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In the title complex, [Cu(C2H8N2)2(H2O)2](C13H9O2)2·2.66H2O, the CuII centre (located at an inversion centre) is coordinated by two bidentate ethyl­enediamine (en) ligands and two water O atoms in a typical Jahn–Teller distorted octahedral geometry. The amino groups and the water mol­ecules are disordered over two distinct crystallographic positions with occupancies of 1/3 and 2/3. In the crystal, the cations and anions are disposed in alternating layers. One of the water mol­ecules of crystallization is disordered and the other has a fractional occupation. In the 2/3 occupancy component, water mol­ecules are organized into a chain composed of hexa­meric units inter­connected by carboxyl­ate bridges.
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