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2 Homometallic Alkoxides

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528<br />

Table 6.19 (Continued)<br />

Bond length ( ˚A) Bond angle ( Ž )<br />

Compound Aryloxide M–O M–O–Ar Ref.<br />

[CpSm(OAr)(fluorenone ketyl)(HMPA)]<br />

pseudo-tetrahedral Sm<br />

OC6H2But 2-2,6-Me-4 2.158 (6) 174 xlv<br />

[fSm⊲OAr⊳2⊲OEt2⊳g2⊲m-fluorenone pinacolate⊳] OC6H2But 2-2,6-Me-4 2.115 (3)<br />

2.141 (5)<br />

160<br />

173<br />

xliii, xlv<br />

[⊲ArO⊳⊲thf⊳3Sm⊲ -I⊳2Sm⊲OAr⊳⊲THF⊳3]<br />

6-coord. Sm, OAr trans to -I<br />

OC6H2But 2-2,6-Me-4 2.300 (10) 179 xliv<br />

[⊲ArO⊳2⊲thf⊳Sm⊲ -Cl⊳2Sm⊲OAr⊳2⊲THF⊳]<br />

5-coord. Sm, square pyramid with axial OAr<br />

OC6H2But 2-2,6-Me-4 2.135 (6)<br />

2.110 (7)<br />

165<br />

167<br />

xliv<br />

[Cp Ł Sm⊲OAr⊳⊲hmpa⊳2]<br />

psuedo-tetrahedral Sm<br />

OC6H2But 2-2,6-Me-4 2.345 (4) 164 xliv<br />

[Sm⊲OAr⊳2⊲I⊳⊲thf⊳2]<br />

tbp, axial THF<br />

OC6H2But 2-2,6-Me-4 2.153 (7) 164 xliv<br />

[Cp Ł Sm⊲ -OAr⊳2SmCp Ł ] 2-OC6H2But [Cp<br />

3-2,4,6 2.425 (5), 2.512 (6) xlvi<br />

Ł<br />

2Sm⊲OAr] possible agostic Sm–methyl interaction<br />

2-OC6H2But 3-2,4,6 2.144 (5) 166 xlvi<br />

[( , 5-Cp Ł ⊳Sm⊲OAr⊳⊲ , 5-Cp Ł ⊳K⊲thf⊳2]1<br />

infinite chain polymer<br />

2-OC6H3But 2-2,6 2.29 (2) 175 xlvi<br />

[⊲ , 5-Cp Ł ⊳Sm⊲OAr⊳⊲ , 5-Cp Ł ⊳K⊲thf⊳2]1<br />

possible agostic Sm–methyl interaction<br />

2-OC6H2But 2-2,6-Me-4 2.330 (6) 127 xlvi<br />

[Eu⊲OAr⊳2⊲THF⊳3].THF<br />

tbp, axial THF<br />

OC6H2But 2-2,6-Me-4 2.321 (5)<br />

2.337 (5)<br />

174<br />

175<br />

xlvii<br />

[Eu⊲OAr⊳2⊲NCMe⊳4]<br />

distorted octahedron<br />

OC6H3But 2-2,6 2.313 (12)<br />

2.35 (2)<br />

174<br />

175<br />

xlviii<br />

[Eu⊲ 2-OAr⊳3Eu⊲OAr⊳].toluene<br />

Contains three 1-Ph–Eu and three 2 contacts<br />

-Ph–Eu<br />

OC6H3Ph2-2,6<br />

2-OC6H3Ph2-2,6<br />

2.361 (3)<br />

2.493 (2), 2.463 (3)<br />

2.517 (3), 2.426 (3)<br />

2.428 (2), 2.438 (2)<br />

155 xlix

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