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2 Homometallic Alkoxides

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584<br />

Table 6.27 Chromium aryloxides<br />

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

Compound Aryloxide M–O M–O–Ar Reference<br />

trans-[Cr(OAr) 2(THF) 2]<br />

Homoleptic aryloxides and adducts<br />

OC6H2But square planar Cr<br />

2-2,6-Me-4 1.948 (2) 148 i<br />

trans-[Cr(OAr) 2(py) 2 ] OC6H2But square planar Cr<br />

3-2,4,6 1.952 (2) 143 ii<br />

[Cr(OAr) 3]<br />

6-coord. Cr, mer-O<br />

OC6H4(2-py)-2 1.922 (6)<br />

1.922 (5)<br />

122<br />

121<br />

iii<br />

1.957 (6)<br />

123<br />

[Cr(OAr) 2][PF6]<br />

6-coord. Cr, cis-O<br />

OC6H4(2-bipy)-2 1.895 (10)<br />

1.882 (10)<br />

123<br />

123<br />

iii<br />

[(THF) 2⊲ 3-OAr⊳Li⊲ 3-OAr⊳3Cr⊲ 2-OAr⊳]2<br />

two CrLi3O4 cubes linked by two ( 2-OAr) between<br />

Cr atoms<br />

2-OC6H5<br />

3-OC6H5<br />

2.007 (4), 2.006 (4)<br />

Li–O–Cr<br />

1.99 (1), 2.050 (4)<br />

1.97 (1), 2.365 (4)<br />

1.97 (1), 2.061 (4)<br />

iv<br />

[(THF) 2Li⊲ 2-OAr⊳2Cr⊲ 2-OAr⊳2Cr⊲ 2-OAr⊳2Li(THF) 2] 2-OC6H3Me2-2,6<br />

tetrahedral Cr 2.004 (3)<br />

Cr–O–Cr<br />

Li–O–Cr<br />

iv<br />

1.945 (9), 1.987 (3)<br />

1.92 (1), 1.988 (3)

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