Synthesis and Structure of [Cu(Hapn)]NO3]NO3, [Cu(Hapn)(H2O)2]SiF6, [Cu(Hapn)(H2O)BF4]BF4 · H2O and [Cu(Hapn)(NH2SO3)2] π-complexes (apn = 3-(prop-2-en-1-ylamino)propanenitrile)

Four copper(I) π-complexes: [Cu(Hapn)NO3]NO3 (1), [Cu(Hapn)(H2O)2]SiF6 (2), [Cu(Hapn)(H2O)BF4]BF4·H2O (3) and [Cu(Hapn)(NH2SO3)2] (4) were prepared using alternating-current electrochemical technique, starting from alcohol solutions of 3-(prop-2-en-1-ylamino)propanenitrile (apn) titrated with appropriate acid and copper(II) salts (Cu(NO3)2 · 3H2O, CuSiF6 · 4H2O, Cu(BF4)2 · 6H2O or Cu(NH2SO3)2 · xH2O, respectively). Obtained compounds were characterized by single-crystal X-ray diffraction and partially by IR spectroscopy. In the structures of complexes 1, 2 and 4 Cu(I) cation possesses a tetrahedral environment formed by the C=C bond of one organic cation Hapn, the N atom of cyano group from another Hapn moiety, and two O atoms (from NO3- anions in 1, from H2O molecules in 2) or N atoms (NH2SO3- anions in 4). In compound 3 strongly pronounced trigonal-pyramidal coordination environment of Cu(I) is formed by a mid-point of C=C-bond of one Hapn cation, nitrogen atom (of cyano group) of another Hapn unit, O atom of H2O molecule in the basal plane, and F atom of BF4- anion at the apical position.