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Physica A 168 (1990) 172-178 North-Holland
 

Summary: Physica A 168 (1990) 172-178
North-Holland
ON THE THEORY OF TRIPOD AMPHIPHILES, CHIRAL
DISCRIMINATION AND PHASE TRANSITIONS IN LANGMUIR
MONOLAYERS
David ANDELMAN
School of Physicsand Astronomy, Tel Aviv University,RamatAviv 69978,Israel
Chiral discriminationis investigatedtheoreticallyfor chiralmoleculesthat form an insoluble
Langmuir monolayer on the water/air interface. For a specifictype of model molecules-
tripod amphiphile- the chiral discriminationis calculatedfor various types of intermolecular
interactions: van der Waals, hydrogen bonding, dipoles, charges, etc. In particular, we find
that van der Waals interactions prefer chiral segregation whereas electrostatic interactions
prefer heterochiral compounds. Monolayerphase diagrams are calculated for both cases.
Chiral molecules are of fundamental importance in biology, organic chemis-
try and in the design of novel optically active materials [1-3]. Since the origin
of chiral discrimination and chiral specificity is only poorly understood in bulk
three-dimensional systems, we restrict ourselves in the present study to a
two-dimensional geometry. Such a simplified geometry can be realized in a
Langmuir monolayer arrangement, where chiral amphiphiles are restricted to
lie on the water/air interface. Although relatively few studies on mixtures of

  

Source: Andelman, David - School of Physics and Astronomy, Tel Aviv University

 

Collections: Materials Science; Physics