Studies on Aluminum Complex Compound of PAS. IV. X-Ray Studies on the Structure of Calcium Alumino-p-aminosalicylate

Abstract

Structural determination of the newly synthesized calcium alumino-p-aminosalicylate was not sufficiently made through chemical means and X-ray crystallographic studies were carried out. By taking oscillation and Weissenberg photographs, size of unit cells and space groups were determined. X-Ray method of calculating the molecular weight from unit cells gave values agreeing with a heptahydrate. Space group was C¹_i-P^-₁, which indicated the presence of a center of symmetry in the crystal but complete analysis of crystal structure was extremely difficult and therefore, in order to obtain some information of atomic arrangement in the crystal, projection of Patterson function towards the c axis (the shortest period) was made. Closer examination of the Patterson map, combined with packing considerations, revealed that a planar complex ion is possibly arranged parallel in the direction diagonal to the projected unit cell and inclined approximately 82∼83°from the plane of projection.