Počet záznamů: 1
Long-chain mercury carboxylates relevant to saponification in oil and tempera paintings: XRPD and ssNMR complementary study of their crystal structures
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SYSNO ASEP 0554813 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Long-chain mercury carboxylates relevant to saponification in oil and tempera paintings: XRPD and ssNMR complementary study of their crystal structures Tvůrce(i) Barannikov, Ruslan (UACH-T) RID, SAI
Kočí, Eva (UACH-T) SAI, RID
Bezdička, Petr (UACH-T) SAI, RID, ORCID
Kobera, Libor (UMCH-V) RID, ORCID
Mahun, Andrii (UMCH-V) ORCID
Rohlíček, Jan (FZU-D) RID, ORCID
Plocek, Jiří (UACH-T) RID, ORCID, SAI
Švarcová, Silvie (UACH-T) SAI, RID, ORCIDCelkový počet autorů 8 Zdroj.dok. Dalton Transactions. - : Royal Society of Chemistry - ISSN 1477-9226
Roč. 51, č. 10 (2022), s. 4019-4032Poč.str. 14 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova cross-polarization ; adiabatic pulses ; thermal-behavior ; chemical-shift ; metal soaps ; NMR Vědní obor RIV CA - Anorganická chemie Obor OECD Inorganic and nuclear chemistry Vědní obor RIV – spolupráce Ústav makromolekulární chemie - Makromolekulární chemie
Fyzikální ústav - Fyzika pevných látek a magnetismusCEP LM2018124 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy GA19-05259S GA ČR - Grantová agentura ČR Způsob publikování Omezený přístup Institucionální podpora UACH-T - RVO:61388980 ; UMCH-V - RVO:61389013 ; FZU-D - RVO:68378271 UT WOS 000756793200001 EID SCOPUS 85125965108 DOI 10.1039/d1dt04160f Anotace Saponification, resulting from pigment-binder interactions, is one of the most endangering phenomena affecting the appearance and stability of painted works of art. The crystallization of metal carboxylates (soaps) in paint layers is recently assumed as the most critical point for the development of undesirable changes induced by saponification, however, the factors triggering it are not fully understood. The red pigment cinnabar (HgS) has been suspected of contributing to saponification, however, the paucity of reliable reference structural data limited the experimental research of its effect at the molecular level. Within this study we synthesized mercury(ii) carboxylates of the formula Hg(C16)(x)(C18)(2-x) (x = 0.0, 0.2, 0.5, 0.8, 1.0, 1.2, 1.5, 1.8, 2.0) where C16 and C18 are hexadecanoate (palmitate) and octadecanoate (stearate), respectively, and characterize them by combination of X-ray powder diffraction (XRPD) and C-13 and Hg-199 solid state NMR (ssNMR). For a more detailed interpretation of their structural and thermal behavior, Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC) were used. The crystal structure of the studied mercury carboxylates was described on the basis of complementary ssNMR and XRPD measurements, Rietveld refinement and DFT calculations. All the subjected compounds crystallize in a monoclinic lattice of the C2/c symmetry. Mercury atoms are arranged in a slightly distorted square antiprismatic geometry and are monodentatically bonded to carboxylate anions. The structural disorder at the aliphatic end of the stearic acid chains was detected in the mixed carboxylates. Within the paper, the structural (dis)similarity with the corresponding lead carboxylates is discussed. The synthesized and characterized mercury carboxylates were applied to describe neo-formed mercury soaps in a model experiment simulating an egg-based paint system. Pracoviště Ústav anorganické chemie Kontakt Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Rok sběru 2023 Elektronická adresa https://doi.org/10.1039/D1DT04160F
Počet záznamů: 1