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  • Title: Polymorphism in 2-(4-hydroxy-2,6-dimethylanilino)-5,6-dihydro-4H-1,3-thiazin-3-ium chloride.
    Author: Gutierrez J, Eisenberg R, Herrensmith G, Tobin T, Li T, Long S.
    Journal: Acta Crystallogr C; 2010 Dec; 66(Pt 12):o593-5. PubMed ID: 21123891.
    Abstract:
    Details of the structures of two conformational polymorphs of the title compound, C(12)H(17)N(2)OS(+)·Cl(-), are reported. In form (I) (space group P-1), the two N-H groups of the cation are in a trans conformation, while in form (II) (space group P2(1)/c), they are in a cis arrangement. This results in different packing and hydrogen-bond arrangements in the two forms, both of which have extended chains lying along the a direction. In form (I), these chains are composed of centrosymmetric R(4)(2)(18) (N-H...Cl and O-H...Cl) hydrogen-bonded rings and R(2)(2)(18) (N-H...O) hydrogen-bonded rings. In form (II), the chains are formed by centrosymmetric R(4)(2)(18) (N-H...Cl and O-H...Cl) hydrogen-bonded rings and by R(4)(2)(12) (N-H...Cl) hydrogen-bonded rings.
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