In this report, metal organic frameworks (MOFs) are designed and tuned for the structural variations in order to induce the metal capture which in turn directs the dye adsorption properties....
In
this work, a series of three copper(II) metal-organic frameworks
(MOFs), [Cu(4,4′-DP)Cl]
n
(
1
), [Cu(4,4′-DP)
0.5
Cl]
n
(
2
), and [Cu(4,4′-TMDP)Cl]
n
(
3
) (4,4′-DP = 4,4′-dipyridyl,
4,4′-TMDP = 4,4′-trimethylenedipyridyl), is designed
and synthesized under solvothermal conditions. Crystallographic investigations
reveal that
1
and
2
have tetrahedral and
3
has octahedral environment around the Cu(II) ion. By varying
the solvent conditions and ligand derivatives, the topology can be
interestingly tuned. TOPOS Pro provides topological conclusions that
1
is stabilized by unusual 2D + 2D → 3D polycatenation
of layers lying in (110) and (11̅0) planes with dihedral angle
of 90° showing altogether
fes
,
hcb
, and
sql
topologies.
On the other hand,
2
exhibits a
bey
(3,4-c net) topology and
3
shows 4-fold interpenetration
with the
dia
topology. The dc measurements
for
1
–
3
performed on polycrystalline
samples in a 0.1 T field confirm strong ferromagnetic behaviors for
1
and
2
and moderate antiferromagnetic behavior
for
3
. To examine the sensing properties of the three
MOFs, various hazardous nitroaromatic compounds (NACs) were used as
analytes. While
1
is a potent fluorescence sensor for
highly sensitive detection of multiple NACs,
2
selectively
detects
meta
-dinitrobenzene (
m
-DNB)
with
K
SV
= 5.73 × 10
5
M
–1
and a remarkably lower limit of detection (LOD) value
of 1.23 × 10
–7
M.
3
does not show
sensing ability toward any NAC probably due to the coordination environment
being different from those in
1
and
2
. The
work demonstrates fine-tuning of the topology and in turn magnetic
and sensing properties by changing the reaction conditions.
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