2 Homometallic Alkoxides

564
Table 6.24 Vanadium aryloxides
Bond length ( ˚A) Bond angle ( Ž )
Compound Aryloxide M–O M–O–Ar Ref.
[V2⊲ 2-OAr⊳2⊲OAr⊳4⊲THF⊳]
4- and 5-coord. V
Homoleptic aryloxides and adducts
OC6H3Me2-2,6 1.818 (4)
1.836 (4)
154
140
i
1.842 (4)
158
1.831 (3)
135
2-OC6H3Me2-2,6 1.999 (4), 1.972 (3)
1.926 (3), 2.084 (4)
[V(OAr) 3⊲py⊳2]
tbp V, axial py
OC6H3Me2-2,6 1.870 (3)
1.861 (3)
137
150
i
1.869 (3)
131
[V(OAr) 2⊲py⊳2]
square planar V
OC6H2But 2-2,6-Me-4 1.916 (2) 156 ii
[V(OAr) 2⊲TMEDA⊳]
6-coord. V, chelating 2OMe phenoxides
OC6H4OMe-2 2.068 (4)
2.105 (3)
121
123
ii
[V(OAr) 2⊲TMEDA⊳]
distorted 4-coord. V
OC6H3Ph2-2,6 2.000 (3)
2.038 (3)
142
138
ii
[V(OAr) 2⊲py⊳3]
square pyramidal V, axial py
OC6H3Ph2-2,6 2.025 (4) 146 ii
[⊲DME) 3Li3⊲ 2-OAr⊳6V]
octahedral V
2-OC6H5 Li–O–V
1.878 (3), 2.007 (1)
1.902 (3), 2.021 (1)
iii
[(THF)Li⊲ 2-OAr⊳2V(OAr) 2]
two independent molecules, 4-coord. V
OC6H3Pri 2-2,6 2-OC6H3Pri 2-2,6 1.820 (2)
1.843 (2)
146
146
iii