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2 Homometallic Alkoxides

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402<br />

Table 5.3 (continued)<br />

Metal Oxo M–oxo bond Mx–oxo<br />

Compound coord. coord. lengths ( ˚A) bond angles ( Ž ) Reference<br />

[Gd6⊲ 4-O⊳⊲ 3-OR⊳4⊲ -OR⊳8⊲OR⊳4]<br />

R D C2H4OMe<br />

[Ce4⊲ 4-O⊳⊲ 3-OPr<br />

7, 8 4 8-coord. GdO, 2.173, 2.220 (8)<br />

7-coord. GdO, 2.275, 2.305 (8)<br />

102.3–113.0<br />

av. 109.5<br />

62<br />

i ⊳2⊲ -OPri⊳4⊲OPr i ⊳7⊲PriOH⊳] 6, 7 4 7-coord. CeO, 2.483 (5)<br />

6-coord. CeO, 2.242 (2)<br />

97.4, 99.0, 99.2, 152.3 42<br />

[Ce4⊲ 4-O⊳⊲ 3-OPr i ⊳2⊲ -OPr i ⊳4⊲OPr i ⊳8] 6, 7 4 7-coord. CeO, 2.52 (1)<br />

6-coord. CeO, 2.19, 2.22 (1)<br />

97.8, 98.5, 98.5, 98.6,<br />

100.9, 153.6<br />

67<br />

[Pr8⊲ 4-O⊳⊲ 3-OR⊳4⊲ -OR⊳10⊲OR⊳2⊲OPMe3⊳2]<br />

R D C2H4OMe<br />

[Sm4Ti⊲ 5-O⊳⊲ 3-OPr<br />

8 4 PrO, 2.276–2.330 (5),<br />

2.488–2.762 (5)<br />

102.5–115.8, 95.6, 161.7 63<br />

i ⊳2⊲ -OPr i ⊳6⊲OPr i ⊳6] 6 (Sm)<br />

5(Ti)<br />

5 SmO, 2.58, 2.70 (2)<br />

TiO, 1.85 (2)<br />

Sm2O, 84.1, 84.3, 91.0,<br />

163.4<br />

SmOTi, 98.3, 134.5<br />

113<br />

[Li8Y8⊲ 4-O⊳2⊲ 3-OBu t ⊳4⊲ -OBu t ⊳12⊲ -<br />

Cl⊳4⊲OBu t ⊳8]<br />

[Gd2Zr6⊲ 4-O⊳2⊲ -OPr<br />

6(Y)<br />

2, 3 (Li)<br />

4 YO, 2.40, 2.44, 2.47, 2.52 (2) Y2O, 96.5, 179.1 114<br />

i ⊳10⊲ -OAc⊳6⊲OPr i ⊳10] 6 (Zr)<br />

7 (Gd)<br />

4 GdO, 2.421 (8)<br />

ZrO, 2.151, 2.180, 2.195 (8)<br />

Zr2O, 103.5, 105.0, 137.3<br />

ZrOGd, 102.0, 102.2, 102.2<br />

115<br />

[La2Mo4⊲O⊳4⊲ 4-O⊳4⊲ -OPr i ⊳8⊲OPr i ⊳6] 8 (La)<br />

6(Mo)<br />

t, 4 LaO, 2.728 (3)<br />

MoO4, 1.813 (4)<br />

M D O, 1.696 (5)<br />

– 116<br />

[U3⊲ 3-O⊳⊲ 3-OBu t ⊳⊲ -OBu t ⊳3⊲OBu t ⊳6]<br />

[U3⊲O⊳2⊲ -O⊳2⊲ -OBu<br />

6 3 UO, 2.27 (3) – 117<br />

t ⊳2⊲OBu t ⊳8] 6 t, UO, 1.753 (6) (t)<br />

UO, 1.923, 2.301 (6) (bs)<br />

– 64<br />

[UO2⊲OBu t ⊳2⊲Ph3PO⊳2] 6 t UO, 1.789, 1.795 (6) (t) – 44<br />

ap D apical, ax D axial, bs D basal, eq D equatorial, t D terminal.<br />

1 Coordination no. doubtful. 2 Randomized Y4Pr atoms.

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