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)NO 3 ]NO 3 ( 1 ), [Cu(Hapn)(H 2 O) 2 ]SiF 6 ( 2 ), [Cu(Hapn)(H 2 O)BF 4 ]BF 4 ·H 2 O ( 3 ) and [Cu(Hapn)(NH 2 SO 3 ) 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(NO 3 ) 2 ∙3H 2 O, CuSiF 6 ∙4H 2 O, Cu(BF 4 ) 2 ∙6H 2 O or Cu(NH 2 SO 3 ) 2 ∙xH 2 O, 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 ciano group from another Hapnmoiety, and two O atoms (from NO 3 – anions in 1 , from H 2 O molecules in 2 ) or N atoms (NH 2 SO 3 – 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 Hapncation, nitrogen atom (of cyano group) of another Hapn unit, O atom of H 2 O molecule in the basal plane, and F atom of BF 4 – anion at the apical position.