Table 4. Selected bond lengths (in Å), angles (in °) and topology parameters (TP) of the Et3PO-mono and bis-adducts, fluorosilicates and the chlorosilicate of bis(catecholato)silanes as obtained by X-ray diffraction analyses.
| Et3PO–Si(catX)2 | X = H | X = F (unit 1) | X = F (unit 2) | X = Br | (Et3PO)2–Si(catX)2 | X = H | X = F | X = Cl3 | X = Br |
| Si–O5 | 1.709(2) | 1.688(2) | 1.694(2) | 1.702(4) | Si–O3 | 1.863(2) | 1.823(2) | 1.832(1) | 1.836(2) |
| P–O5 | 1.560(2) | 1.544(2) | 1.557(2) | 1.550(3) | P–O3 | 1.526(2) | 1.523(2) | 1.533(1) | 1.535(2) |
| Si–O1 | 1.745(2) | 1.727(2) | 1.746(2) | 1.726(3) | Si–O1 | 1.754(1) | 1.767(2) | 1.766(1) | 1.763(2) |
| Si–O2 | 1.705(2) | 1.733(2) | 1.726(2) | 1.734(3) | Si–O2 | 1.757(1) | 1.768(1) | 1.763(1) | 1.766(2) |
| Si–O3 | 1.737(2) | 1.721(2) | 1.727(2) | 1.713(3) | |||||
| Si–O4 | 1.709(2) | 1.731(2) | 1.725(2) | 1.723(3) | |||||
| O1–Si–O2 | 89.6(1) | 89.5(1) | 89.2(1) | 89.3(2) | O1–Si–O2 | 90.7(1) | 90.8(1) | 90.6(1) | 90.4(1) |
| O3–Si–O4 | 89.8(1) | 89.7(1) | 90.1(1) | 90.3(2) | O1–Si–O2′ | 89.3(1) | 89.3(1) | 89.4(1) | 89.6(1) |
| O1–Si–O4 | 87.0(1) | 86.2(1) | 85.4(1) | 87.1(2) | O2–Si–O3 | 88.5(1) | 88.3(1) | 88.9(1) | 89.0(1) |
| O2–Si–O3 | 87.0(1) | 85.0(1) | 85.6(1) | 84.5(2) | O2′–Si–O3 | 91.4(1) | 91.8(1) | 91.1(1) | 91.0(1) |
| O1–Si–O3 | 170.3(1) | 154.2(1) | 156.8(1) | 158.5(2) | |||||
| O2–Si–O4 | 140.2(1) | 158.3(1) | 155.7(1) | 156.3(2) | |||||
| TP (% tbp) | 0.50 | 0.02 | 0.02 | 0.04 |
| [F-Si(catX)2]– | X = H12 | X = F (Poly A) | X = F (Poly B) | X = Cl3 | X = Br | X = F/Br | [Cl-Si(catX)2]– | X = H |
| Si–F1 | 1.600(8) | 1.600(1) | 1.609(2) | 1.606(1) | 1.610(2) | 1.604(4) | Si–Cl1 | 2.104(2) |
| Si–O1 | 1.767(8) | 1.731(1) | 1.742(2) | 1.731(1) | 1.751(3) | 1.736(4) | Si–O1 | 1.711(4) |
| Si–O2 | 1.746(9) | 1.745(1) | 1.720(2) | 1.738(1) | 1.724(3) | 1.731(4) | Si–O2 | 1.735(4) |
| Si–O3 | 1.686(8) | 1.728(1) | 1.746(2) | 1.739(1) | 1.743(3) | 1.739(5) | Si–O3 | 1.720(3) |
| Si–O4 | 1.720(8) | 1.741(1) | 1.718(2) | 1.738(1) | 1.734(3) | 1.732(4) | Si–O4 | 1.736(4) |
| O1–Si–O2 | 88.9(1) | 89.4(1) | 89.6(1) | 89.1(1) | 89.0(1) | 89.0(2) | O1–Si–O2 | 89.9(2) |
| O3–Si–O4 | 89.5(1) | 89.3(1) | 89.6(1) | 89.0(1) | 89.0(1) | 89.1(2) | O3–Si–O4 | 89.0(2) |
| O1–Si–O4 | 86.4(1) | 85.5(1) | 85.4(1) | 85.7(1) | 84.4(1) | 85.5(2) | O1–Si–O4 | 85.7(2) |
| O2–Si–O3 | 88.0(1) | 86.3(1) | 85.7(1) | 85.6(1) | 87.4(1) | 85.8(2) | O2–Si–O3 | 85.2(2) |
| O1–Si–O3 | 133.1(5) | 149.8(1) | 162.3(1) | 153.7(1) | 160.9(1) | 155.2(2) | O1–Si–O3 | 151.4(2) |
| O2–Si–O4 | 171.2(5) | 161.8(1) | 148.2(1) | 156.5(1) | 148.6(1) | 155.1(2) | O2–Si–O4 | 159.1(2) |
| TP (% tbp) | 0.64 | 0.20 | 0.24 | 0.05 | 0.21 | 0.00 | 0.12 |