SCHEDULED MAINTENANCE
Rhenium and molybdenum oxo-complexes containing ligands related to N-hydroxyiminodipropionic acid
Abstract
The reaction of N-hydroxy-2,2′-iminodipropionic acid
with [PPh
4
][ReOBr
4
],
[ReOCl
3
(PPh
3
)
2
],
[ReOCl
2
(OEt)(PPh
3
)
2
] or
[PPh
4
][MoOCl
4
(H
2
O)] has produced four
novel complexes:
[ReOBr
3
(C
6
H
8
NO
5
)]
-
,
[ReOBr
3
(C
3
H
3
NO
2
)]
-
,
[ReOCl
2
(R,S-idpa)]
-
(H
3
idpa = 2,2′-iminodipropionic acid) and
[MoO
2
Cl
2
(C
3
H
4
NO
3
)]
-
. All have been successfully crystallised as their
[PPh
4
]
+
salts which have been characterised by
single-crystal X-ray diffraction. The anions
[ReOBr
3
(C
6
H
8
NO
5
)]
-
and
[ReOBr
3
(C
3
H
3
NO
2
)]
-
involve tetragonally distorted octahedral
Re
V
OBr
3
(N,O) centres with the
bromides cis to the oxo-group;
[ReOCl
2
(R,S-idpa)]
-
involves a tetragonally distorted octahedral
Re
V
OCl
2
(O,N,O) centre
with the 2Cl cis and O trans to the oxo-group;
[MoO
2
Cl
2
(C
3
H
4
NO
3
)]
-
involves a skew-trapezoidal
Mo
VI
O
2
Cl
2
(N,O)
centre with essentially mutual cis oxo-groups and
trans chloro-groups. The dimensions of each of these
co-ordination spheres are generally typical of related complexes;
however,
[ReOBr
3
(C
3
H
3
NO
2
)]
-
involves an unusually short Re–O
oxo
bond
of 1.45(4) Å. The organic moieties are considered to arise from
rearrangement and/or fragmentation of
N-hydroxy-2,2′-iminodipropionic acid, presumably under
the influence of the metal centre.
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