Potentiometric studies on the ternary systems beryllium-iminodiacetic acid-dicarboxylic or hydroxy acids

Electrospray Ionisation Mass Spectrometric (ESI MS) Screening and Characterisation of Beryllium Complexes with Potentially Encapsulating Aminopolycarboxylate and Related Ligands

“…Additional ions include [L –H ] – and [HSO 4 ] – at m/z 132 and m/z 97, respectively, while the signal at m/z 97 was observed as the most prominent negative ion as shown in the illustrative mass spectrum in Figure (b). Importantly, the speciation information provided by the ESI mass spectra of the Be 2+ /IDA system is in good agreement with potentiometric speciation data which have shown the [L –2H BeOH] – species to be the most prominent species when employing beryllium perchlorate as the source of Be 2+ , . Contrary to the perchlorate ion ClO 4 – , the sulfate group SO 4 2– has been observed elsewhere to bind strongly to the beryllium cation .…”

“…Importantly, the speciation information provided by the ESI mass spectra of the Be 2+ /IDA system is in good agreement with potentiometric speciation data which have shown the [L -2H BeOH]species to be the most prominent species when employing beryllium perchlorate as the source of Be 2+ . [24,25] Contrary to the perchlorate ion ClO 4 -, the sulfate group SO 4 2has been observed elsewhere to bind strongly to the beryllium cation. [26][27][28] Other ions detected in the negative ion mode at lower intensities include [BeL -3H ]and [Be(L -H )(L -2H )]at m/z 139 and 272 respectively.…”