5 BODIPY Dyes and Their Analogues
157
Fig. 5.39 Absorption and fluorescence properties of fused aza-BODIPY dyes
5.2.4 BODIPY Analogue
5.2.4.1 Pyridomethene Boron Complex
A pyridomethene-BF 2 complex is a six-membered ring analogue of a BODIPY
dye. The pyridomethene-BF 2 complex was first reported around 1970 (Scheibe
et al. 1969; Douglass et al. 1973), but it was hardly studied until the detailed
optical properties were reported by the author in 2010 (Fig. 5.40a) (Kubota et al.
2010a). The pyridomethene-BF 2 complex 63 is synthesized from the reaction of
2-cyanomethylpyridine and 2-bromopyridines and subsequent boron-complexation.
The pyridomethene-BF 2 complex shows blueshifted λ max and F max compared with