Rational Synthesis\nof Highly Stable Dithienopyrrole-Embedded\nBODIPYs Exhibiting Large Stokes Shift

A series of dithienopyrrole (DTP) embedded BODIPYs were\nsynthesized\nand structurally characterized. These BODIPYs have strong absorption\nin the green region and broad emission in the red region with a large\nStokes shift ranging from 3100 to 4200 cm<sup>–1</sup>. Interestingly,\nall three BODIPYs show intramolecular charge transfer interaction\n(ICT). Intriguingly, both BODIPYs (<i>bis</i>- and <i>tris</i><b>-BOD</b>) also exhibit excited state symmetry\nbreaking (ES-SB). Single-crystal X-ray analysis unambiguously confirmed\nthe exact structures of all three structurally distinct BODIPYs.