Copper(I) nitrate pi-complexation: Synthesis and crystal structure of [{CH2=CH-CH2-NHC(NH2)(2)}Cu(NO3)(2)] compound

By alternating-current electrochemical synthesis, a crystalline pi-complex [{CH2=CH-CH2-NHC(NH2)(2)}Cu(NO3)(2)] (I) has been obtained using copper(II) nitrate and allylguanidine (AGU) in butanol-2 solution and copper-wire ele ctrodes. A single crystal of the compound was X-ray structurally characteri zed. The Cu ion possesses trigonal pyramidal coordination formed by two oxy gen atoms of the two nitrate anions and C=C bond of the H(+)AGU cation at t he equatorial plane and the oxygen atom of another nitrate anion at the api cal position. Owing to the bridging function of NO3-group, the structure I consists of chains connected by branched system of (N)H...O bonds of 2.19(4 )-2.45(3) Angstrom. New stereochemical features of coordinated nitrate anio n in copper(I) n-complexes have been revealed.