Identification of hydrolysis products of FeCl₃ · 6H₂O by ESI‐MS

Abstract

The hydrolysis reactions of FeCl3 in 0.1 mM aqueous solutions were monitored by electrospray ionisation time-of-flight mass spectrometry (ESI-ToF-MS). In contrast to the other ionisation techniques, electrospray ionisation provides information on the composition of the elemental cores even in water and salt cluster ions. Therefore, the technique facilitates detection of the bonding of the chloride ions in the oxo-hydroxo-iron cores. A variety of mononuclear and polynuclear iron-oxohydroxo-chloride complexes were characterised from the cationic and anionic mass spectra of iron(III) solutions. Oxidation and reduction reactions of iron, as well as competition between OH- and Cl- ions within one iron core, were also observed.

Colloidal surfaces and oligomeric species generated by water treatment chemicals

“…Details of the MS analyses have been presented in our previous publications (Sarpola et al, 2004;Hellman et al, 2006) and these were followed here strictly. The MS technique used, Micromass LCT with Z-spray electrospray interface, can distinguish between soluble cationic and anionic species with molecular mass to charge ratio (myz) over 100.…”

Influence of Copper Salts, Solvents, and Ligands on the Structures of Precatalytic Phosphoramidite Copper Complexes for Conjugate Addition Reactions

“…[41] ESI mass spectra: Electrospray ionization-mass spectrometry (ESI-MS) is a soft and direct method for transferring ions pre-existing in solutions into the gas phase. [42] The energy imparted to the ions is quite low compared to that in conventional spectrometric ionization techniques. However, under the anaerobic conditions in the capillary and with fewer stabilizing solvent molecules, this energy is often still high enough to induce the loss of a ligand or of a metal ion, or the fragmentation of the molecular ion.…”

“…However, under the anaerobic conditions in the capillary and with fewer stabilizing solvent molecules, this energy is often still high enough to induce the loss of a ligand or of a metal ion, or the fragmentation of the molecular ion. [42] Therefore, for every new system, the question arises as to whether the ions detected by the ESI-MS technique really reflect the complexes in solution. If a correlation is possible, ESI-MS is a very fast, sensitive, and inexpensive tool.…”

Mn(VII)–Fe(II) pre-treatment for Microcystis aeruginosa removal by Al coagulation: Simultaneous enhanced cyanobacterium removal and residual coagulant control

“…No new species appeared in the spectra after 2 min, with the relative intensities of each species remaining constant ( Table 2). The largest peak at m/z 275 was associated with ½Fe III 2 ðOHÞOSO 4 $ðH 2 OÞ n þ , indicating the higher stability of water series (Table 1) than primary species during Fe(III) hydrolysis (Hellman et al, 2006). As suggested by Hellman et al, this term 'water series' refers to multinuclear hydrolyzates of Fe those were coordinated water molecule(s).…”