Table 7: Bond angles for 1, X2.

Atom 1Atom 2Atom 3Angle (deg)

O1Si1O4109.0 (2)
O1Si1O6108.6 (1)
O1Si1C4110.5 (2)
O4Si1O6108.7 (2)
O4Si1C4110.9 (2)
O6Si1C4109.1 (2)
O2Si2O3108.9 (2)
O2Si2O7109.1 (2)
O2Si2C1109.7 (2)
O3Si2O7108.6 (1)
O3Si2C1110.0 (2)
O7Si2C1110.4 (2)
O3Si3O4109.2 (1)
O3Si3O7109.4 (1)
O3Si3C2110.0 (2)
O4Si3O7107.9 (2)
O4Si3C2111.2 (2)
O7Si3C2109.2 (2)
O1Si4O2109.0 (2)
O1Si4O5109.0 (2)
O1Si4C3109.8 (2)
O2Si4O5105.3 (2)
O2Si4C3112.1 (2)
O5Si4C3111.4 (2)
Si1O1Si4151.5 (2)
Si2O2Si4144.1 (2)
Si2O3Si3145.5 (2)
Si1O4Si3153.9 (2)
Si1O6Si1146.8 (3)
Si2O7Si3153.3 (2)