Abstract
The X-ray crystal structure of 3-ammonium-4-hydroxyphenylarsonic acid chloride dihydrate has been determined from single-crystal diffraction data. The compound crystallizes in the orthorhombic space groupPna 21 with four molecules in a unit cell of dimensionsa=17.712(7),b=13.468(4), andc=4.798(2) Å. The structure was solved by the Patterson method and refined to a finalR value of 2.1%. The average C-C phenyl distance is 1.393 Å, but two bonds are somewhat shorter than the others. This, coupled with the fact that the C-O and C-As bonds are shorter than normal, makes it appear as if there is a minor resonance contributor of a keto form. The C-N bond length of 1.443 Å is intermediate between values found in aminophenols and other ammoniumphenols. The H2AsO3 group is nearly tetrahedral, with the double-bonded oxygen rotated 9° out of the phenyl plane about the C-As bond. There is an extensive hydrogen-bonding system, involving every one of the OH and NH hydrogens, through the chloride and the waters of crystallization.
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Korp, J.D., Bernal, I., Avens, L. et al. The X-ray crystal structure of 3-ammonium-4-hydroxyphenylarsonic acid chloride dihydrate. Journal of Crystallographic and Spectroscopic Research 13, 263–272 (1983). https://doi.org/10.1007/BF01158906
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DOI: https://doi.org/10.1007/BF01158906