Sc(III) derivatives Many organoscandium(III) compounds have at least one
cyclopentadienyl-type
ligand. The reaction of scandium trichloride with two equivalents of
sodium cyclopentadienide (NaCp) produces the chloride-bridged dimer: :2ScCl3 + 4NaCp → [Cp2Sc(μ-Cl)]2 + 4NaCl Cp3Sc is a polymer wherein one third of the Cp ligands serving as
bridging ligands. Bulkier cyclopentadienide ligands give monoscandium derivatives, e.g. (C5Me5)2ScCl. The corresponding alkyls polymerize alkenes. The synthesis of a tris(allyl)scandium complex is analogous to the above methods, involving the reaction of ScCl3 with allyl potassium in THF solution, The product is Sc(C3H5)3(THF)2 wherein two allyl ligands are η3 coordinated and one allyl ligand is η1.
Sc(II) and Sc(I) derivatives Organoscandium compounds in lower oxidation states have been prepared. ==References==