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2 Homometallic Alkoxides

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342<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 />

[Li2⊲ 3-OBu t ⊳2⊲ -OBu t ⊳4Sn2] 4 3 – LiO, 2.098, 2.133 (10) ⊲ 3⊳<br />

1.926, 1.933 (8) ⊲ ⊳<br />

SnO, 2.099 (3) ⊲ 3⊳<br />

LiO, 132.1–133.7<br />

SnO, 117.6–122.1<br />

[f⊲thf⊳2Lig2f -O⊲SiPh2O⊳2g2SnCl2] 4 6 –<br />

2.084, 2.095 (3) ⊲ ⊳<br />

LiO, 1.980, 1.998 (13)<br />

SnO, 2.041, 2.053 (4)<br />

– 469<br />

[Na8Eu⊲ 9-Cl⊳⊲ 4-OBu t ⊳⊲ 3-<br />

OBu t ⊳8⊲OBu t ⊳]<br />

41 [Na8Y⊲ 9-OH⊳⊲ 4-OBu<br />

6 Eu, 2.090 (8) NaO, 2.379 ( 4, av.)<br />

2.305 ( 3, av.)<br />

EuO, 2.335 ( 3, av.)<br />

EuO, 178.8 (t) 470<br />

t ⊳⊲ 3-<br />

OBu t ⊳8⊲OBu t ⊳]<br />

41 [Na8Y⊲ 9-Cl⊳⊲ 4-OBu<br />

6 YO, 2.022 (16) NaO, 2.364 ( 4, av.)<br />

2.264 ( 3, av.)<br />

YO, 2.77 ( 3, av.)<br />

YO, 176.3 (t) 470<br />

t ⊳⊲ 3-<br />

OBu t ⊳8⊲OBu t ⊳]<br />

41 [Na3Yf -OCH⊲CF3⊳2g6⊲thf⊳3] 3<br />

6<br />

6<br />

YO, 2.044 (7)<br />

NaO(thf), 2.258 av.<br />

NaO, 2.364 ( 4, av.)<br />

2.284 ( 3, av.)<br />

YO, 2.283 ( 3, av.)<br />

NaO, av. 2.300<br />

YO, av. 2.235<br />

Term. YO, 177.4 (t)<br />

NaO, 116.6–123.5 (b)<br />

YO, 134.1–142.9 (b)<br />

470<br />

471<br />

[Na2Yf -<br />

3<br />

OCMe(CF3⊳2g4fOCMe(CF3⊳2g⊲thf⊳3] 1 6 NaO(thf), 2.338 av. NaO, av. 2.598<br />

YO, 169.6 (t)<br />

471<br />

YO (alkoxo), 2.150 (4) YO, av. 2.234<br />

YO(thf) 2.425 (4)<br />

(thf), av. 127.8<br />

NaO, 108.5–115.1 (b)<br />

YO, 152.1–163.2 (b)<br />

[⊲dme⊳2Na2⊲ 3-OBu t ⊳2⊲ -<br />

OBu t ⊳2Ce(OBu t ⊳2]<br />

5 6 NaO(dme), 2.582 av.<br />

CeO, 2.141 av.<br />

NaO, 2.384 ( 3, av.)<br />

2.354 ( ,av.)<br />

CeO, 2.373 ( 3, av.)<br />

2.230 ( ,av.)<br />

CeO, 172.6 (t)<br />

NaO, 123.9 ( 3, b)<br />

119.3 ( ,b)<br />

CeO, 134.1 ( 3, b)<br />

149.3 ( ,b)<br />

472<br />

468

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