Ball and stick drawing of the X-ray crystallographic molecular structure of8. Hydrogen atoms are omitted for clarity. Selected bond lengths [A], bond angles [], and dihedral angles []: Sn1-Si1 2.599(11), Sn1-Si2 2.592(11), Sn1-Li1 2.816(7), Sn1-Li2' 2.779(7), Sn1-Li2 2.811(6), Li1-Li2 2.774(10), Li2-Sn1' 2.779(7), Li2-Li2' 2.863(13), Si1-Sn1-Li1 99.9(17), Si1-Sn1-Li2 124.3(17), Si1-Sn1-Li2' 127.9(16), Si2-Sn1-Si1 109.8(3), Si2-Sn1-Li1 87.4(16), Si2-Sn1-Li2 118.8(17), Si2-Sn1-Li2' 106.3(17), Li2-Sn1-Li1 59.1(2), Li2'-Sn1-Li1 118.0(2), Li2'-Sn1-Li2 61.6(2), Li2-Li1-Sn1 60.3(19), Sn1'-Li2-Sn1 118.4(2), Sn1'-Li2-Li2' 59.7(3), Sn1-Li2-Li2' 58.7(2), Li1-Li2-Sn1' 163.4(4), Li1-Li2-Sn1 60.5(19), Li1-Li2-Li2' 116.6(4); Sn1-Li2-Sn1'-Li2' 0(0).