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- W2018306404 abstract "The Al concentration and forced hydrolysis influence the polymerization of aqueous Al(III) and thus the 27Al NMR spectra. An increase of the Al concentration results in an increase of the fraction present as monomer, in the formation of an oligomer of an OH/Al molar ratio of 2.4, and in the disappearance of the tridecamer above an Al concentration of 0.15M. Increasing the OH/Al molar ratio at a constant Al concentration leads to a linear drop of the fraction present as monomer over the entire range between 1 and 2.5 and a maximum in oligomer fraction between 1.5 and 2.5. At low Al concentrations, the fraction of tridecamer exhibits an optimum yield between OH/Al ratios of 2.2 and 2.4. At ratios higher than 2.4, NMR unobservable polymers are formed. The chemical shift and the linewidth of the monomer resonance are lowered by increasing spin-spin relaxation, T2, and a consequently decreasing quadrupole coupling constant upon increasing Al concentration. With increasing OH/Al molar ratio, [Al(H2O)6]3+ is mainly replaced by [Al(H2O)5(OH)]2+ and [Al(H2O)4(OH)2]+ and subsequently the chemical shift and linewidth of the monomer resonance increase. The Al concentration or OH/Al molar ratio hardly affect the resonance of the central fourfold coordinated Al of the tridecamer, due to its very strong shielding." @default.
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- W2018306404 title "The effects of concentration and hydrolysis on the oligomerization and polymerization of Al(III) as evident from the 27Al NMR chemical shifts and linewidths" @default.
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