http://www.cnr.it/ontology/cnr/individuo/prodotto/ID48332
X-ray absorption investigations of copper resinate blackening in a XV century Italian painting (Articolo in rivista)
- Type
- Label
- X-ray absorption investigations of copper resinate blackening in a XV century Italian painting (Articolo in rivista) (literal)
- Anno
- 2008-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1007/s00339-008-4498-y (literal)
- Alternative label
Cartechini, L.; Miliani, C.; Brunetti, B. G.; Sgamellotti, A.; Altavilla, C.; Ciliberto, E.; Dacapito, F. (2008)
X-ray absorption investigations of copper resinate blackening in a XV century Italian painting
in Applied physics. A, Materials science & processing (Print)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Cartechini, L.; Miliani, C.; Brunetti, B. G.; Sgamellotti, A.; Altavilla, C.; Ciliberto, E.; Dacapito, F. (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
- DOI: 10.1007/s00339-008-4498-y (literal)
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Istituto di Scienze e Tecnologie Molecolari, CNR, c/o Dipartimento di Chimica, Università di Perugia,
via Elce di Sotto 8, 06123 Perugia, Italy
INSTM and Centro SMAArt, Dipartimento di Chimica, Università di Perugia, via Elce di Sotto 8,
06123 Perugia, Italy
Dipartimento di Scienze Chimiche, Università di Catania, Viale Doria 6, 95125 Catania, Italy
CNR-INFM-OGG, c/o ESRF, GILDA CRG, 6 Rue Jules Horowitz, 38043 Grenoble, France (literal)
- Titolo
- X-ray absorption investigations of copper resinate blackening in a XV century Italian painting (literal)
- Abstract
- Investigations of the darkening phenomenon of copper resinate observed
in a XV century easel painting were carried out by X-ray absorption
spectroscopy (XAS) at the GILDA beamline of the European synchrotron
radiation facility (ESRF, Grenoble, France). X-ray absorption near edge
structure and extended X-ray absorption fine structure (EXAFS)
measurements were collected at the Cu K-edge on an original painting
sample, as well as on fresh pigment standards and on painting models.
The study was aimed at providing structural information of the
oxidation states and the local chemical environment (neighbouring atoms
and bond distances) of copper in the unaltered and blackened pigments
in order to elucidate the discoloration mechanism. Complementary
information on optical and molecular properties of copper resinate were
obtained by UV-vis and Fourier transform infrared spectroscopies. EXAFS
analysis evidenced that the local chemical environment of Cu in copper
resinate can be described using neutral copper acetate as a model. It
consists, essentially, of bimetal Cu2+ carboxylate complexes with a
distorted octahedral coordination. Such a structure is retained in the
blackened pigment, although some differences were observed. It has been
found that the alteration takes place without change of the valence
state of Cu(II) ions, while the formation of the copper oxides CuO and
Cu2O responsible for the embrownment is excluded. On the basis of the
XAS results we deduced that discoloration of copper resinate may be
related to local modification of the copper coordination structure as
evidenced by the observation of an increase of the Cu-Cu and Cu-C
distances in the EXAFS spectra. (literal)
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- Autore CNR
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