Chemistry Reference
In-Depth Information
Fig. 28 Illustration of the
united cluster model
. The
right hand side
illustrates the molecular
orbitals of two well-separated spherical clusters and the
left hand side
the united cluster which
results from progressively squeezing the clusters together. For icosahedral clusters the interstitial
metal atoms diminish from approximately 5.5
for a pair of icosahedra sharing a vertex to 2.64
Å
Å
in [Au
17
Ag
2
(PR3)
10
(NO
3
)
9
], 2.55
Å
in [Pt
19
(CO)
17
]
8
and 2.58
Å
in [Au
14
(PPh
3
)
10
(NO
3
)
4
]
