K. Isomura et al., EFFECT OF ELONGATION OF THE PI-ELECTRON SYSTEM ON THE BEHAVIOR OF AMPHIPHILES CONTAINING THE PYRAZINE RING, Thin solid films, 244(1-2), 1994, pp. 1022-1025
The amphiphile 1b, with a diacetylenic linkage between two aromatic ri
ngs of 5-(p-dodecyloxyphenyl)pyrazine-2-carboxylic acid 1a, and the di
acetylene homologue 2b of 4'-dodecyloxybiphenyl-4-carboxylic acid 2a w
ere newly synthesized. The amphiphile 1b formed an expanded but stable
monolayer at the air-water interface, whereas 2b did not form a monol
ayer. The Langmuir-Blodgett (LB) film obtained by deposition of the mo
nolayer of 1b was shown to be J-aggregates, making a large contrast to
the H-aggregates of the LB film of 1a. The different behaviors of 1a
and 1b were explained in terms of electrostatic multipole-multipole in
teraction between the chromophores in the layered molecular arrangemen
t.