Received 23 June 2011
aDepartment of Chemistry, Keene State College, 229 Main Street, Keene, NH 03435-2001, USA,bDepartment of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore 570 006, India, and cDepartment of Chemistry, Sambhram Institute of Technology, Bangalore 560 097, India
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In the title compound, C19H20F3NOS, the dihedral angle between the mean planes of the two benzene rings attached to the thioxanthene ring is 41.8 (7)°; the latter has a slightly distorted boat conformation. The F atoms are disordered over three sets of sites [occupancy ratio = 0.564 (10):0.287 (10):0.148 (5)] and the methyl groups are disordered over two sets of sites [occupancy ratio = 0.72 (4):0.28 (4)]. The crystal packing is stabilized by O-HN and C-HS hydrogen bonds and weak C-HCg interactions.
For photo-initiators with excellent capabilities in UV-curing materials, see: Fouassier et al. (1995); Roffey (1997). For related structures, see: Post et al. (1975a,b); Liu, (2009). For puckering parameters, see: Cremer & Pople (1975).
Data collection: CrysAlis PRO (Oxford Diffraction, 2010); cell refinement: CrysAlis PRO; data reduction: CrysAlis RED (Oxford Diffraction, 2010); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: TK2761 ).
MSS thanks the University of Mysore and R. L. Fine Chem, Bangalore, for access to their research facilities. JPJ acknowledges the NSF-MRI program (grant No. CHE1039027) for funds to purchase the X-ray diffractometer.
Cremer, D. & Pople, J. A. (1975). J. Am. Chem. Soc. 97, 1354-1358.
Fouassier, J. P., Ruhlmann, D., Graff, D., Morlet-Savary, F. & Wieder, F. (1995). Prog. Org. Coat. 25, 235-271.
Liu, G. (2009). Acta Cryst. E65, o613.
Oxford Diffraction (2010). CrysAlis PRO and CrysAlis RED. Oxford Diffraction Ltd, Yarnton, England.
Post, M. L., Kennard, O. & Horn, A. S. (1975a). Acta Cryst. B31, 2724-2726.
Post, M. L., Kennard, O., Sheldrick, G. M. & Horn, A. S. (1975b). Acta Cryst. B31, 2366-2368.
Roffey, C. (1997). In Photogeneration of Reactive Species for UV-Curing. Sussex, England: Wiley.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.