Complexation of the Fe(III) and Fe(II) sulphates with diphenyl-4-amine barium sulphonate (DAS) Synthesis, thermogravimetric and spectroscopic studies

Abstract

Reactions in aqueous-alcoholic solution between diphenyl-4-amine barium sulphonate (Ba-DAS-anionic surfactant) and the hydrated sulphates of Fe(III) and Fe(II) ions and their use to ovtain iron oxides are described here.

Oxysulfate/oxysulfide of Tb3+ obtained by thermal decomposition of terbium sulfate hydrates under different atmospheres

“…ion, allowing it to establish a greater interpenetration with ligands as compared to Ba 2? ion [15,16]. In addition, the FTIR spectrum of the Tb(DAS) 3 Á2H 2 O compound shows strong absorption bands at 1143 and 1013 cm -1 (twist in Wavenumber/cm -1 Fig.…”

“…Moreover, the presence of other absorption bands at 1006, 984 and 850 cm -1 in the FTIR spectrum of Tb 2 (SO 4 ) 3 Á8H 2 O can be attributed to the alteration in the tetrahedral (T d ) geometry of sulfate ion [15][16][17][18][19][20].…”

“…ion. Thus, the decline in the number of these bands in complex Tb(DAS) 3 Á2H 2 O spectrum can be related to the lowering of the group symmetry to C 2 v or Cs [15,16,21]. This is because of the fact that Tb 3?…”

“…These compounds are often used in nanotechnology [1][2][3][4][5], also as luminescent materials [6,7], semiconductors [8], X-ray spectroscopic probes and gas absorbing agents [9][10][11][12]. These compounds can exist in various stable forms such as lanthanum oxydisulfide Ln 2 OS 2 , dioxysulfide Ln 2 O 2 S, oxydisulfate Ln 2 O(SO 4 ) 2 and dioxysulfate Ln 2 O 2 SO 4 , as well as lanthanum oxide Ln 2 O 3 [1,2,4,[13][14][15]. These varieties of products can be achieved because of the ability of sulfonate anion to organize as a mono-, bi-and tridentate ligand around the metal ion.…”

“…The combination of these effects can influence the ligand, making it a reducing agent for some highly positively charged metal ions as well as act as a species capable of stabilizing less positively charged metal ions. The thermal stability and morphological characteristics of the produced compounds depend on certain factors such as the synthesis conditions, heat treatment and the atmosphere used in the decomposition process [15,16].…”