NMR of liquid crystal dendrimers by Carlos Rodrigues da Cruz, João L. Figueirinhas, Pedro J.

By Carlos Rodrigues da Cruz, João L. Figueirinhas, Pedro J. Sebastião

Dendrimers are hyperbranched molecules with well-defined nanometer-scale dimensions. very important technological functions of those platforms, either in biomedicine and fabrics technological know-how, were lately proposed. Liquid crystal dendrimers are interesting fabrics that mix the features of dendrimers with the anisotropic actual behaviour and molecular self-organization common of liquid crystals. This targeted organization of actual and chemical houses, including the potential of multi-selective functionalization recommend by way of dendrimers, opens new views for purposes. Nuclear magnetic resonance (NMR) is a strong experimental process utilized in fabrics technological know-how and an enormous device to the examine of molecular association and dynamics. This publication offers an advent to dendrimers homes with targeted perception into liquid crystal dendrimers and an in depth description of the NMR conception and experimental ideas utilized in the research of those fabrics. It additionally discusses fresh NMR learn effects on liquid crystal dendrimers, with emphasis on molecular order and dynamics studies.

This ebook introduces the houses of dendrimers, with certain perception into liquid crystal dendrimers, and an in depth description of NMR thought and experimental thoughts utilized in the research of those fabrics. It additionally discusses result of contemporary NMR examine on liquid crystal dendrimers, with an emphasis on molecular order and dynamics reviews. complicated undergraduate and graduate scholars of physics, chemistry, and fabrics technology and researchers within the fields of dendrimers, liquid crystals, and NMR will locate the publication tremendous useful.

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And Guillon, D. (2007). Liquid crystalline dendrimers, Chemical Society Reviews 36, 9, pp. 1495–1513, with permission of The Royal Society of Chemistry. their grafting position on the benzene ring. Different results can also be obtained through repetitive branching of similar dendritic units, formally represented by ( A Bn )G X , or by mixed arborescence, (A Bx )(A B y )(A Bz )(A Bn )X with x, y, z, n = 1, 2, 3 (see Fig. 14 for examples of different generations, branching multiplicities, and chains’ positions).

In those phases, the dendrimers pile up, ensuring the microsegregation between the dendritic cores, which remain in the interior of the columns, and the mesogenic units that stay at the periphery (see Fig. 6). , 1998). The functionalization of this type of carbosilane dendrimers with specific chiral mesogenic groups lead to the formation of SmC* and SmA phases for lower generations (G1–G3). , 2000, 2001). Similar dendrimers of generations 4 and 5 exhibit a single Colr phase. 6 Schematic representation of molecular arrangements in smectic and columnar phases of dendrimers, showing the effect of microsegregation between the dendritic core and mesogenic units (Donnio and Guillon, 2006).

2006). The NMR-Dendrimers 41 November 8, 2016 13:20 PSP Book - 9in x 6in 42 Molecular Structures of Liquid-Crystalline Dendrimers functionalization of a G1 carbosilane dendrimer, as those described above, with an photosensitive azobenzene unit allowed for the study of these materials as candidates for optical data storage. , 2001). Carbosilane dendrimers with the same central tetravalent described above, NC = 4, and a more crowded dendritic structure, characterized by a branching multiplicity NB = 3, functionalized with cholesteryl and cyanobiphenyl mesogenic groups (see Fig.

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