STRUCTURAL STUDY OF COPPER AND CHROMIUM POLY[3,3'-DITHIOBIS(2,4-PENTANEDIONATES)]

The structures of copper poly[3,3'-dithiobis(2,4-pentanedionate)], obt ained from 3,3'-dithiobis(2,4-pentanedione) and copper chloride, and c hromium oligo-3,3'-dithiobis(2,4-pentanedionate) obtained by treating chromium tris(3-chlorosulfenyl-2,4-pentanedionate) with butyl magnesiu m bromide, are studied by comparing the calculated and experimental X- ray scattering functions. Optimal models for the copper and chromium p olychelate structures are suggested. The structure of the macromolecul ar chain depends on the mutual arrangement of metallochelate nuclei, w hich is similar to that in a crystal matrix of a monomer, rather than on the stereochemistry of the disulfide bond.