Abstract
Abstract Mono- and bis-dialkylaminophenylbuta-1,3-dienyl boron-dipyrromethenes (BODIPYs) 1–12 were synthesized in 36%–42% yields by a Knoevenagel-type condensation. The absorption and emission maxima (λabs = 614–739 nm; λem = 655–776 nm in CHCl3) of 1–12 covered from the visible to the near-infrared region. Probe 1 was ratiometric Vis pH probes. Such probe was almost non-fluorescent. Upon the protonation of the tertiary amine function of 1, the strong fluorescence (Φf = 0.97) was released and the florescence intensity was dramatically increased by one thousand folds. The sharp isosbestic points were discovered at 590 nm, which was a ratiometric pH probe.
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