Synthesis and structure of the copper complex [(H2NCH2CH2NH2)2Cu(H2O)2] [O2CNHCH2CH2NHCO2] ∙ 2H2O
Keywords:
copper dichloride, ethylenediamine, potassium dicyanoargentate, synthesis, complex, structure, X-ray diffraction analysisAbstract
A by-product of the reaction of copper dichloride with ethylenediamine and potassium dicyanoargen-tate is a hydrate of the ionic copper complex with ethylenediamine-N,N'-dicarboxylate anion [(H2NCH2CH2NH2)2Cu(H2O)2][O2CNHCH2CH2NHCO2]∙2H2O (1), the structure of which was con-firmed by X-ray diffraction analysis (T = 100.15 K; C8H30CuN6O8, M = 401.92; monoclinic syngony, space group I2/a; cell parameters: a = 10.1348(2) Å, b = 9.5983(2) Å, c = 17.7734(4) Å; α = 90.00, β = 97.879(2), = 90.00, V = 1712.62(6) Å3, Z = 4; calc = 1.559 g/cm3; = 2,261 mm–1; F(000) = 852.0; collection area by 2q: 10.04140°; total reflections 6665; independent reflections 1625, Rint = 0.0168; GOOF = 1.073; R-factor 0.0229). The [(H2NCH2CH2NH2)2Cu(H2O)2]2+ cation consists of an octahedrally coordinated copper atom with four nitrogen atoms (Cu–N 1.9997(12)–2.0341(11) Å) of two ethylenediamine mol-ecules in the equatorial plane and two oxygen atoms (Cu–O 2.5356(11) Å) of two water molecules in axial positions. In the centrosymmetric [O2CNHCH2CH2NHCO2]2– anions, the carboxyl carbon atoms and nitrogen atoms have an almost undistorted trigonal geometry of the environment. The NCCN tor-sion angles in the ethylenediamine ligands are ±52.73(14)°. The crystal organization of 1 is caused by hydrogen contacts O–H∙∙∙O (1.86–2.48 Å), N–H∙∙∙O (2.00–2.27 Å), and C–H∙∙∙O (2.63 Å). Complete ta-bles of atomic coordinates, bond lengths, and bond angles for compound 1 have been deposited with the Cambridge Crystallographic Data Centre (CCDC 2361514) and are available, free of charge, at de-posit@ccdc.cam.ac.uk and http://www.ccdc.cam.ac.uk.References
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