Received 1 April 2013
aDepartment of Organic Chemistry, University of Madras, Maraimalai Campus, Chennai 600 025, India,bDepartment of Chemistry, Pondicherry University, Puducherry 605 014, India,cDepartment of Physics, Sri Balaji Chokkalingam Engineering College, Arni, Thiruvannamalai 632 317, India, and dDepartment of Physics, Thanthai Periyar Government Institute of Technology, Vellore 632 002, India
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In the title compound, C18H17NO3S, the thiazepine ring adopts a slightly distorted twist-boat conformation. The dihedral angle between the mean plane of the benzothiazepin ring system and the benzene ring is 60.3 (1)°. In the crystal, molecules are linked by two pairs of inversion-related N-HO and C-HO hydrogen bonds, generating alternating R22(8) and R22(6) ring motifs, respectively, in a zigzag supramolecular chain that runs along the c axis. These chains stack along the a axis via SC [3.424 (2) Å] contacts. A three-dimensional supramolecular network is consolidated by C-H and - interactions [inter-centroid distance between dimethoxybenzene rings = 3.815 (1) Å]. The crystal studied was a non-merohedral twin, with a refined value of the minor twin fraction of 0.2477 (6) .
Data collection: APEX2 (Bruker, 2004); cell refinement: APEX2 and SAINT (Bruker, 2004); data reduction: SAINT and XPREP (Bruker, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: SHELXL97 and PLATON (Spek, 2009).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: TK5214 ).
The authors thank Dr Babu Vargheese, SAIF, IIT, Madras, India, for his help with the data collection.
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