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2 Homometallic Alkoxides

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400<br />

Table 5.3 Scandium, yttrium, lanthanide, and actinide-containing oxo-alkoxides (including heterometallic compounds)<br />

Metal Oxo M–oxo bond Mx–oxo<br />

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

[Li8K2⊲O⊳⊲OBu t ⊳8⊲tmeda⊳2] 3, 4 (Li) 8 3-coord. Li, 1.895 (av.) Li2O, 61.2–151.3 94<br />

tmeda D Me2NC2H4NMe2 4 (K) 4-coord. Li, 2.195 (av.)<br />

[Li4Ti4⊲ 5-O⊳2⊲ -O⊳2⊲OPr i ⊳12] 4 (Li) 5, 5 2.039 (av.) 5, 87.3–174.0 95<br />

5, 6 (Ti) 1.864 (av.) 2, 107.0<br />

[Na2Mo4⊲O⊳6⊲ -O⊳2⊲OPr i ⊳12] 5 (Na) t, , 1.722 (Mo), 2.256 (Na) MoONa, 144.5 96<br />

6(Mo) Mo(O) 2, 1.691 (3)<br />

MoO, 1.715 (3)<br />

[Na2W2⊲O⊳2⊲OEt⊳14] 6, 6 t WO, 1.72 (2) – 97<br />

[Na4Zr6⊲O⊳2⊲OEt⊳24] 5 (Na) 5 NaO, 2.666, 3.018 (6) NaOZr, 89.4, 163.1 98<br />

6 (Zr) ZrO, 2.169, 2.169, 2.186 (5) Zr2O, 104.3 (av.)<br />

[K4Sb2⊲ 6-O⊳⊲OBu t ⊳8⊲thf⊳4] 6 (K) 6 SbO, 2.004 (5) Sb2O, 107.1 99<br />

5 (Sb) KO, 3.047 (8) SbOK, 91.8–97.2, 161.1<br />

K2O, 69.3–80.9, 156.1<br />

[K4Sb4⊲ 4-O⊳2⊲OPr i ⊳12] 6 (K) 4 SbO, 1.982 (5) Sb2O, 105.8 99<br />

5 (Sb) KO, 2.693 (5) SbOK, 104.3–105.2<br />

K2O, 130.1<br />

[Mg 2 Mo2⊲O⊳2⊲OMe⊳10⊲MeOH⊳4] 6, 6 t MoO, 1.685 (4) – 100<br />

[Ca6⊲ 4-O⊳2⊲ 3-OEt⊳4⊲OEt⊳4⊲EtOH⊳6] 6 4 CaO, 2.402–2.529 (5) – 101<br />

[H3Ba6⊲ 5-O⊳⊲OBu t ⊳11⊲OCEt2CH2O⊳⊲thf⊳3] 6, 5 5 BaO, 2.74–2.86 (1) – 102<br />

av. 2.79<br />

[H4Ba6⊲ 6-O⊳⊲OC2H4OMe⊳14] 8 6 BaO, 2.90–2.93 – 103<br />

[Ba5⊲ 5-O⊳⊲hfip⊳8⊲hfipH⊳⊲thf⊳4⊲H2O⊳] 6, 7 5 BaO 2.87 (3) – 104<br />

hfip D OCH⊲CF3⊳2<br />

[Ba2Y4⊲ 6-O⊳⊲ 3-OEt⊳8⊲Bu t COCHCOBu t ⊳6] 7, 7 6 BaO, 3.027 (2) – 105<br />

[Ba2Ti4⊲ 3-O⊳⊲ 3-OMe⊳6⊲ -<br />

OMe⊳2⊲OMe⊳10⊲MeOH⊳7]<br />

9(Ba)<br />

6(Ti)<br />

3<br />

YO, 2.363, 2.378 (3)<br />

BaO, 2.615, 2.706 (6)<br />

TiO, 1.695 (6)<br />

Ba2O, 102.6 22

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