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2 Homometallic Alkoxides

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570<br />

Table 6.25 Niobium aryloxides<br />

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

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

[Nb(OAr) 5]<br />

tbp Nb<br />

trans-[Nb(OAr) 2⊲dmpe⊳2]<br />

distorted octahedron<br />

[Nb(OAr) 2(dmpe) 2 ] C [Nb(OAr) 6]<br />

trans OAr in cation, 6-coord. Nb<br />

[Nb(OAr) 2Cl3]<br />

square pyramidal Nb, axial OAr<br />

[Nb(OAr) 2Cl3]<br />

square pyramidal Nb, axial OAr<br />

[Nb(OAr) 2I3]<br />

tbp Nb, axial OAr<br />

[Nb⊲ 2-Cl⊳⊲OAr⊳2Cl2]2<br />

edge-shared bis-octahedron, OAr trans to<br />

bridging chloride groups, 6-coord. Nb<br />

[Nb(OAr)Cl4(THF)] distorted octahedron, THF trans to OAr<br />

Homoleptic aryloxides and adducts<br />

OC6H3Me2-2,6 1.901 (2)<br />

167<br />

i<br />

1.893 (2)<br />

145<br />

1.903 (2)<br />

144<br />

1.890 (2)<br />

169<br />

1.910 (2)<br />

157<br />

OC6H4Me-4 2.023 (3)<br />

156<br />

i<br />

2.022 (3)<br />

171<br />

OC6H3Me2-3,5 1.917 (2)<br />

177<br />

i, ii<br />

1.96 (1)<br />

143<br />

1.95 (1)<br />

150<br />

1.98 (1)<br />

146<br />

1.95 (1)<br />

161<br />

1.94 (1)<br />

153<br />

Mixed aryloxy halides, amides, etc.<br />

1.95 (1)<br />

149<br />

OC6HPh4-2,3,5,6 1.820 (3)<br />

163<br />

iii<br />

1.870 (3)<br />

151<br />

OC6HPh2-2,6-But 2-3,5 1.809 (1)<br />

1.881 (1)<br />

178<br />

141<br />

iv<br />

OC6HPh4-2,3,5,6 1.879 (4) 179 v<br />

OC6H3Pri 2-2,6 1.816 (7)<br />

1.816 (7)<br />

173<br />

169<br />

OC6H3Me2-2,6 1.819 (8) 180 vii<br />

vi

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