Supramolecular polymers based

Utilization of the single hydrogen bond between pyridine and benzoic acids in SLCP s has been a source of inspiration for other groups in the development of main-chain supramolecular polymers based on diacids and dipyridines.53-56 Supramolecular rod-coil polymers have been developed by assembly of 4,4 -bipyridines and telechelic polypropylene oxide with benzoic acid end-groups, which show highly ordered liquid crystalline phases.57 The use of tartaric acid derivatives in combination with bipyridine units resulted in the formation of hydrogen-bonded, chiral main-chain LCP s, as has been shown by circular dichroism measurements, optical microscopy, and X-ray data.58,59... 

The number of supramolecular polymers based on very strong multiple hydrogen-bonded units is relatively small because of the increased synthetic efforts required for the synthesis of the monomers. Intriguing architectures such as nanotubes88 are obtained... 

Although the supramolecular polymers based on bifunctional ureidopyrimidinone derivatives in many ways behave like conventional polymers, the strong temperature dependence of their mechanical properties really sets them apart from macromolecular polymers. At room temperature, the supramolecular polymers show polymer-like viscoelastic behavior in bulk and solution, whereas at elevated temperatures liquid-like properties are observed. These changes are due to a 3-fold effect of temperature on the reversible polymer chain. Because of the temperature dependence of the Ka value of UPy association, the average DP of the chains is drastically reduced at elevated temperatures. Simultaneously, faster dynamics of the scission—recombination process leads to faster stress relaxation in an entangled system. These two effects occur in addition to the temperature-dependent stress relaxation processes that are also operative in melts... 

Kiyonaka. S. Sugiyasu. K. Shinkai, S. Hamachi. I. First thermally responsive supramolecular polymer based on glycosylated amino acid. J. Am. Chern. Soc. 2002. 124, 10954-10955. 

Li SL, Xiao T, Xia W, et al. New hght on the ring—chain equilibrium of a hydrogen-bonded supramolecular polymer based on a photochromic dithienylethene unit and its energy-transfer properties as a storage material. Chem EurJ. 2011 17 10716-10723. 

Boileau S, Bouteiller L, Laupretre F, Lortie F (2000) Soluble supramolecular polymers based on urea compounds. New J Chem 24(ll) 845-848... 

Supramolecular Polymers Based on the Hydrogen-Bonding Bis-Urea Motif... 

Harada and coworkers developed a variety of supramolecular polymers based on the host-guest interaction of cyclodextrin (CD) derivatives with hydrophobic guests, such as the adamantyl and cinnamoyl groups [45,46]. Consequently, various structures were obtained by conjugating cinnamoyl and hydrocinnamoyl groups to a- and/3-CD. When the hydrocinnamoyl group was attached to -CD, the flexibility of the linker resulted in the formation of a self-inclusion complex - in other words. 

Han FS, Higuchi M, Kurth DG (2007) Metallo-supramolecular polymers based on functionalized his-terpyridines as novel electrochromic materials. Adv Mater 19 3928-3931. doi 10.1002/adma.200700931... 

Supramolecular Polymers Based on Cyclodextrins for Drug and Gene Delivery... 

Figure 4.11 Metallo-supramolecular polymers based on (a) SCS-Pd" prncer-pyridine or SCS-Pd" pincer-nitrile complexes and (b) Ru(bpy)3 + side chains.

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