Copper(II) and Nickel(II) Complexes of 4-Methyl-4,7-diazadecane-1,10-diamine

The X-ray crystal structures of (4-methyl-4,7-diazadecane-1,10-diamine-N,N',N'',N''')(perchlorato-O)copper(II) perchlorate, [Cu(C₉H₂₄N₄)(ClO₄)]ClO₄, and (4-methyl-4,7-diazadecane-1,10-diamine-N,N',N'',N''')nickel(II) diperchlorate, [Ni(C₉H₂₄N₄)](ClO₄)₂, are isomorphous with minor dissimilarities. The copper(II) complex is six-coordinate in a distorted octahedral geometry with the four N atoms of the tetradentate ligand equatorial and the two O atoms of the perchlorate groups axial. The nickel(II) complex is four-coordinate in a square-planar geometry. In both complexes, the conformations of the three consecutive six-, five- and six-membered rings are chair, gauche and chair, respectively. In both crystals, hydrogen bonds involving the amino groups and perchlorate O atoms help stabilize the crystal structure.

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