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2 Homometallic Alkoxides

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244<br />

Table 4.3 <strong>Alkoxides</strong> of aluminium, gallium, indium, and thallium<br />

M–O Bond lengths ( ˚A)<br />

Metal Bond angles ( Ž )<br />

Compound coordination Terminal Bridging � MOC Reference<br />

[Al4⊲ -OPr i ⊳6⊲OPr i ⊳6] 4 and 6 av. 1.71 (2) 1.94 (1) (oct) 146 (t, av.) 53<br />

1.80 (2) (tet) 129 (b, av.)<br />

[Al4⊲ -OPr i ⊳6⊲OPr i ⊳6] 4 and 6 av. 1.700 (5) 1.925 (5) (oct) 140 (t, av.) 55<br />

1.802 (5) (tet) 129 (b, av.)<br />

[Al3Cl5⊲ -OPr i ⊳4] 4 and 5 – 1.917, 1.804 (7) (tbp)<br />

1.801, 1.756 (5) (tet)<br />

128 (b) 56<br />

[⊲C6H11NH3⊳CfAl⊲OPr i ⊳4g ]<br />

[Al2⊲ -OBu<br />

4 av. 1.74 (1) – av. 126 58<br />

t ⊳2⊲OBu t ⊳4] 4 1.698–1.681 (3)<br />

av. 1.688<br />

1.831–1.824 (3)<br />

av. 1.828<br />

144 (t, av.)<br />

130 (b, av.)<br />

59<br />

[Al2⊲ -NMe2⊳⊲ -OBu t ⊳⊲OBu t ⊳4] 4 1.671–1.697 (4) 1.819 and 1.823 (3) – 60<br />

av. 1.683 av. 1.821<br />

[Al⊲OBu t ⊳3⊲Me2NH⊳] 4 1.699–1.744 (2)<br />

av. 1.718<br />

– – 60<br />

[Al2⊲ -l-mentholate⊳2Me4] 4 – 1.835–1.847 (3)<br />

av. 1.841<br />

– 61<br />

[Al2⊲ -l-mentholate⊳2Bui 4 ] 4 – 1.833–1.852 (9)<br />

av. 1.841<br />

– 61<br />

[Al2⊲ -l-borneolate⊳2Me4] 4 – 1.829–1.861 (5)<br />

av. 1.841<br />

– 61<br />

[Al2⊲ -OBu t ⊳2H4] 4 – 1.810 and 1.815 (3)<br />

av. 1.812<br />

129.6 and 131.4 62<br />

[Al2⊲ -OBu t ⊳2⊲OBu t ⊳2H2] 4 1.675 (3) 1.817 (3) 144.3 (t)<br />

130.1 (b, av.)<br />

62<br />

[⊲ButO2⊳⊲ButO⊳Al⊲ -OBu t ⊳2Al(mesal) 2]<br />

mesal D methylsalicylate<br />

4 and 6 1.69 (1) Not reported Not reported 63<br />

[Al3⊲ -OPr i ⊳4⊲OPr i ⊳2⊲acac⊳3] 4 and 6 1.662, 1.716 (7) av. 1.909 (7) (oct) 140 (t, av.) 64<br />

1.766, 1.794 (6) (tet) 129 (b, av.)

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