Abstract
Crystals of the [(H3NCH2C≡CC≡CCH2NH3)]Cu2Cl4 π-complex, formed in the oxidative dimerization of propargylammonium cations, were obtained by ac electrochemical synthesis from CuCl2 · 2H2O and propargylammonium chloride ([НC≡CCH2NH3]Cl) and studied by X-ray diffraction analysis (DARCh automated diffractometer, MoKα radiation, θ/2θ scan mode; 2275 reflections with F ≥ 4σ(F), R = 0.048). Crystals are monoclinic: space group B2/b, a = 19.591(6) A, b = 7.299(3) A, c = 8.636(3) A, γ = 106.83(3)°, Z = 4. The structure consists of individual [(H3NCH2C≡CC≡CCH2NH3)]Cu2Cl4 moietes united through the elongated Cu···Cl contacts (2.827(5) A) into chains oriented along the [010] direction. The С≡С bond of the centrosymmetric propargylammonium dimer is π-coordintated by copper(I) atom and is elongated to 1.227(6) A.
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