A silsesquioxane is an organosilicon compound with the chemical formula [RSiO3/2]n (R = H, alkyl, aryl or alkoxyl). Silsesquioxanes are colorless solids that adopt cage-like or polymeric structures with Si-O-Si linkages and tetrahedral Si vertices.
The 2,2'-bipyridine ligand has been extensively used as a metal chelating ligand due to its robust redox stability and ease of functionalization. In contrast to other ligands, such as catechol, which is dianionic, and derivatives of the acetylacetonate ion, which are monoanionic, 2,2'-bipyridine is a neutral ligand. It thus forms charged complexes with metal cations, and this property has been exploited in the design and synthesis of metal-bipyridine complexes. Ligands containing two or more 2
Borane and carborane derivatives have been supplied over kilograms. Most of them are available from UCHEM warehouse.