Enhancing Near-Infrared Two-Photon Absorption of Aza-Boron-Dipyrromethene Compounds Through Intramolecular Charge Transfer Via Electron Donating Substitution.

ABSTRACT: The nonlinear optical properties of aza-borondipyrromethene (aza-BODIPY) derivatives modified with 4-methoxyphenyl, 2,4-dimethoxyphenyl, and 4-N,N-diphenylaminophenyl groups at the 1 and 7 positions of the core structure are evaluated. The effects of substituents and solvent polarity (tetrahydrofuran (THF) and chloroform (CHCl₃₎) on the linear absorption and fluorescence properties are systematically investigated. The target aza-BODIPYs exhibit higher absorption in CHCl₃ compared to THF. While solvent polarity exerted a minimal effect on the absorption and fluorescence intensity, the fluorescence in BOD2 and BOD3 is markedly quenched as a result of the electron-donating methoxy groups and the pronounced intramolecular charge transfer (ICT) characteristics of the diphe

SUBMITTER: Dogan A 

PROVIDER: S-EPMC12509488 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature