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X-Ray Powder Data for Two Tetracyclines: 6-Methylene-5-Hydroxytetracycline Hydrochloride (Methacycline Hydrochloride), C22H23N2O8Cl, and 6-Demethyl-7-Chlorotetracycline Hydrochloride Trihydrate (Declomycin Hydrochloride), C21H28O11N2Cl2

  • Frank N. Blanchard (a1) and Gus J. Palenik (a1)


Observed powder diffraction data for two tetracyclines were interpreted with the aid of calculated patterns based upon the crystal structures determined from a single crystal of the same batch for each compound. The results consist of high quality standard powder patterns with the usual supporting data.



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Appleman, D. E. & Evans, H. T. Jr., (1973). Indexing and least-squares refinement of powder diffraction data. Report PB 216188, U.S. Dept. of Commerce, National Technical Information Service, 5285 Port Royal Rd., Springfield, VA 22151.
Palenik, G. J., Mathew, M. & Restivo, R. (1978). Structural studies of tetracyclines. Crystal and molecular structures of anhydrotetracycline hydrobromide monohydrate and 6-demethyl-7-chlorotetracycline hydrochloride trihydrate. J. Am. Chem. Soc., 100, 44584464.
Smith, D. K., Nichols, M. C., and Zolensky, M. E. (1983). POWD 10: a FORTRAN IV program for calculating X-ray powder diffraction patterns - version 10. The Pennsylvania State University, University Park, Pennsylvania.
Smith, G. S. and Snyder, R. L. (1979). F(N): a criterion for rating powder diffraction patterns and evaluating the reliability of powder pattern indexing. J. Appl. Crystallogr., 12, 6065.
Visser, J. W. (1969). A fully automatic program for finding the unit cell from powder data. J. Appl. Crystallogr., 2, 8995.


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