Crystal and molecular structures of the octanuclear aluminohydride samarium complex (η5-C5H3tBu2)Sm2 5-C5H3tBu2)SmH>25-C5H3tBu2)2>

Article abstract of DOI:10.1016/0022-328X(91)86443-T

The reaction of (C5H4^tBu2)2Sm with AlH3 in ether or (C5H4^tBu2)2Sm*THF with AlH3 in THF in the presence of excess of TMEDA and pentane inolves the oxidation of Sm(2+) to Sm(3+), partial loss of Cp''-ligands and formation of the octanuclear complex Cp5''Sm4(AlH4)3*2Me2NC2H4NMe2, the cyclic metal core of which resembles a sitting frog.Atoms Sm1, Sm3 and Sm4 are coordinated with one Cp''-ligand each, while Sm2 is bonded with two Cp''-ligands.All metals of the complex are bonded by μ2- and μ3-bridging hydrogens.