Synthesis and spectroscopic properties of 4-(4-carboxyphenyl)-3,3′,5′-trimethyl-2,2′-pyrromethen-1,1′-BF2 complex and its methyl ester

A new, strongly absorbing red dipyrrole chromophore 1 suitable for exciton coupling studies has been synthesized and shown to exhibit an intense absorption (?? 57,000) at λ (max) ?520 nm and a strong fluorescence at λ (em) ?555 nm.