Chemical Preparation, Spectroscopic Study and Crystal Structure of DL 2-Ammoniumbutyric Dihydrogenmonophosphate ({\\rm CH_3CH_2CHCOOH)(H_2PO_4)^{\\hbox{\\bf --}}}\\vspace*{-2pt}\\break\\hspace*{-26pt}|\\hspace*{26pt}\\break\\hspace*{-24pt}{^{\\bm +}}{\\rm NH_3}\\hspace*{24pt}}

Abstract

Crystals of DL 2-ammoniumbutyric dihydrogenmonophosphate were obtained by evaporating an aqueous solution containing equimolar quantities of DL 2-amino butyric and orthophosphoric acids. IR and NMR spectrometry studies has been investigated and confirmed by X-ray single crystal diffraction results. The title compound is monoclinic, space group P2 1 /c, unit cell dimensions a = 10.5450(3) Å, b = 10.0486(3) Å, c = 8.9526(4) Å, g = 111.769(5);. Using 1,303 reflections with I > 3 (I) measured on CAD4 Mach 3 diffractometer, the crystal structure was solved by direct methods and was refined by least squares full matrix procedures to R = 0.038. The main feature of this structure consists of an alternate stacking of H 2 PO 4 m tetrahedral sheets and NH 3 C 3 H 6 COOH + cation layers. The H 2 PO 4 m groups are associated to form infinite chains [(H 2 PO 4 )n] n m . The crystal structure is stabilized by a three-dimensional network of strong hydrogen bonds.