Multi-technique Structural Analysis of Zinc Carboxylates (soaps)
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A series of medium- and long-chain zinc carboxylates (zinc octanoate, zinc nonanoate, zinc decanoate, zinc undecanoate, zinc dodecanoate, zinc pivalate, zinc stearate, zinc palmitate, zinc oleate, and zinc azelate) was analyzed by ultra-high-field Zn NMR spectroscopy up to 35.2 T, as well as C NMR and FTIR spectroscopy. We also report the single-crystal X-ray diffraction structures of zinc nonanoate, zinc decanoate, and zinc oleate-the first long-chain carboxylate single-crystals to be reported for zinc. The NMR and X-ray diffraction data suggest that the carboxylates exist in three distinct geometric groups, based on structural and spectroscopic parameters. The ssNMR results presented here present a future for dynamic nuclear polarization (DNP)-NMR-based minimally invasive methods for testing artwork for the presence of zinc carboxylates.
Evangelou D, Pournara A, Karagianni V, Dimitriou C, Andreou E, Deligiannakis Y ACS Appl Mater Interfaces. 2024; 16(10):12672-12685.
PMID: 38421719 PMC: 11191008. DOI: 10.1021/acsami.3c19536.