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Article Dans Une Revue Chemistry - An Asian Journal Année : 2024

Non‐Linear Optical Activity of Chiral Bipyrimidine‐Based Thin Films

Nathalie Bellec
  • Fonction : Auteur
  • PersonId : 980089
Huriye Akdas-Kiliç
  • Fonction : Auteur
  • PersonId : 981173
Franck Camerel

Résumé

An original series of bipyrimidine‐based chromophores featuring alkoxystyryl donor groups bearing short chiral (S)‐2‐methylbutyl chains in positions 4, 3,4 and 3,5, connected to electron‐accepting 2,2‐bipyrimidine rings, has been developed. Their linear and non‐linear optical properties were studied using a variety of techniques, including one‐ and two‐photon absorption spectroscopy, fluorescence measurements, as well as Hyper‐Rayleigh scattering to determine the first hyperpolarizabilities. Their electronic and geometrical properties were rationalized by TD‐DFT calculations. The thermal properties of the compounds were also investigated by a combination of polarized light optical microscopy, differential scanning calorimetry measurements and small‐angle X‐ray scattering experiments. The derivatives were found not to have mesomorphic properties, but to exhibit melting temperatures or cold crystallization behavior that enabled the isolation of well‐organized thin films. The nonlinear optical properties of amorphous or crystalline thin films were studied by wide‐field second harmonic generation and multiphoton fluorescence imaging, confirming that non‐centrosymmetric crystal organization enables strong second and third harmonic generation. This new series confirms that our strategy of functionalizing 3D organic octupoles with short chiral chains to generate non‐centrosymmetric organized thin films enables the development of highly second order nonlinear optical active materials without the use of corona‐poling or tedious deposition techniques.

Domaines

Chimie

Dates et versions

hal-04479211 , version 1 (27-02-2024)

Identifiants

Citer

Prescillia Nicolas, Stephania Abdallah, Ahmet Dok, Yovan de Coene, Olivier Jeannin, et al.. Non‐Linear Optical Activity of Chiral Bipyrimidine‐Based Thin Films. Chemistry - An Asian Journal, 2024, Chemistry-An Asian Journal, pp.e202400112. ⟨10.1002/asia.202400112⟩. ⟨hal-04479211⟩
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