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2 Homometallic Alkoxides

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288 Alkoxo and Aryloxo Derivatives of Metals<br />

Figure 4.43 Mo4⊲ -F⊳4⊲OC⊳8<br />

core structure of [Mo4⊲ -<br />

F⊳4⊲OBu t ⊳8] (CH3 groups<br />

omitted).<br />

Figure 4.44 Structure of<br />

[Mo4⊲ -OPr i ⊳8Cl4] (Hatoms<br />

omitted).<br />

Mo–Mo (3.41 ˚A). The two halves of this centrosymmetric molecule are joined by an<br />

isopropoxo and a fluoride bridge. 264<br />

In the novel tetranuclear nitrido complex [Mo4⊲ 3-N⊳2⊲ -OPr i ⊳2⊲OPr i ⊳10] thereisa<br />

zig-zag chain of four Mo atoms all in one plane which includes the two bridging Pr i O<br />

ligands and two terminal isopropoxides. 265 The mixed alkoxide [Mo4⊲ -OMe⊳2⊲ -<br />

OPr i ⊳2⊲OPr i ⊳8] has two nonbridged Mo Mo (2.238 ˚A) units joined by methoxo and<br />

isopropoxo bridges in a centrosymmetric molecule. 266 Another “butterfly” configuration<br />

is exhibited in [Mo4⊲ 3-OCH2Bu-c⊳⊲ -OCH2Bu-c⊳4⊲OCH2Bu-c⊳7⊲c-BuCH2OH⊳]. One

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