Journal of Coordination Chemistry,
Journal Year:
2024,
Volume and Issue:
77(17-19), P. 2159 - 2174
Published: Oct. 1, 2024
Four
new
copper(II)
compounds
with
an
inorganic,
adamantane-like
core
have
been
prepared
and
structurally
characterized:
[(2-aminopyridine)4(μ2-Br)6Cu4(μ4-O)].(2-aminopyridinium)
bromide
monohydrate
(1),
the
open
cage
structure
(2-aminopyridinium)
[(2-aminopyridine)4(μ2-Cl)5(Cl)2Cu4(μ4-O)]
(2),
bis(2-amino-5-methylpyridinium)
[(2-amino-5-methylpyridine)2(μ2-Cl)6(Cl)2Cu4(μ4-O)]
(3)
co-crystal
[(2-amino-5-fluoropyridine)4(μ-Cl)6Cu4(μ4-O)]2
[(2-amino-5-fluoropyridine)4Cu2Cl4]
(4).
All
four
include
additional
components
in
lattice
ranging
from
a
non-coordinated
ancillary
ligand
(1)
to
co-crystallization
distinct
coordination
complex
The
crystallize
as:
1,
triclinic,
P-1;
2,
monoclinic,
P21/c;
3,
4,
P-1.
Analysis
of
geometric
parameters
within
adamantoid
cores
indicates
significant
structural
resilience
as
are
little
changed
by
presence
lattice.
Breaking
central
chloride
ion
2
significantly
affects
geometry
about
those
two
Cu(II)
ions
but
has
effect
on
other
parts
core.
The Chemical Record,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 16, 2025
Abstract
Direct
methane
to
methanol
conversion
is
a
dream
reaction
in
industrial
chemistry,
which
takes
inspiration
from
the
biological
production
catalysed
by
monooxygenase
enzymes
(MMOs).
Over
years,
extensive
studies
have
been
conducted
on
this
topic
bioengineering
MMOs,
and
tailoring
methods
isolate
MMOs
active
form.
Similarly,
remarkable
achievements
noted
other
activation
strategies
such
as
use
of
heterogeneous
catalysts
or
molecular
catalysts.
In
review,
we
outline
metabolism
performed
methanotrophs
detail
latest
advancements
site
structures
catalytic
mechanisms
both
types
MMOs.
Also,
recent
progress
bioinspired
approaches
using
various
catalysts,
especially
first‐row
transition
metal
zeolites
mechanistic
insights
are
discussed.
addition,
complexes
“Periana
catalyst”
for
through
methyl
ester
formation
presence
strong
acids
also
detailed.
Compared
zeolites‐mediated
field,
utilisation
application
still
its
nascent
phase
further
research
required
overcome
limitations
these
effectively.
ACS ES&T Engineering,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 2, 2025
Methane,
a
potent
greenhouse
gas
(GHG),
has
exhibited
persistent
escalation
in
emissions
from
the
energy
sector.
The
imperative
to
mitigate
these
become
paramount,
and
one
promising
avenue
is
catalytic
conversion
of
methane
into
diverse
chemicals.
This
review
focuses
on
exploration
valuable
compounds,
including
syngas,
olefins,
methanol.
As
advancements
catalysis
technology
studies
have
unfolded,
numerous
additional
insights
novel
significant
compounds
surfaced.
provides
an
in-depth
analysis,
focusing
predominantly
latest
cutting-edge
innovations
methodologies
encompassing
acetonitrile
hydrogen
cyanide
conversion,
selective
formaldehyde,
pyrolysis
solid
carbon
hydrogen,
application
plasma-aided
technology.
Additionally,
it
endeavors
elucidate
critical
parameters
advantages
addresses
intricate
array
limitations
future
prospects
such
as
theoretical
calculations
artificial
intelligence
(AI)-aided
catalyst
design.
Advanced Science,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 14, 2025
Abstract
The
evolution
of
active
sites
in
Cu‐zeolites
for
the
CH
4
‐to‐CH
3
OH
conversion
has
been
investigated
during
oxidative
treatment
O
2
.
Three
samples
with
different
frameworks
but
comparable
Cu
loadings
and
Si/Al
ratios
have
prepared
to
assess
influence
topology
on
material
oxidizability
nature
generated
Cu(II)
species.
Complementary
spectroscopic
studies
highlight
that
isomeric
centers
hosted
within
topologies
are
characterized
by
distinct
formation
rates.
In
turn,
framework‐specific
kinetics
site
generation
regulate
overall
oxidation
potential
individual
zeolites.
Apart
from
topology,
rate
species
is
governed
their
specific
structure,
dimeric
([Cu
(µ‐O)]
2+
)
being
faster
than
monomeric
([CuOH]
+
,
ones.
Elevated
temperatures
accelerate
monomers
cause
[Cu
undergo
autoreduction.
reversibility
this
process
framework‐dependent.
Consequently,
even
though
two
types
form
at
low
each
material,
only
ones
remain
after
high‐temperature
treatment.
autoreduction
accompanied
its
transient
reduction
hydrocarbon
residues,
originating
preceding
decomposition
these
impurities
yields
H
O,
which
adsorbs
masks
fingerprints,
renders
them
inactive.
ChemCatChem,
Journal Year:
2024,
Volume and Issue:
16(21)
Published: July 3, 2024
Abstract
Methane
is
a
potent
greenhouse
gas,
and
reducing
methane
released
to
the
atmosphere
crucial
in
limiting
global
warming.
A
promising
strategy
convert
higher
valuable
chemicals
right
after
emission.
One
class
of
materials
active
for
this
chemistry
are
metal
exchanged
zeolites.
In
concept
paper,
we
describe
how
it
possible
rationalize
performance
zeolites
selective
conversion
methanol.
We
explore
phase
diagrams
can
be
used
identify
condition
dependent
site
structures,
synthesis
stir
distribution,
single
sites
calculated.
Combining
these
three
aspects
then
allows
understand
predict
experimentally
measured
quantities
such
as
spectroscopic
signals.
end,
outline
most
strategies
bring
technology
industrial
feasibility.
Angewandte Chemie,
Journal Year:
2024,
Volume and Issue:
136(45)
Published: July 26, 2024
Abstract
The
CH
4
oxidation
performance
of
Cu‐chabazite
zeolites
characterized
by
distinct
Si/Al
ratios
and
Cu
loadings
has
been
studied
the
observed
variations
in
reactivity
have
correlated
to
differences
nature
formed
active
centers.
Plug
flow
reactor
tests,
situ
Fourier‐transform
infrared,
X‐ray
absorption
spectroscopy
demonstrate
that
a
decrease
loading
shifts
reactivity/redox
profile
higher
temperatures
increases
3
OH
selectivity
Cu‐efficiency.
In
electron
paramagnetic
resonance,
Raman,
ultraviolet‐visible,
photoluminescence
spectroscopies
reveal
this
behavior
is
associated
with
presence
monomeric
sites,
including
bare
2+
[CuOH]
+
present
at
low
ratio
loading.
Formation
two
[Cu
2
(μ‐O)]
moieties
or
forces
these
trends
into
opposite
direction.
Operando
resonance
ultraviolet‐visible
show
apparent
activation
energy
species
decreases
increasing
ratio,
whereas
one
dimeric
centers
unaffected.
