Nori Yamaguchi

Formation of Supramolecular Polymers from Homoditopic Molecules Containing Secondary Ammonium Ions and Crown Ether Moieties

As if with a molecular building kit, a linear supramolecular pseudorotaxane polymer was formed with reversible chain extension in solution by self-organization of two complimentary homoditopic molecules with secondary ammonium and dibenzo[24]crown-8 moieties.

SELF-ORGANIZATION OF A HETERODITOPIC MOLECULE TO LINEAR POLYMOLECULAR ARRAYS IN SOLUTION

Like the proverbial monkey chain one heteroditopic self-complementary molecule, comprising a crown ether unit and a paraquat unit, catches a second such molecule in solution and thus by self-organization forms novel linear oligo- and polymolecular arrays (shown schematically; the crown ether unit is denoted by the ellipse, and the paraquat unit by the rectangle).

Selbstorganisation eines heteroditopen Moleküls zu linearen Aggregaten in Lösung

Wie Schlangen, die sich gegenseitig in den Schwanz beisen: Eine heteroditope, selbstkomplementare Verbindung, bestehend aus einer Kronenethereinheit und einer Paraquateinheit, angelt sich in Losung ihresgleichen und bildet so unter Selbstorganisation neuartige, oligo- und polymolekulare Aggregate (siehe Schema; die Kronenethereinheit ist durch die Ellipse und die Paraquateinheit durch das Rechteck symbolisiert).

Stabilities of cooperatively formed cyclic pseudorotaxane dimers

Systematic analysis of the stabilities of cyclic pseudorotaxane dimers formed between complimentary homoditopic molecules demonstrates that cooperative cyclic dimerization can be minimized by increasing the length of one component via an aliphatic spacer.