Tetrabenzotriazaporphyrins: synthesis, properties and application

Synthetic approaches to tetrabenzotriazaporphyrins and their complexes with metals and semimetals (P, Si) are considered. Methods for complexation of free-base tetrabenzotriazaporphyrin ligands and the preparation of water-soluble derivatives via the introduction of a sulfo group are analyzed. Particular attention is given to investigations of this class of compounds by electronic absorption spectroscopy and possibilities of their practical application. The bibliography includes 80 references.