3 years ago

Hierarchical Structures Formed by Flexible Dendrimeric Molecules Based on Gallic Acid

Hierarchical Structures Formed by Flexible Dendrimeric Molecules Based on Gallic Acid
Monika Hejko, Damian Pociecha, Ewa Gorecka, Józef Mieczkowski, Joanna Matraszek
Behavior of first-generation dendrons based on gallic acid is found to be strongly dependent on the number of terminal alkyl chains attached to the outer phenyl rings; only molecules having three alkyl chains per phenyl ring are mesogenic. Due to the hydrogen bonding, they form micelles that are arranged into cubic Pm3n structure. The cubic phase is also found for dimeric and trimeric gallic ester analogues; it is shown that the size of the crystallographic unit cell correlates with the isotropization temperature, apparently small micelles with high density of alkyl chains at the micelle surface interact more strongly stabilizing the cubic phase. Also behavior of gallic acid dendrons in solution is defined by the number of terminal chains, formation of either large liposomes or gel is observed. Mesogenic behavior of first-generation dendrons based on gallic acid is determined by the number of alkyl chains at the outer phenyl rings, only those having three chains per phenyl ring form cubic liquid crystalline phase. Molecules self-assemble into spherical micelles that are arranged into 3D lattice of Pm3n symmetry, and the unit cell is filled with eight micelles.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/macp.201700316

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