Metal-metal bond
Metal-metal bond
Metal-metal bond
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<strong>Metal</strong>‐<strong>metal</strong> <strong>bond</strong> (M 2L 8)<br />
Electron Count Resulting M-M Bond<br />
d1 -d1 Single <strong>bond</strong><br />
d2 -d2 Double <strong>bond</strong><br />
d3 -d3 Triple <strong>bond</strong><br />
d4 -d4 Quadruple <strong>bond</strong> optimum<br />
d5 -d5 Triple <strong>bond</strong><br />
d6 -d6 Double <strong>bond</strong><br />
d7 -d7 Single <strong>bond</strong><br />
d8 - d8 No <strong>bond</strong> (symmetry interaction)<br />
H 3C CH 3<br />
H 3C<br />
Re<br />
CH 3<br />
H H3CC CH CH3 H 3C<br />
RRe<br />
CH 3<br />
2-<br />
PR3 Cl Re Cl<br />
R3P Re<br />
R 3P Cl<br />
Cl PR 3<br />
Me<br />
L<br />
L<br />
L<br />
L<br />
M<br />
M<br />
L<br />
L<br />
L<br />
L<br />
σ∗<br />
π∗ M-M anti<strong>bond</strong>ing<br />
orbitals<br />
δ∗<br />
dz2 dyz dxy dxy dyz dz2 dxz dxz the dx2- y2, s and px,y<br />
orbitals are not shown<br />
since they are used<br />
for M-ligand <strong>bond</strong>ing<br />
Re-Re = 22.18 18 Å CCr-Cr C =1.85 1 85 Å<br />
Eclipsed conformations<br />
O<br />
δ<br />
π M-M <strong>bond</strong>ing<br />
orbitals<br />
σ<br />
O<br />
Cr Cr<br />
Me<br />
4
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