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Crystal chemistry and thermal behavior of metal salts and complexes of unsaturated dicarboxylic acids: aquabis(hydrogen itaconato)barium(II), [Ba(C5H5O4)2(OH2)]

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Abstract

[Ba(C5H5O4)2(OH2)] is monoclinic, C2/c, with a = 4.472(1), b = 13.312(3), c = 22.236(5) Å, β= 92.90(1)°, Z = 4, and D m = 2.06 g cm−3. The barium atom is 10-coordinate with Ba—O distances in the range 2.749(2)–2.989(2) Å. The material suffers a complex decomposition process upon heating at temperatures between 25 and 600°C in dynamic nitrogen and static air atmospheres. FT-IR and gas chromatography analyses indicate that water, CO, CO2, methane, ethane, ethylene, propane, propylene, and butane, are evolved during the heating process, leaving a residue of BaCO3. 1H-NMR spectra of a sample heated at 200°C, showed isomerization of barium itaconate to barium methylmaleate.

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Authors and Affiliations

  1. Facultad de Ciencias, Departamento de Química, Universidad de Los Andes, Apdo. Postal 40, La Hechicera, Mérida, 5251, Venezuela

    Alexander V. Briceño, Graciela Díaz de Delgado, Belkis V. Ramírez, William O. Velásquez & Alí B. Bahsas

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  1. Alexander V. Briceño
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  2. Graciela Díaz de Delgado
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  3. Belkis V. Ramírez
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  4. William O. Velásquez
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  5. Alí B. Bahsas
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Briceño, A.V., de Delgado, G.D., Ramírez, B.V. et al. Crystal chemistry and thermal behavior of metal salts and complexes of unsaturated dicarboxylic acids: aquabis(hydrogen itaconato)barium(II), [Ba(C5H5O4)2(OH2)]. Journal of Chemical Crystallography 29, 785–791 (1999). https://doi.org/10.1023/A:1009591619208

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