Second harmonic generation signatures of supramolecular assemblies based on amide moieties

Tárcius N. Ramos, Laura Le Bras, Yves L. Dory, Benoît Champagne

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Targeting the use of the second harmonic generation (SHG) as a bioimaging technique to unravel the formation of aggregates, the SHG first hyperpolarizabilities ((Figure presented.)) of assemblies of benzene-1,3,5-tricarboxamide derivatives have been evaluated at the density functional theory level. Calculations have revealed that i) the assemblies exhibit SHG responses and the total first hyperpolarizability responses of the aggregates are evolving with their size. The largest aggregation effect is a 18-times increase for (Figure presented.) of B4 when going from the monomer to the pentamer, that ii) the intrinsic SHG responses described by the hyper-Rayleigh Scattering (Figure presented.) are enhanced in presence of iodine atoms on the phenyl core, that iii) the side chains affect the relative orientation of the dipole moment and first hyperpolarizability vectors, which impacts more the EFISHG quantities than their moduli, and that iv) the radial component to (Figure presented.) is dominant for the compounds having the largest responses. These results have been obtained using the sequential molecular dynamics then quantum mechanics approach to account for dynamic structural effects on the SHG responses.

langue originaleAnglais
Numéro d'articlee202300150
Pages (de - à)e202300150
Numéro de publication13
Les DOIs
Etat de la publicationPublié - 3 juil. 2023

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