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A novel La III -based metal–organic framework (MOF) with a new topology: poly[diaquabis(μ 5 -2,5-dioxopiperazine-1,4-diacetato)(μ 2 -oxalato)dilanthanum(III)]
In the title metal–organic framework (MOF), [La(C
8
H
8
N
2
O
6
)(C
2
O
4
)
0.5
(H
2
O)]
n
, the La
III
cation is coordinated by eight O atoms in a square antiprismatic configuration. Each La
III
cation is connected to adjacent La
III
cations by bridging 2,5-dioxopiperazine-1,4-diacetate (PODC
2−
) and oxalate (lying about an inversion centre) ligands, generating two-dimensional grid layers. The layers are further linked
via
the carboxylate groups of the PODC
2−
ligands in
syn
–
syn
and
syn
–
anti
modes, resulting in a three-dimensional framework with a short Schläfli vertex notation of {4
7
.6
3
}{4
7
.6
7
.8}.