Iron(III) acetates

Abstract

The compound, Fe2CIa(OH)2(MeCO2)2 " 2MeCO2It " H20, combines with lithium and silver acetates to form Fe2CI(OH)2(MeCO2)3 " 2MeCO2t-I and Fe2(OH)2(MeCO2)4 • H20, respectively. Iron(Ill) chloride in tetrahydrofuran reacts with silver acetate to give a precipitate consisting of a mixture of Fe(MeCO2)3 and AgCI which, when extracted with boiling acetic acid, yields " To whom all correspondence should be addressed. Fe202(MeCO2)2 3MeCO2H. With DMSO on theother hand an adduct Fe(MeCO2)3 • DMSO is formed which loses DMSO in vacuo to give ferric acetate, Fe(MeCO2)3. l.r. spectra, molar conductance, thermal decomposition, molecular weight and magnetic susceptibility measurements are reportcd.

Analysis on development of magnetite hollow spheres through one‐pot solvothermal process

“…These peaks became sharper with the increase of processing time and all peaks were clearly observed after 8 h. Figure 4 presents the FTIR spectra of particles prepared for different processing times. Samples obtained until 6 h showed the gradually reduced absorption peaks at 1576 cm 21 , 1445 cm 21 and 1089 cm 21 with time due to asymmetric, symmetric stretching of the COOA group and CAO stretching of the COOA group, respectively. 20 Several peaks below 800 cm 21 are attributed to Fe-O modes due to the mixed phase of Fe compounds.…”

“…A typical hysteresis loop was observed for all samples after 1 h, indicating a ferromagnetic behavior at room temperature. After 12 h, the hollow spheres showed a saturation magnetization of 81 emu g 21 , a remanent magnetization of about 22 emu g 21 and coercivity of about 200 Oe. The assembly of numerous small grains into hollow spheres built a multidomain structure of hollow spheres and, thus, caused the ferromagnetic behavior.…”

“…20 Several peaks below 800 cm 21 are attributed to Fe-O modes due to the mixed phase of Fe compounds. 21,22 The peak at 530 cm 21 is assigned to the hydroxyl-bridge of FeAOH. 21,22 These indicate that chloride (ACl) groups in iron precursors were substituted after 0.5 h by hydroxyl (AOH) and acetate (AAc) groups which have higher affinities to Fe (III) ions than chloride to give a precipitate.…”

“…21,22 The peak at 530 cm 21 is assigned to the hydroxyl-bridge of FeAOH. 21,22 These indicate that chloride (ACl) groups in iron precursors were substituted after 0.5 h by hydroxyl (AOH) and acetate (AAc) groups which have higher affinities to Fe (III) ions than chloride to give a precipitate. Some water molecules which were derived from Fe precursor (FeCl 3 Á6H 2 O) might adsorb on the precipitate grains and act as the binder for the further assembly between grains to form the large-sized spheres.…”

“…The thickness of the deposited multilayers was controlled by either the number of adsorption cycles performed or the polyelectrolyte interlayer separation between each nanoparticle layer. Another study reported the synthesis of mesoporous magnetite hollow spheres by a direct chemical adsorption/precipitation of Fe 21 precursor on carboxyl-functionalized polystyrene templates. 8 The hollow core diameter was mainly determined by the diameter of the polymer beads and the thickness of the magnetite shell layer was controlled by the concentration of the Fe precursor.…”