Synthesis, spectral, electrochemical and anion binding properties of 3,5-bis(dipyrromethanyl) boron-dipyrromethenes

Abstract

Four new boron-dipyrromethenes (BODIPYs) containing dipyrromethanyl substituents at 3,5-positions, bis(3,5-dipyrromethanyl) BODIPYs 5–8, were synthesized by treating their corresponding 3,5-diformyl BODIPYs 1–4 with excess pyrrole under mild acid catalyzed reaction conditions. The compounds 5–8 are stable and freely soluble in common organic solvents. One-dimensional, two-dimensional NMR, high resolution mass spectrometry (HRMS), absorption, fluorescence and electrochemical techniques were used to characterize the compounds. The spectral and electrochemical studies indicated that dipyrromethanyl groups at 3,5-positions of BODIPY are less electron deficient compared to formyl groups at the same positions. The anion binding studies indicated that bis(3,5-dipyrromethanyl) BODIPY compounds containing four pyrrole NH groups showed preferential binding with F^– ion over other anions, as confirmed by using NMR, fluorescence and electrochemical studies.