Crystal data for ammonium thiosulphate: (NH₄)₂S₂O₃

Abstract

Ammonium thiosulphate is monoclinic with cell dimensions a = 10"282 (9), b = 6-541 (6), c = 8"766 (9) A,/3 = 95-49 (9) ~, space group C2, Cm or C2/m. Powder data are given. Chemical characterizationThe crystals of ammonium thiosulphate of purity>_97% (RT), stabilized with 1% sodium sulphite, were obtained from FLUKA. Crystal dataThe hygroscopic crystals were placed in Lindemann tubes and examined by the oscillation and Weissenberg methods with Cu K~ radiation. It was verified that the crystals belong to the monoclinic system. Systematic absences in hkl with h + k = 2n + 1 and hOl with h = 2n + 1 indicate that the space group is C2, Cm or C2/m. Lattice parameters (Table 1) were calculated by the least-squares method from the d spacings (Table 2) obtained from photographically recorded powderpattern measurements. The radiation used was Cu K~I (2= 1.54051 A,), and the temperature was 298 K. The program CELCIUS (Tegenfeldt, 1967) was used for the calculation. Indexing was based on preliminary cell dimensions obtained from the single-crystal photographs. Experimental density was determined by flotation. Table 1. Crystal data for (NH4)2S2O 3 Monoclinic C2, Cm or C2/m a= 10-282 (9), b=6"541 (6), c= 8"766 (9) A /3 = 95-49 (9) ° V=589"5 A 3, Z=4 Dx = 1"670, D,,, = 1"679 g cm-3

Geochemical study of products associated with spontaneous oxidation of coal in the Cerro Pelado Formation, Venezuela

“…In addition, neither ammonium thiosulfate nor potassium ammonium aluminum sulfate hydrate are actually formed as minerals by other geological processes. However, both compounds have been reported as synthetic crystalline phases (Elerman et al,1978;Smith, 1979;Troemel, 1997).…”

Thiosulfates

“…The anhydrous monoclinic crystalline form has a density of 1.679 g/cm 3 (59); no hydrates are known. Solubility in water is given in Table 4.…”