The hydrated and anhydrous gold(III) tetra­chloride salts of l-ecgonine, an important forensic toxicology marker for cocaine

Wood, M.R.; Thompson, H.W.; Brettell, T.A.; Lalancette, R.A.

doi:10.1107/S0108270109030583

Acta Crystallographica Section C
Acta Crystallographica
Section C STRUCTURAL CHEMISTRY

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Figure 1
The asymmetric unit of (I)

, showing the atom-numbering scheme and including nine symmetry-related atoms to show the hydrogen bonding or close contacts. Displacement ellipsoids are drawn at the 40% probability level. All C-bound H atoms have been omitted for clarity. The four monopositive N-protonated L-ecgonine cations are surrounded by five [AuCl₄]⁻ counter-ions plus seven water molecules, one of which (not identified) could exist as a hydronium ion, for charge balance. Heavy dashed lines indicate the intramolecular hydrogen bond in each cation and the locations of the known hydrogen bonds in the structure. Thin solid lines show the intermolecular close contacts. [Symmetry codes: (i) −x + 1, y + $[{1\over 2}]$ , −z + $[{3\over 2}]$ ; (ii) −x + 1, y − $[{1\over 2}]$ , −z + $[{3\over 2}]$ ; (iii) x + 1, y, z; (iv) −x, y + $[{1\over 2}]$ , −z + $[{3\over 2}]$ ; (v) x − 1, y, z; (vi) x − 1, y + 1, z.]

STRUCTURAL
CHEMISTRY

ISSN: 2053-2296

Volume 66| Part 1| December 2010| Pages m4-m8

doi:10.1107/S0108270109030583

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