Carbon-13 nuclear magnetic resonance of transition-metal carbonyl clusters through intermolecular cross-polarisation transfer in the solid state
Abstract
The
13
C cross polarisation magic angle spinning NMR
spectra of [Ni
6
(CO)
12
]
2-
at
natural
13
C abundance have been recorded with four different
cations, [NMe
4
]
+
, [NEt
4
]
+
,
[AsPh
4
]
+
and
[N(PPh
3
)
2
]
+
and the crystal structure
of the previously unreported [AsPh
4
]
+
salt of
[Ni
6
(CO)
12
]
2-
has been
determined. Carbonyl resonances of the anion at natural
13
CO
abundance with excellent signal-to-noise ratio (ca. 1∶1
for a single scan) are only observed for
[NMe
4
]
2
[Ni
6
(CO)
12
] and the
possible reasons for this are discussed.
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