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Article Dans Une Revue Chemistry - A European Journal Année : 2024

New Multifunctional Bipyrimidine‐Based Chromophores for NLO Active Thin‐Film Preparation.

Umut Bora
Rana Mhanna
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Nathalie Bellec
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Hale Ocak

Résumé

New synthesized bipyrimidine-based chromophores presenting alkoxystyryl donor groups carrying aliphatic achiral and chiral chains in the 4 position, connected to electron-accepting 2,2-bipyrimidine cores have been synthesized. Their linear and nonlinear optical properties were investigated as well as their mesomorphic properties by various techniques (light-transmission measurements, polarized-light optical microscopy, differential scanning calorimetry measurements and two-photon excited fluorescence). The derivatives with achiral linear carbon chains were found to exhibit liquid-crystal properties with the formation smectic phases over large temperature ranges which were confirmed by small-angle X-ray scattering analysis via stacking models. The nonlinear optical properties in the solid state for derivatives with C14 and the citronellol chains have been studied by wide-field second-harmonic generation and multi-photon fluorescence imaging, confirming centrosymmetry for these achiral mesogens and their excellent third-order nonlinearity whereas the chiral compound exhibits non-centrosymmetric organization resulting in a strong Second Harmonic Generation at the crystal state.

Domaines

Chimie

Dates et versions

hal-04305548 , version 1 (24-11-2023)

Identifiants

Citer

Umut Bora, Stephania Abdallah, Rana Mhanna, Prescillia Nicolas, Ahmet Dok, et al.. New Multifunctional Bipyrimidine‐Based Chromophores for NLO Active Thin‐Film Preparation.. Chemistry - A European Journal, 2024, Chemistry-A European Journal, ⟨10.1002/chem.202302930⟩. ⟨hal-04305548⟩
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