Copper(I) Hexafluorosilicate π-Complex with N-Allylmorpholinium Cation: A Rare Case of (C=C+3O) Copper(I) Coordination in the Structure of [Cu(C4H8ONH(C3H5))(H2O)2]SiF6•H2O

The [Cu(C4H8ONH(C3H5))(H2O)(2)]SiF6 center dot H2O compound (I) was obtained by alternating current electrochemical synthesis, starting from a solution containing CuSiF6 center dot 4H(2)O and N-allylmorpholinium hexafluorosilicate. Compound I crystallizes in a trigonal P 3(1) space group, a = 8.6449(4), c = 16.5629(11) angstrom, V = 1071.98(10) angstrom(3), Z = 3 for Cu(C7H14NO)SiF6 center dot 3H(2)O composition, R = 0.0569 for 2987 reflections and 182 refined parameters. The C=C bond of one N-allylmorpholinium cation, elongated to 1.38(1) angstrom, the O-atom from another ligand moiety, and two oxygen atoms from two water molecules form the trigonal-pyramidal environment of the metal atom. The bridging function of the ligand moiety results in infinite metal-organic chains. One more water molecule is fixed in the crystal space by hydrogen bonds only.