Lambda-type regioregular oligothiophenes: synthesis and second-order NLO properties.
The synthesis of a new series of Lambda-type, D-Pi-A regioregular oligothiophenes is described. The simultaneous presence of the chiral centers and the Lambda-type structure disfavored the formation of centro-symmetrical dimeric assemblies. Hence, enhanced first hyperpolarizabilities betaHRS were measured in comparison with those of the corresponding monomers.
Zrig
Samia
S
Laboratoire de chimie organique (UMR CNRS 7611), Institut de chimie moléculaire (FR 2769), Université Pierre et Marie Curie-Paris 6, case 181, 4 place Jussieu, F-75252 Paris cedex 05, France.
Koeckelberghs
Guy
G
Verbiest
Thierry
T
Andrioletti
Bruno
B
Rose
Eric
E
Persoons
André
A
Asselberghs
Inge
I
Clays
Koen
K