “linkers” to organize into a 1D or 2D polyrotaxane. A 4‐ or 3‐pyridylmethyl group is attached to each end of 1,4‐diaminobutane or 1,5‐diaminopentane to produce the short “strings”, which then react with the cucurbituril “bead” to form stable pseudorotaxanes. The reaction of the pseudorotaxanes with various transition metal ions including Cu II , Co II , Ni II , Ag I , and Cd II produces 1D or 2D polyrotaxanes, in which many molecular “beads” are threaded onto 1D or 2D coordination polymers as confirmed by X‐ray crystallography. The overall structure of a polyrotaxane is the result of interplay among various factors that include the coordination preferences of the metal ion, spatial disposition of the donor atoms with respect to the CB beads in the pseudorotaxane, and the size and coordination ability of the counteranion.