Nouveauté : Toutes les publications par laboratoires de l’UFR de chimie  regroupées
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Christine Lepetit, Boris Vabre, Yves Canac, Mohammad Esmaïl Alikhani, Davit Zargarian

Pentacoordinated, square pyramidal cationic PCP Ni(II) pincer complexes: ELF and QTAIM topological analyses of nickel-triflate interactions

Abstract: A previous report introduced a new series of cationic nickel(II) complexes ligated by PCP-type pincer ligands featuring a charge-bearing imidazoliophosphine binding moiety and described their catalytic reactivities in hydroamination of nitriles into amidines...

Exporter la référence : DOI: 10.1007/s00214-018-2332-y (2018)
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P. Soulard, M. Goubet, B. Tremblay

First vibrational investigations of N2O–H2O,...

Abstract: We present for the first time the investigation of water molecules complexed with dinitrogen monoxide, two abundant molecules in atmosphere, in solid neon using Fourier transform infrared (IR) spectroscopy...

Exporter la référence : DOI: 10.1063/1.5055298 (2018)
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Ludovic Bellot-Gurlet, Philippe Dillmann

L’archéométrie une discipline du passé ou un enjeu interdisciplinaire pour l’avenir ?

À l’occasion du colloque du GMPCA organisé à Rennes en 2017 (quarantième anniversaire de la première édition) ont eu lieu une série de conférences invitées destinées à ouvrir une réflexion historiographique sur l’archéométrie. Cet article présente cette initiative et introduit les contributions issues de ces conférences qui sont rassemblées dans ce numéro de la revue ArcheoSciences – Revue d’archéométrie. Au-delà, nous exprimons quelques points de vue sur la pratique et la structuration actuelle et future de l’archéométrie en France. Plus largement nous questionnons la place et la nature de l’interdisciplinarité dans les différents volets des archéosciences.

Exporter la référence : DOI: 10.4000/archeosciences.5347
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J.M. Flaud, A. Anantharaja, F.K. Tchana, L. Manceron and al.

High-resolution analysis of the 12.6 mu m spectral region of the nitryl chloride ClNO2 molecule

Abstract: The 12.6 µm region of nitryl chloride (ClNO2) has been recorded at high resolution (0.00102 cm⁻¹) using a Fourier transform spectrometer and the SOLEIL synchrotron light source...

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J. Qu, N. Goubet, C. Livache, B. Martinez, D. Amelot and al.

Intraband Mid-Infrared Transitions in Ag 2 Se Nanocrystals...

Abstract: Infrared photodetection based on colloidal nanoparticles is a promising path toward low cost devices. However, mid-infrared absorption relies on interband transition in heavy metal based materials, which is a major flaw for the development toward mass market. In the quest of infrared active colloidal materials, we here investigate Ag2Se nanoparticles presenting intraband transition between 3 and 15 µm.

Exporter la référence : DOI : 10.1021/acs.jpcc.8b05699 (2018)
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M.C. Caggiani, P. Colomban

Raman microspectroscopy for Cultural Heritage studies

The Raman effect is at the basis of Raman scattering and microspectrometry: in the first part of the chapter, it is very shortly exposed together with differences with infrared (IR) spectroscopy, and advantages and drawbacks of the technique. The importance of the choice of the excitation wavelength, of the spectrometer (fixed, portable and handheld) and of the optics is underlined, while the information provided by the technique for inorganic and organic materials is considered. The surface-enhanced Raman spectroscopy (SERS) theory and principle applications are also taken into account. In the second part of the chapter, all the different applications of Raman and SERS to cultural heritage materials are contemplated: minerals, gemstones, rocks, patinas and corrosion products, glass, pottery, mortars, dyes, binders, resins, paper, parchment, inks and human remains. For each category of objects, the answers that Raman microspectrometry and SERS can give to the archaeometric and conservation-related questions, the in situ investigations, the search of specific spectral parameters and the use of chemometrics are shown, together with the most recent advances in the field.

Exporter la référence : DOI: 10.1515/psr-2018-0007
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D. Dhib, C. Ayari, E. Raddaoui, P. Soulard

Pressure Broadening Coefficients in the ν 6 Band of CH 3 F in Collision with He...

Abstract: In this study we report the first measurements of the pressure line broadening coefficients of 219 lines of CH3F in the PP, RP, RQ, PQ, and RR sub-branches of the ν6 band (8.5 µm-spectral region) at room temperature using a high-resolution Fourier transform spectrometer...

Exporter la référence : DOI: 10.1016/j.jms.2018.07.009
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P. Colomban, M. Maggetti, A. d'Albis

Non-invasive Raman identification of crystalline and glassy phases in a 1781 Sèvres Royal Factory soft paste porcelain plate

A Raman study of a Sèvres soft paste (frit) porcelain plate allowed the identification of both the crystalline and amorphous phases. Cristobalite and pseudowollastonite gave main Raman signatures in the body where also tridymite, amorphous alkali silicate glass and lead arsenate apatite were detected. Na0.4K0.1Ca0.5Pb4(AsO4)3 lacunar apatite is identified as opacifier in blue and green overglaze enamel. Pb-Sb-reach pyrochlore (Naples Yellow) pigment was found in yellow and green overglaze enamels. The orange hue is obtained by superposing a hematite bearing red paint stroke over the yellow. These results are compared to those previously obtained by detailed OM, SEM, XRD and XRF analyses. Some of the phases identified by XRD (quartz, tridymite) are hardly detected by Raman and vice versa cristobalite was not found by XRD, most probably due to its low amount.

Exporter la référence : DOI: 10.1016/j.jeurceramsoc.2018.07.001
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I. Fikri, M. El Amraoui, M. Haddad, A.S. Ettahiri, L. Bellot-Gurlet and al...

XRF and UV-Vis-NIR analyses of medieval wall paintings of al-Qarawiyyin Mosque (Morocco)

Abstract : Medieval wall painting fragments, taken at the medieval Mosque of al-Qarawiyyin in Fez, have been investigated by means of X-ray fluorescence and UV-Vis-NIR diffuse reflectance spectroscopies. The analyses permitted to determine the palette of pigments used by craftsmen of the time...

Exporter la référence : DOI:10.1088/1757-899X/353/1/012020
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Patrick Schmidt , Ludovic Bellot-Gurlet, Harald Floss

The unique Solutrean laurel-leaf points of Volgu: Heat-treated or not?

The laurel-leaf points of the Volgu cache found in eastern France rank among the most remarkable examples of skilled craftsmanship known from the Solutrean period of the Upper Palaeolithic. In addition to pressure flaking, heat treatment may have helped in the making of the points, as both have been previously described in association with Solutrean assemblages. This study presents the results of an infrared spectroscopic analysis of seven artefacts from the Volgu cache conducted to test this assumption. The findings show that heat treatment was not universally applied to this particular tool type, meaning that we must rethink the reasons why such a technique was used.

Exporter la référence : DOI: 10.15184/aqy.2018.87
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