Mössbauer and XRD investigations of layered double hydroxides (LDHs) with varying Mg/Fe ratios

Mössbauer, XRD and TEM Study on the Intercalation and the Release of Drugs in/from Layered Double Hydroxides

“…A tilted vertical arrangement of a single row of anions may be a possible orientation as depicted in Figure 4, when the charge distribution can be somewhat similar to that occurring for the indole-2-carboxylate-intercalated CaFe-LDH prepared in aqueous acetone solution. [20] This model is also supported by the Mössbauer results ( Table 2).…”

“…The gallery height can be calculated to be ∼0.58 nm (by substracting the thickness of the basal layer from the measured basal spacing). In the present case, however, considering the dimensions of the indole-2-carboxylate anion (0.50 × 0.30 × 0.78 nm [20] ), there is not enough space to fit two horizontal rows of molecules in the interlayer of CaFe-LDH. A tilted vertical arrangement of a single row of anions may be a possible orientation as depicted in Figure 4, when the charge distribution can be somewhat similar to that occurring for the indole-2-carboxylate-intercalated CaFe-LDH prepared in aqueous acetone solution.…”

“…All spectra were satisfactorily decomposed into a doublet in accordance with the evaluation of Mössbauer spectra of other LDHs. [18][19][20] The Mössbauer parameters are depicted in Table 2.…”

“…[14] 57 Fe Mössbauer spectroscopy [15,16] is a useful technique to characterise LDHs, in which Fe 3+ ions are constituents of the layers. In our previous works on LDHs, [17][18][19][20] Mössbauer spectroscopy revealed whether the iron was in the LDH structure formed or not [17] when the Ca : Fe [18] or Mg : Fe [19] ratios were altered. It could also provide with structural information when different organic anions were intercalated into a CaFe LDH.…”

“…It could also provide with structural information when different organic anions were intercalated into a CaFe LDH. [20] In this paper, the syntheses of two functional nanocomposites are described using CaFe-LDH as nanocarrier and cysteinate or indole-2-carboxylate as anionic intercalated drugs. The effects of sodium carbonate on the release of drugs are examined and characterisation of the obtained substances is given by XRD, TEM and 57 Fe Mössbauer spectroscopy.…”