Crystals,
Journal Year:
2024,
Volume and Issue:
14(12), P. 1026 - 1026
Published: Nov. 27, 2024
Two
new
Tb(III)
metal–organic
frameworks
based
on
4,7-dimethylphenanthroline
(dmphen)
and
flexible
ligand
trans-1,4-cyclohexanedicarboxylate
(chdc2−)
were
synthesized
characterized.
Their
crystallographic
formulae
are
[Tb2(dmphen)2(H2O)2(chdc)3]·2DMF
(1;
DMF
=
N,N-dimethylformamide)
[Tb2(dmphen)2(NO3)2(chdc)2]·2DMF
(2).
Among
some
differences
in
their
synthetic
conditions,
the
most
important
one
is
apparently
using
of
terbium(III)
nitrate
instead
chloride
as
a
metal
precursor
synthesis
2,
providing
coordination
to
Tb3+,
its
subsequent
notable
structural
1.
Compound
1
was
found
have
layered
hcb
structure
with
intralayer
windows
ca.
10
×
8
Å2
size.
Its
layer-to-layer
packing
leaves
narrow
channels
running
across
these
windows,
18%
total
solvent-accessible
volume
structure.
2
sql
smaller
6
Methyl
substituents
phen
ligands
do
not
affect
topology
framework
but
seem
substantial
effect
density,
well
pore
resulting
MOF.
A
high
18.4%
luminescence
quantum
yield
for
2.
emission
lifetime
0.695(12)
ms
belongs
typical
range
phosphorescent
Tb(III)-carboxylate
complexes.
quenching
by
different
nitroaromatic
molecules
found.
linear
concentration
dependence
3-nitrotoluene
4-nitro-m-xylene
at
micromolar
concentrations
during
luminescent
titration
experiments
(LOD
values
350
nM),
suggesting
this
MOF
be
viable
highly
sensitive
sensor
such
substrates.
Phenylglyoxylic
acid
(PGA),
the
metabolite
of
styrene
after
its
invasion
into
human
body,
must
be
monitored
conveniently
and
accurately.
Herein,
two
zinc-based
metal–organic
frameworks
{[Zn(H2L)bimb]}n
(Zn-1)
{[Zn2(H2L)2bipd]}n
(Zn-2)
[H4L
=
1,2,4,5-tetrakis(4-carboxyphenyl)-3,6-dimethyl-benzene,
bimb
1,1-(1,4-butanediyl)bis(imidazole),
bipd
3,5-bis(1-imidazole)pyridine]
had
been
obtained
by
solvothermal
method
could
used
for
selective
detection
PGA
with
an
extremely
low
limit.
Single-crystal
X-ray
diffraction
analyses
revealed
that
Zn-1
exhibits
a
2D
topological
framework
point
symbol
(66),
whereas
Zn-2
shows
(324.436.56)
topology.
Fluorescence
proved
obvious
quenching
effects
on
PGA,
body.
Impressively,
not
only
gave
short
response
times
(less
than
5
s)
but
also
exhibited
relatively
limit
detections
in
water
simulated
urine
(1.44,
0.50
1.63,
1.14
μM,
respectively).
Meanwhile,
high
stability,
excellent
anti-interference
ability,
recyclability,
making
them
promising
sensors
practical
PGA.
Moreover,
density
functional
theory
calculation
showed
photoinduced
electron
transfer
mechanism,
resulting
fluorescence
quenching;
meanwhile,
photocompetitive
absorption
processes
ligands
can
affect
emission
Zn-2.
Advanced Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 24, 2025
The
application
of
in
situ
and
operando
spectroscopic
techniques
has
significantly
advanced
the
understanding
reticular
materials,
particularly
metal-organic
frameworks
(MOFs)
covalent
organic
(COFs).
These
offer
real-time
insights
into
dynamic
structural,
electronic,
chemical
changes
that
occur
within
these
materials
during
various
processes,
such
as
catalysis,
sorption,
material
synthesis.
This
review
offers
a
comprehensive
overview
key
used
to
investigate
formation,
functionalization,
catalytic
behavior
materials.
How
have
elucidated
roles
active
sites,
reaction
intermediates,
structural
transformations
under
conditions,
especially
single-site
electrocatalysis,
photocatalysis,
is
highlighted.
also
discusses
challenges
opportunities
lie
ahead
integrating
methods
with
aiming
foster
further
innovation
design
versatile
Dalton Transactions,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
New
1,4-naphthalenedicarboxylic
acid-
and
3,5-bis(benzimidazol-2-yl)pyridine-appended
Cd(
ii
)
Zn(
coordination
polymers
were
synthesized
used
as
recoverable
turn-off
luminescent
sensors
for
tetracycline.
