STRUCTURE AND PROPERTIES OF DOUBLE COMPLEX SALTS [Co(NH3)6][Fe(CN)6] AND [Co(NH3)6]2[Cu(C2O4)2]3

Double complex salts (DCSs) [Co(NH3)(6)][Fe(CN)(6)] (I) and [Co(NH3)(6)](2) [Cu(C2O4)(2)](3) (II) and complex [Co(NH3)(6)](2)(C2O4)(3)center dot 4H(2)O (III) are synthesized and investigated by single crystal XRD, crystal optics, and elemental analysis. The crystalline phases of I, II, and III (R-3, P2(1)/c, and Pnnm space groups respectively) have the following crystallographic characteristics: a = 10.9804(2) angstrom, b = 10.9804(2) angstrom, c = 10.8224(3) angstrom, V = 1130.03(4) angstrom(3), Z = 3, d(x) = 1.65 g/cm(3) (I); a = 9.6370(2) angstrom, b = 10.2452(2) angstrom, c = 13.2108(3) angstrom, V = 1932.90(9) angstrom(3), Z = 2, d(x) = 1.97 g/cm(3) (II), and a = 11.7658(3) angstrom, b = 11.7254(3) angstrom, c = 14.1913(4) angstrom, V = 1304.34(5) angstrom(3), Z = 2, d(x) = 1.68 g/cm(3) (III). This paper investigates the products of DCS thermolysis in a hydrogen atmosphere: the intermetallic compound CoFe with the bcc parameter a = 2.852 angstrom for I and a heterogeneous mixture of Co and Cu in the decomposition of II. The coordinated CN- and C2O42- groups then turn into NH3, hydrocarbons, and CO2. The dominant hydrocarbon is methane.