Crystal and molecular structure of o-methacryloylaminophenylarsonic acid |
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Authors: | M Judith Percino Víctor M Chapela Teresa Zayas Cecilia Rodríguez de Barbarín |
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Institution: | (1) Centro de Química, Instituto de Ciencias, Universidad Autónoma de Puebla, Avenue 14 sur 6303, C.P., 72570 Puebla, Puebla, México;(2) División de Estudios Superiores, Facultad de Ciencias Químicas, U.A.N.L., Guerrero y Progreso S/N, Col. Treviñno, 64570 Monterrey, N.L., México |
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Abstract: | The title compound, o-methacryloylaminophenylarsonic acid (o-MAPHA), C10H12AsNO4, is a monomer used to obtain water-soluble polyelectrolytes. It was obtained from the condensation reaction of o-arsanilic acid and methacryloyl chloride. Crystallization from aqueous ethanol solution yielded colorless prismatic crystals, and one was used for X-ray analysis. The crystal structure was solved using direct methods with a refined R
1 = 0.0483. The crystal structure belongs to the triclinic system, space group
, and the asymmetric unit comprises two molecules of the o-MAPHA acid and one water molecule. Both acid molecules are approximately planar and in both molecules the As atom presents common tetrahedral geometry with two long As–O bonds for hydroxyl groups and one short As–O bond for the oxo groups. The structure of o-arsanilic acid (o-ARSA), C6H8AsNO3, was also determinated using the same methods and compared with the o-arsanilic acid structure previously reported. The crystal structure of the o-arsanilic acid belongs to the monoclinic crystal system and to the P21 noncentrosymmetric space group with Z equals two. |
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Keywords: | arsanilic acids arsonic acids X-ray structure chelating monomer flocculants |
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