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2 Homometallic Alkoxides

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344<br />

Table 4.17 (Continued)<br />

Coordination no.<br />

Alkali<br />

metal<br />

Other<br />

metal<br />

M–O Bond lengths ( ˚A)<br />

Bond angles ( Ž )<br />

Compound (M) (M0 ) Terminal Bridging MOC � Reference<br />

[Na2⊲ 3-OBu t ⊳2⊲ -OBu t ⊳4Zn2] 3 4 – NaO, 2.427 (5) ⊲ 3⊳<br />

2.226 (3) ⊲ ⊳<br />

ZnO, 2.050 (2) ⊲ 3⊳<br />

1.892 (4) ⊲ ⊳<br />

[Na2⊲ 3-OBu t ⊳2⊲ -OBu t ⊳4Sn] 4 3 – NaO, 2.271–2.414<br />

[K⊲ 3-OBu t ⊳2⊲ -OBu t ⊳3U2⊲OBu t ⊳4] 4 6 UO, 2.10–2.14 (2)<br />

av. 2.122<br />

SnO, 2.095–2.111<br />

KO, 2.93, 2.94 (2) ⊲ 3⊳<br />

2.74, 2.76 (2) ( 2)<br />

UO, 2.43 ( 3, av.)<br />

2.26 ( ,av.)<br />

[K⊲ 3-OPr i ⊳⊲ -OPr i ⊳3Ti⊲OPr i ⊳] 5 5 1.814 (1) KO, 2.784 (1) ⊲ 3⊳<br />

2.820 ( ,av.)<br />

TiO, 1.979 (1) ⊲ 3⊳<br />

1.876 ( ,av.)<br />

[(py) 2K2⊲ -OCH2But⊳8Mo2] 5 51 – KO, av. 2.745<br />

MoO, av. 1.997<br />

[(py) 2K2⊲ -OCH2But⊳8W2] 5 51 – KO, av. 2.770<br />

WO, av. 1.998<br />

[K2⊲ 3-OBu t ⊳2⊲ -OBu t ⊳4Zn2] 3 4 – KO, 2.771 (5) ⊲ 3⊳<br />

2.556 (4) ⊲ ⊳<br />

ZnO, 2.038 (3) ⊲ 3⊳<br />

[⊲Pr i OH⊳2K⊲ -OPr i ⊳4Al]1 6 4 ⊲Pr i OH⊳K, 2.668,<br />

2.725 (8)<br />

1.899 (5) ⊲ ⊳<br />

KO, 2.695–3.136 (6)<br />

av. 2.898<br />

AlO, 1.713–1.776 (6)<br />

av. 1.743<br />

ZnO, 126.9 ( 3, b)<br />

130.8, 136.1 ( ,b)<br />

NaO, 126.7–130.3<br />

SnO, 118.8–123.1<br />

UO, 168–175 (t)<br />

UO, 126–128 ( 3, b)<br />

127–153 ( ,b)<br />

479<br />

468<br />

151<br />

– 473<br />

– 259<br />

– 259<br />

ZnO, 127.0 ( 3, b)<br />

134.4, 1.38.4 ( ,b)<br />

479<br />

– 480

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