Structural study of copper and chromium poly[3,3′-dithiobis(2,4-pentanedionates)]

The structures of copper poly[3,3′-dithiobis(2,4-pentanedionate)], obtained from 3,3′-dithiobis(2,4-pentanedione) and copper chloride, and chromium oligo-3,3′-dithiobis(2,4-pentanedionate), obtained by treating chromium tris(3-chlorosulfenyl-2,4-pentanedionate) with butyl magnesium bromide, are studied by comparing the calculated and experimental X-ray scattering functions. Optimal models for the copper and chromium polychelate structures are suggested. The structure of the macromolecular chain depends on the mutual arrangement of metallochelate nuclei, which is similar to that in a crystal matrix of a monomer, rather than on the stereochemistry of the disulfide bond.