Crystal structure of bis[diethylenetriamine-N′-(3-propionato)-N, N′,N″,O,O′]dicopper(II) Diperchlorate, [Cu2(4-Dtmp)2](ClO4)2

A complex of copper(II) with the diethylenetriaminemonopripionate ligand [Cu₂(4-Dtmp)₂](ClO₄)₂ (I) is synthesized and characterized using X-ray diffraction. The crystals of compound I are monoclinic, a = 7.740(2) Å, b = 19.199(3) Å, c = 8.449(2) Å, β = 91.61(2)°, Z = 2, and space group P2₁/n. The structural units of crystal I are centrosymmetric dimeric cations and statistically disordered ClO ₄ ⁻ anions. In the cation, the copper atom is coordinated by three N atoms [mean Cu-N, 2.01(1) Å] and two O atoms [Cu-O, 2.134(6) Å and 1.958(7) Å] of the pentadentate bridging-chelate Dtmp ligand, which occupy vertices of the trigonal bipyramid. The binuclear cations are linked via centrosymmetric pairs of hydrogen bonds into ribbons aligned parallel to the a axis of the crystal. The ClO ₄ ⁻ anions form columns in the same direction. In the crystal, the cationic ribbons and anionic columns alternate in a chessboard fashion. __________ Translated from Kristallografiya, Vol. 50, No. 3, 2005, pp. 450–454. Original Russian Text Copyright ? 2005 by Antsyshkina, Sadikov, Poznyak, Sergienko.