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2 Homometallic Alkoxides

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348<br />

Table 4.18 Bimetallic alkoxides of magnesium, calcium, strontium, and barium<br />

Coordination no.<br />

Mg, Ca, Other<br />

M–O Bond lengths ( ˚A)<br />

Bond angles ⊲Ž⊳ Compound Sr, Ba metal Terminal Bridging MOC � Reference<br />

[L2Mg⊲ -OMe⊳4Al2Me4] 6 4 – MgO, 2.05, 2.06 (1) MgO, 139.9, 141.5 (b) 485<br />

L D 2-dioxane AlO, 1.80, 1.86 (1) AlO, 121.2, 121.3 (b)<br />

[⊲ -Cl⊳Mg⊲ 3-OEt⊳2⊲ -OEt⊳⊲ -<br />

Cl⊳Ti2⊲ -OEt⊳⊲OEt⊳4]2<br />

6 6 TiO, 1.753–1.770 (5)<br />

av. 1.760<br />

MgO, 2.088, 2.109 (4) ⊲ 3⊳<br />

2.041 ⊲ ⊳<br />

TiO, 2.100–2.177, ⊲ 3⊳<br />

av. 2.134<br />

1.904–2.044 (4) ( )<br />

av. 1.974<br />

– 486<br />

[Ge⊲ -OBu t ⊳3Mg⊲ -OBu t ⊳3Ge] 6 3 – MgO, 2.119 (4)<br />

GeO, 1.899 (3)<br />

– 487<br />

[Ge⊲ -OBu t ⊳3Ca⊲ -OBu t ⊳3Ge] 6 3 – CaO, 2.36 (1)<br />

GeO, 1.903 (10)<br />

– 487<br />

[Sn⊲ -OBu t ⊳3Ca⊲ -OBu t ⊳3Sn] 6 3 – CaO, 2.37 (1)<br />

SnO, 2.087 (9)<br />

– 487<br />

[Sn⊲ -OBu t ⊳3Sr⊲ -OBu t ⊳3Sn] 6 3 – SrO, 2.523 (3)<br />

SrOC, 142.8<br />

487<br />

SnO, 2.078 (3)<br />

SnOC, 124.9<br />

[Pb⊲ -OBu t ⊳3Sr⊲ -OBu t ⊳3Pb] 6 3 – SrO, 2.47 (2)<br />

PbO, 2.21 (2)<br />

– 487<br />

[Pb⊲ -OBu t ⊳3Ba⊲ -OBu t ⊳3Pb] 6 3 – BaO, 2.73 (3)<br />

PbO, 2.22 (3)<br />

– 487<br />

[⊲ButO⊳Sn⊲ -OBu t ⊳2Mg⊲ -OBu t ⊳]2 4 3 SnO, 2.009 (4) MgO, 1.958–1.969 (3)<br />

av. 1.964<br />

SnO, 2.125, 2.129 (3)<br />

– 523<br />

[Srf⊲ -OBu t ⊳3SnFe(CO) 4g2] 6 4 and 5 – SrO, 2.550 (6)<br />

SnO, 2.027 (6)<br />

– 524<br />

[Baf⊲ -OBu t ⊳3SnCr(CO) 5g2] 6 4 and 6 – BaO, 2.705 (6)<br />

SnO, 2.034 (5)<br />

– 524

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