Molecular Complexes of Tetracycline Acid Salts

Part I. The Preparations and Properties of Tetracyclinium Salt-Oxalic Acid Complexes

Abstract

A series of studies on the crystalline molecular complexes of tetracycline groups have been carried out in this laboratory, and the present paper deals with the compositions of the oxalic acid complexes of various tetracycline acid salts, which were examined by X-ray powder diffraction methods, infrared spectra, and chemical analyses. Insertions of salt anions and crystal water in the crystal lattice of the complexes, and the important role of the latter for crystallization are indicated.