Copper(I) π-complexes with allyl derivatives of guanidine.: Synthesis and crystal structure of [(CH2=CH-CH2-NH-)2C-NH2]Cu2Cl3-xBrx (x=1.36)

Ac electrochemical synthesis was used to prepare crystals of the [(CH2=CH-CH2-NH-)(2)C-NH2]Cu2Cl3-xBrx (x = 1.36) compound (I), and its structure was determined [a DARCh diffractometer, MoKalpha radiation, a = 9.694(3), b = 8,754(2), c = 7.971(3) Angstrom, alpha = 100.27(2)degrees, beta = 95.39(3)degrees, gamma = 100.74(2)degrees, V = 6 18.3(7) Angstrom(3), space group P (1) over bar, Z = 2, R = 0.050 for 1175 independent reflections with F greater than or equal to 4 sigma(F)]. The coordination sphere of one of the copper atoms is a distorted tetrahedron formed from three halogen atoms and the C=C bond, and that of the other copper atom is planar-trigonal and consists of two halogen atoms and the C=C bond. The lengths of the coordinated double bonds of both allyl groups are equal to 1.34(2) Angstrom. Complex I is structurally similar to the previously studied pi-complex of diallylammonium [(C3H5)(2)NH2]Cu2Br3.