This review is focused on the BODIPY bichromophores and their oligomeric derivatives, the features of their structural, photophysical and photochemical characteristics, as well as the possibilities of their potential practical application. The physicochemical properties of BODIPY dimers/oligomers have a number of unique features that distinguish them from monochromophoric boron(III) dipyrromethene dyes. Structural factors, primarily the dihedral angles between BODIPY subunits, determine the photophysical behavior of bi/oligo-BODIPYs, in particular the dipole-dipole interactions of chromophore moieties, the efficiency of intra/intermolecular exciton coupling, the possibility of intersystem crossing with spin-orbit charge transfer (SOCT-ISC) and the ability to exhibit heavy-atom-free photosensitizer (PS) properties. A characteristic feature of most bi/oligochromophore BODIPY luminophores and photosensitizers is their high sensitivity of both fluorescence and photosensitization efficiency to solvent polarity. Finally, key examples of directly linked, spacer-separated, π-fused BODIPY bi/oligomers and potential applications of materials based on them, from energy conversion to medicine, are presented.
