STRUCTURE OF AGGREGATES OF TRANS-4-ALKOXY-4'-CARBOXYSTILBENES IN THE SOLID-STATE AND IN MICROHETEROGENEOUS MEDIA - A LINK BETWEEN THE UNIT AGGREGATE AND EXTENDED ARRAYS
S. Vaday et al., STRUCTURE OF AGGREGATES OF TRANS-4-ALKOXY-4'-CARBOXYSTILBENES IN THE SOLID-STATE AND IN MICROHETEROGENEOUS MEDIA - A LINK BETWEEN THE UNIT AGGREGATE AND EXTENDED ARRAYS, JOURNAL OF PHYSICAL CHEMISTRY B, 101(3), 1997, pp. 321-329
Crystals of three 4-alkoxy-4'-carboxy trans-stilbene (ACS) derivatives
and a crystal of 4-methoxy-4'-methanoate trans-stilbene have been sho
wn to have structures in which the amphiphilic aromatics are arranged
in layers remarkably similar to deposited Langmuir-Blodgett multilayer
assemblies. Within each layer there is either a glide or pseudoglide
(or herringbone) arrangement of the chromophores very similar to that
deduced from physical properties and simulations for structurally rela
ted stilbene, azobenzene, and tolan amphiphiles in microheterogeneous
media, solution, and Langmuir-Blodgett (LB) films. The fluorescence of
the crystals is very similar to that associated with LB films of a wa
ter-insoluble amphiphilic ACS that is associated with the aggregate. A
n analysis of the crystal structure indicates that energetically favor
able aromatic-aromatic (edge-face) interaction determines the packing
within a layer.