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ChemInform Abstract: A New Polymorph of Ba(AsO3OH): Synthesis, Crystal Structure and Vibrational Spectra.

✍ Scribed by Tamara Dordevic; Ljiljana Karanovic

Publisher
John Wiley and Sons
Year
2011
Weight
21 KB
Volume
42
Category
Article
ISSN
0931-7597

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✦ Synopsis

A New Polymorph of Ba(AsO 3 OH): Synthesis, Crystal Structure and Vibrational Spectra. -Colorless, needle-like crystals of the new monoclinic Ba(AsO3OH) polymorph are hydrothermally synthesized from a mixture of Ba(OH)2, Zn powder, and As2O5 in H2O (autoclave, 220 Β°C, 36 h, about 30% yield) along with transparent, colorless, prismatic crystals of orthorhombic Ba(AsO3OH) (30% yield). The new polymorph crystallizes in the monoclinic space group P2 1 with Z = 12 and exhibits a layered structure built up of four types of regularly alternating layers. Every AsO3OH tetrahedron is chelating to two Ba atoms and bridged by another two Ba atoms. Each OH group acts as hydrogen bond donator toward the oxygen atoms positioned in the same or adjacent layers. -(DORDEVIC*, T.;

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