Coordination chemistry of phosphonic acids with special relevance to rare earths

Functionalization of γ-Fe2O3 nanoparticles through the grafting of an organophosphorous ligand

“…This positive zeta potential is probably due, in addition to the positive charge from the surface of the ␥-Fe 2 O 3 nanoparticles at pH 5.15, to the protonation, at acidic pH, of the amine groups available at the surface of the nanoparticles. This phenomenon may compete with the deprotonation of the phosphonic head (pKa ∼ 3 and 6) [14] in the free ligands which are self assembled to the coordinated ligands via hydrogen interactions [21].…”

2D and 3D alkaline earth metal carboxyphosphonate hybrids: Anti-corrosion coatings for metal surfaces

“…When generated in situ, they act as corrosion inhibitors by creating anti-corrosive protective films on a carbon steel surface. Although the field of metal phosphonate chemistry is mature, there is still a plethora of opportunities in basic research [19] and other application areas [20]. The only limiting factor in further development of this field is phosphonate ligand availability through designed organic synthesis.…”

Application of zirconium phosphonate—a novel hybrid material as an ion exchanger

“…Aminophosphonic acids possess effectiveness of donor groups in the binding of tetravalent metal ions, and have received considerable attention due to the diverse binding abilities [13,14]. High surface area, porous titanium phosphonate materials for multiphase adsorption of metal ions [15,16] and with large ion exchange capacity [17] have been synthesized using 1-hydoxyethylidene-1,1-diphosphonic acid.…”