Reactivity of samarium complex (C5Me5)2Sm(.mu.-H)2 in ether and arene solvents. X-ray crystal structures of the internally metalated complex (C5Me5)2Sm(.mu.-H)(.mu.-CH2C5Me4)Sm(C5Me5), the benzyl complex (C5Me5)2Sm(CH2C6H5)(THF), and the siloxide complex (C5Me5)2Sm(THF)2(.mu.-OSiMe2OSiMe2O) | Synapse