A redetermination of bis(ethylenediamine-N,N′)bis(perchlorato-O)copper(II)

Reaction of copper(II) perchlorate with excess ethylenediamine (en) in aqueous solution gave the title complex, [Cu(ClO4)(2)(C2H8N2)(2)]. The cation is centrosymmetric with a mean Cu-N distance of 2.016 (2) Angstrom. There are semi-coordinate bonds to the perchlorate ions with a Cu-O distance of 2.579 (4) Angstrom. The N-Cu-N angle is 84.69(9)degrees, as expected for chelating en. The structure is stabilized by hydrogen bonds from three of the perchlorate O atoms to amino H atoms within each molecule and between molecules, linking them into chains.