Comb hydrogen-bonded

Terpolymer Functionalization Strategies Combing Hydrogen Bonding, Metal Coordination, and Pseudorotaxane Formation... 

The hydrogen bonding scheme is identical in both crystals as seen in Fig. 11 and Fig. 12. The molecules pack so as to provide what maybe aptly described as a hydrogen-bonded comb, with a GA 36 backbone and caffeine 35 teeth. In fact, the major difference between the two polymorphs on the secondary level of supramolecular architecture resides in the torsion of the GA 36 aliphatic chain. 

Fig. 11 Caffeine glutaric acid (35 36) form I crystal packing, showing two hydrogen-bonded combs [59]...

When the NMR spectrum of A is recorded in a non-polar solvent (CCI4 or n-hexane), a triplet-quadruplet substructure superimposed in a comb-like pattern on the primary doublet-triplet main structure (Fig. 7) appears. Such a triplet-quadruplet secondary pattern implies the existence in solution of an intermolecular (P... P) coupling, probably through hydrogen bonds as it is the case for N3P3C14[HN— (CH2)3—NH]33). This assumption is supported by the fact that the secondary structure disappears in highly polar solvents. 

Hydrogen-Bonded Comb Copolymers Nonmesogenic Side Chains. 129... 

Block Copolymer-Based Hydrogen-Bonded Comb Copolymers. 137... 

Hydrogen-Bonded Comb Copolymers Mesogenic Side Chains. 157... 

Finally, we will consider briefly the formation of multilayer thin films by layer-by-layer deposition of hydrogen-bonded polymer pairs [51,52]. In this way a multilayer structure is obtained from potentially miscible polymer pairs. The stability of these films very much depends on the presence of hydrogen bonds, and pH may be used as an external trigger to erase the layered structure [53,54] and selectively dissolve one of the components [25-27]. This procedure allows for the preparation of microporous films not unlike the nanoporous films obtained by dissolution of the hydrogen-bonded side groups from self-assembled block copolymer-based comb-shaped supramo-lecules [15,17,18]. 

Hydrogen-Bonded Comb Copolymers Nonmesogenk Side Chains... 

Fig. 13 Illustration of the formation of hydrogen-bonded comb copolymers and subsequent micellization in a selective solvent. Reprinted with permission from [127]. 2005 American Chemical Society...

The concept where amphiphihc molecules are hydrogen bonded to one block of a block copolymer to form specific comb-shaped supramolecules allows the production of nanoporous materials in a straightforward way. The concept is illustrated in Fig. 24. The procedure was first applied to a polystyrene-bZocfc-poly(4-vinylpyridine) diblock copolymer with a stoichiometric amount of pentadecylphenol hydrogen bonded to the P4VP block. The relative block lengths were selected to render a lamellar-m-cylindrical morphology, where the P4VP(PDP) comb-shaped blocks form the cylinders... 

Hydrogen bonded PLC structures 3.2.2 Comb-like or side chain architecture... 

Figure 3.8 Molecular components used in the hydrogen-bonded comb-like PLCs of Kato and Frechet and coworkers.

Figure 3.14 Structure proposed for a doubly hydrogen-bonded comb-like PLC complex [20].

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