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. 2018 Apr 2;23(4):808. doi: 10.3390/molecules23040808

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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²⁷Al NMR of Al₂(SO₄)₃ with a concentration of 50.0 g/L at pH 5 (left) and 6 (right) recorded at the same conditions for the different media L1–4 and water. The signals at −2.4 ppm for the [Al(H₂O)₅SO₄]⁺ are no longer visible for all media. The signal at 0.9 ppm for the aluminium hexahydrate is detected only in the case of the water solution.The resonance at 5.2 ppm for the dimer is observed clearly in the water solution and significantly reduced in L1 medium. A new broadened ²⁷Al resonance at ca. 12 ppm appears instead. At pH 6, this broad signal remains only in the RPMI and DMEM media.