title: Lambda-type regioregular oligothiophenes: synthesis and second-order NLO properties.
abstract: 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.
authors.affiliation: 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.
authors.forename: Samia
authors.initials: S
authors.lastname: Zrig
authors.forename: Guy
authors.initials: G
authors.lastname: Koeckelberghs
authors.forename: Thierry
authors.initials: T
authors.lastname: Verbiest
authors.forename: Bruno
authors.initials: B
authors.lastname: Andrioletti
authors.forename: Eric
authors.initials: E
authors.lastname: Rose
authors.forename: André
authors.initials: A
authors.lastname: Persoons
authors.forename: Inge
authors.initials: I
authors.lastname: Asselberghs
authors.forename: Koen
authors.initials: K
authors.lastname: Clays