Vibrational and electronic spectroscopy of the octacyanodimolybdate ion, [Mo2(CN)8]4-
Abstract
The infrared, Raman and resonance-Raman spectra of
[NEt
4
]
4
[Mo
2
(CN)
8
] have been
recorded in solution and the solid state, and the important features of
each assigned. The strong, polarised Raman band at 411
cm
-1
is assigned to ν(MoMo), the highest reported
ν(MoMo) value for a quadruply bonded, unbridged dimolybdenum complex.
Resonance-Raman studies have shown that ν(MoMo) is coupled to a
strong electronic band at 16 580 cm
-1
. The
depolarisation ratio of the band at 411 cm
-1
is
ca. ⅓ at resonance, which indicates that the
resonant transition is axially polarised, consistent with its assignment
to the
(δ*)(δ) ← (δ)
2
transition.
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