Crystallographic investigations of 1,4-benzothiazin-2(1H)one and 3-methyl-1,4-benzothiazin-2(1H)one

The crystal structures of 1,4-benzothiazin-2(1H)one (C8H 7SNO) (I) and 3-methyl-1,4-benzothiazin-2(1H)one (C9H 9SNO) (II) have been determined by X-ray diffraction methods. I crystallizes in the monoclinic system with space group P21/n, while II crystallizes in triclinic with space group P1̄. The molecular features in both the structures are almost similar; however, there exists an intermolecular interaction in (II) that could be due to the methyl group. © 2004 MAIK "Nauka/Interperiodica".