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Host–Guest‐Driven Copolymerization of Tetraphosphonate Cavitands
Author(s) -
Tancini Francesca,
Yebeutchou Roger M.,
Pirondini Laura,
De Zorzi Rita,
Geremia Silvano,
Scherman Oren A.,
Dalcanale Enrico
Publication year - 2010
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/chem.201002237
Subject(s) - supramolecular chemistry , monomer , copolymer , chemistry , polymer , polymer chemistry , flexibility (engineering) , linker , combinatorial chemistry , organic chemistry , molecule , computer science , statistics , mathematics , operating system
The outstanding complexing properties of tetraphosphonate cavitands towards N ‐methylpyridinium salts were exploited to realise a new class of linear and cyclic AABB supramolecular polymers through host–guest interactions. The effectiveness of the selected self‐association processes was tested by 1 H NMR studies, whereas microcalorimetric analyses clarified the binding thermodynamics and revealed the possibility of tuning entropic contributions by acting on the flexibility of the guest linker. Although the formation of linear polymeric chains for a rigid system was demonstrated by X‐ray analysis, the presence of a concentration‐dependent ring–chain equilibrium was indicated by solution viscosity measurements in the case of a very flexible ditopic BB guest co‐monomer.