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- W1996968497 abstract "Abstract The existence of double salts 2Me+X · Me2+X2 · 2H2O (where Me+ = Na, K, NH4, Rb, Cs; Me2+ = Mn, Fe, Co, Ni; X- = halide ion) is explained by the stability of [Me2+(H2O)2X4]2- complexes and by the most probable spatial distribution of the [Me2+(H2O)2X4]2- and the Me+ ions, The stability of the [Me2+(H2O)2X4]2- complexes is discussed on the basis of the hard-soft factor. The most probable distribution of the [Me2+(H2O)2X4]2- and the Me+ ions is determined by the radius-ratio conditions: i. Me+ in a surrounding of 8 X- ions r Me + /r X - = 0.73-1.00, ii. Me2+ with an octahedral coordination environment of 4X- and 20w 6r Me 2+ /(4r x + 2r O w ) = 0.41-0.73. The crystal structure type (tetragonal or triclinic) depends on an additional condition: r Me + = tr O w . When the tolerance factor t = 0.90-1.03, a tetragonal structure will be formed, while when t > 1.03, a triclinic structure should appear. The available literature data for this type of double salts as well as our studies on the systems KBr-MnBr2-H2O and NH4Br-NiBr2-H2O at 25°C described in this paper confirm the above conclusion. In the system NH4Br-NiBr2-H2O at 25°C a new double salt was found, namely NH4Br · NiBr2 · 6H2O (a = 6.835(1) A, b = 13.668(3) A, c = 6.834(1) A, β = 91.08(1)°, V = 638.3(2) A3, space group P21/n)." @default.
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- W1996968497 date "1994-02-01" @default.
- W1996968497 modified "2023-09-23" @default.
- W1996968497 title "On the Existence of the Double Salts 2Me+X · Me2+X2 · 2H2O" @default.
- W1996968497 doi "https://doi.org/10.1006/jssc.1994.1033" @default.
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