Abstract
The dipyrrin–metal complexes and especially the boron complex 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) have recently attracted considerable attention because of their interesting properties and possible applications. We have developed two unique and useful ways to extend versatility and usefulness of the dipyrrin complexes. The first one is the linear and macrocyclic oligomerization of the BODIPY units. These arrangements of the B–F moieties of the oligomerized BODIPY units provide sophisticated functions, such as unique recognition ability toward cationic guest, associated with changes in the photophysical properties by utilizing unprecedented interactions between the B–F and a cationic species. The second one is introduction of additional ligating moieties into the dipyrrin skeleton. The multidentate N2Ox dipyrrin ligands thus obtained form a variety of complexes with 13 and 14 group elements, which are difficult to synthesize using the original N2 dipyrrin derivatives. Interestingly, these unique complexes exhibit novel structures, properties, and functions such as guest recognition, stimuli-responsive structural conversion, switching of the optical properties, excellent stability of the neutral radicals, etc. We believe that these multifunctional dipyrrin complexes will advance the basic chemistry of the dipyrrin complexes and develop their applications in the materials and medicinal chemistry fields.
1 Introduction
2 Linear Oligomers of Boron–Dipyrrin Complexes
3 Cyclic Oligomers of Boron–Dipyrrin Complexes
4 A Cyclic Oligomer of Zinc–Dipyrrin Complexes
5 Group 13 Element Complexes of N2Ox Dipyrrins
6 Chiral N2 and N2Ox Dipyrrin Complexes
7 Group 14 Element Complexes of N2O2 Dipyrrins
8 Other N2O2 Dipyrrin Complexes with Unique Properties and Functions
9 Conclusion
Key words
dipyrrin - BODIPY - guest recognition - fluorescence - oligomer - multidentate ligand - complex of 13 and 14 group elements
