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Effect of co-ligands on photoredox pathways in Cr(III) oxalate complexes
pl
dc.type
JournalArticle
pl
dc.description.physical
78-84
pl
dc.abstract.en
The
photochemical
behaviour
of
some
mixed
ligand
chromium(III)
complexes
with
amino
acids, $[Cr(C_{2}0_{4})_{2}(Aa)]_{n-}$
(where
Aa=alanine,
valine,
serine,
cysteine,
asparagine,
aspartic
acid)
was
studied.
The
attention
was
focused
on
the
photoredox
mode,
which
proceeded
via
inner-
or
intramolecular
path-
way
yielding
Cr(II)
species
and
hydrated
electrons,
respectively.
The
secondary
thermal
processes
were
dependent
on
the $O_{2}$
presence
and
solution
pH:
(i)
in
oxygen-free
media
the
regeneration
of
substrate
and
photoaquation
induced
by
the
Cr(III)$\rightarrow$Cr(II)
reduction
were
observed,
(ii)
in
the
presence
of $O_{2}$
both
Cr(II)
and
ligands
were
oxidized
and
the
former
was
transformed
not
only
into
Cr(III)
but
also
to
Cr(VI)
(provided
that
pH>7).
Prolonged
irradiation
resulted
in
photoreduction
of
Cr(VI)
accompanied
by
pho-
todegradation
of
oxalate
and/or
amino-acid
ligands.
The
photoreaction
modes
were
independent
of
the
co-ligand
nature,
but
the
secondary
reaction
rates
and
efficiencies
were
sensitive
both
to
the
co-ligand
nature
and
its
side
substituent.
Environmental
consequences
of
the
chromium
photoreduction
are
dis-
cussed
in
the
paper:
the
parameters
affecting
production
and
consumption
of
Cr(VI)
are
analysed,
and
the
tools
of
controlling
the
photoredox
behaviour
of
the
Cr(III)
and
Cr(VI)
compounds
are
suggested.
pl
dc.subject.en
chromium(III) complexes
pl
dc.subject.en
oxalate
pl
dc.subject.en
chromate(VI)
pl
dc.subject.en
amino acid
pl
dc.subject.en
photoinduced electron transfer
pl
dc.subject.en
photoreduction
pl
dc.description.volume
250
pl
dc.description.points
25
pl
dc.identifier.doi
10.1016/j.jphotochem.2012.09.013
pl
dc.identifier.eissn
1873-2666
pl
dc.title.journal
Journal of Photochemistry and Photobiology. A, Chemistry
pl
dc.language.container
eng
pl
dc.affiliation
Wydział Chemii : Zakład Chemii Nieorganicznej
pl
dc.subtype
Article
pl
dc.rights.original
bez licencji
pl
.pointsMNiSW
[2012 A]: 25
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