Influence of ethyl alcohol in the preparation, morphology and properties of compound DAS–Eu3+ and its thermal degradation products

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?…”

“…The observed changes in the absorption bands strengthen the suggested idea that the high positive charge and small size of the Tb 3? ion promote greater delocalization of electrons in rings toward oxygens of the sulfonate group [15][16][17][18][19][20][21]. This electronic factor can strengthen the interaction of ligands with the Tb 3?…”

“…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].…”