X‐Ray diffraction of ethylenediamine–amylose complex

Solutions of amylose in ethylenediamine yield a crystalline film complex upon evaporation of solvent. The x‐ray analysis indicates the presence of a tetragonal‐shaped cell with a symmetry approximating that of space group P212121. The amylose sixfold helix has a diameter of 13.3 Å and a translation period of 8.0Å. Chemical and physical analyses support a complexing ratio of one ethylenediamine molecule to every two glucose units. The structure is nearly identical to any amylose–dimethyl sulfoxide complex previously examined. The square mode of packing arrangement appears to result from complexation between amylose chains. Such complexing indicates a much greater degree of amylose interaction than is observed in amylose complex structures having a hexagonal close‐packing arrangement.