Compounds with low-valent group 13 metals as ligands for electron poor main group and transition metals

The application of low-valent group 13 metal compounds as ligands in coordination chemistry results in the formation of new metal-to-metal bonds. Traditionally, the coordination chemistry of these compounds was focused on late transition metals. This article now reviews recent progress of the coordination chemistry of compounds with low-valent group 13 metals in the chemistry of electron poor main group and transition metal as well as in f-block elements.