A novel tridentate co-ordination mode for the carbonatonickel system
Abstract
The trinuclear compound
[Ni
2
(µ-CO
3
)(dmpd)
4
(H
2
O)][Ni(dmpd)
2
(H
2
O)
2
][ClO
4
]
4
·H
2
O was obtained from the reaction of
basic solutions of nickel(II) perchlorate and
2,2-dimethylpropane-1,3-diamine (dmpd) with atmospheric CO
2.
It
crystallises in the orthorhombic system, space group Pcab, with
a = 18.634(10),
b = 25.447(8), c = 25.598(4)
Å, Z = 8, R = 0.0437.
The three nickel atoms show octahedral co-ordination with three different
environments,
Ni(CO
3
-O,O′)(dmpd)
2
,
Ni(CO
3
-O″)(dmpd)
2
(H
2
O) and
Ni(dmpd)
2
(H
2
O)
2
. The carbonate anion acts
as a bridge between two nickel ions whereas the
[Ni(dmpd)
2
(H
2
O)
2
]
2+
subunit is
linked by hydrogen bonds to the dinuclear group. The dinuclear
[Ni
2
(µ-CO
3
)(dmpd)
4
(H
2
O)]
2+
subunit shows a moderately weak antiferromagnetic coupling
with a J value of -7.8 cm
-1
. The tridentate
co-ordination mode found in the carbonate ligand has not previously been
reported for nickel. Its magnetic behaviour is discussed.
Please wait while we load your content...
