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The title mol-ecular salt, C 9 H 12 NO 4  + ·Cl - ·C 9 H 11 NO 4 , is isotypic with that of the bromide counterpart [Kathiravan et al. (2016 ▸). Acta Cryst. E 72 , 1544-1548]. The title salt is a second monoclinic polymorph of the l-dopa HCl structure reported earlier in the monoclinic space group P 2 1 [Jandacek &amp; Earle (1971 ▸). Acta Cryst. B 27 , 841-845; Mostad &amp; Rømming (1974 ▸). Acta Chemica Scand. B 28 , 1161-1168]. In the title compound, monoclinic space group I 2, one of the dopa mol-ecules has a positive charge with a protonated α-amino group and the α-carb-oxy-lic acid group uncharged, while the second dopa mol-ecule has a neutral charge, the α-amino group is protonated and the α-carb-oxy-lic acid is deprotonated. In the previously reported form, a single dopa mol-ecule is observed in which the α-amino group is protonated and the α-carb-oxy-lic acid group is uncharged. The invariant and variations of various types of inter-molecular inter-actions present in these two forms of dopa HCl structures are discussed with the aid of two-dimensional fingerprint plots.

acta crystallographica. section e, crystallographic communications

Crystal structure and Hirshfeld surface analysis of 1-carboxy-2-(3,4-dihydroxyphenyl)ethan-1-aminium chloride 2-ammonio-3-(3,4-dihydroxyphenyl)propanoate: a new polymorph of<scp>L</scp>-dopa HCl and isotypic with its bromide counterpart

Crystal structure and Hirshfeld surface analysis of 1-carboxy-2-(3,4-dihydroxyphenyl)ethan-1-aminium chloride 2-ammonio-3-(3,4-dihydroxyphenyl)propanoate: a new polymorph ofL-dopa HCl and isotypic with its bromide counterpart