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2 Homometallic Alkoxides

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572<br />

Table 6.25 (Continued)<br />

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

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

[Nb(O)(OAr) 3]<br />

pseudo-tetrahedral, terminal oxo<br />

Oxo and imido aryloxides<br />

OC6H3Ph2-2,6 1.890 (9)<br />

1.878 (7)<br />

154<br />

155<br />

xi<br />

1.921 (8)<br />

146<br />

[Nb⊲ 2-O⊳⊲OAr⊳3]2<br />

oxo-bridges, 5-coord. Nb<br />

OC6H3Pri 2-2,6 1.877 (3)<br />

1.880 (3)<br />

166<br />

174<br />

xii<br />

1.874 (3)<br />

165<br />

[Nb⊲DNMe⊳⊲OAr⊳3⊲NHMe2⊳]<br />

5-coord. Nb<br />

OC6H3Ph2-2,6 1.965 (5)<br />

1.958 (4)<br />

139<br />

163<br />

xiii<br />

Organometallic aryloxides<br />

1.940 (4)<br />

156<br />

[Nb(OAr) 2⊲CH2C6H4Me-4⊳3]<br />

tbp Nb, axial OAr<br />

OC6H3Ph2-2,6 1.915 (2)<br />

1.917 (2)<br />

178<br />

168<br />

xiv<br />

[Nb(OAr) 2Cl2⊲CH2SiMe3⊳]<br />

tbp Nb, axial OAr<br />

OC6HPh4-2,3,5,6 1.880 (3)<br />

1.892 (3)<br />

172<br />

160<br />

v<br />

[Nb(OAr) 2⊲CH2SiMe3⊳3]<br />

tbp Nb, axial OAr<br />

OC6HPh4-2,3,5,6 1.926 (2)<br />

1.932 (2)<br />

156<br />

170<br />

v<br />

[Nb(OAr) 2⊲CH2SiMe3⊳2]<br />

tetrahedral Nb<br />

OC6HPh4-2,3,5,6 1.902 (2)<br />

1.917 (2)<br />

159<br />

154<br />

v<br />

[Nb(OAr)(CO) 2⊲dmpe⊳2]<br />

7-coord. Nb<br />

OC6H3Me2-3,5 2.181 (4) 160 i, ii<br />

[⊲ArO⊳⊲Me3SiCH2⊳Nb⊲ -CSiMe3⊳]2<br />

1,3-dimetallabutadiene core, tetrahedral Nb,<br />

anti-OAr<br />

OC6H3Ph2-2,6 1.909 (3) 167 xv<br />

[Nb⊲OC6H3Ph-C6H4⊳⊲OAr⊳2Cl]<br />

tbp, axial OAr and O of cyclometallated OAr<br />

OC6H3Ph2-2,6 1.872 (3)<br />

1.898 (3)<br />

141<br />

164<br />

xvi<br />

OC6H3Ph- 1 [CpNb(OAr)Cl3 ]<br />

square pyramidal, axial Cp<br />

-C6H4<br />

OC6H2Ph2-2,6-Bu<br />

1.918 (3) 131<br />

t 2-3,5 1.872 (4) 155 iv

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