Preparative, potentiometric and NMR studies of the interaction of beryllium(II) with oxalate and malonate. X-ray structure of K3[Be3(OH)3(O2C–CH2–CO2)3]·6H2O

Beryllium binding to adenosine 5′-phosphates in aqueous solution at 25°C

“…Note that the coordination sphere of beryllium will be completed by water molecules which are not shown in the structures. Although the agreement with published stability constants is poor, we believe that the present results are correct because of the consistency of the models for AMP, ADP and ATP, not only amongst themselves, but also with the models proposed for other ligands such as oxalate, malonate, succinate [13,24], phosphonoacetate and methylenediphosphonate [25]. The stability constants for formation of [BeL] (zÀ2)À and [Be(HL)] (zÀ3)À increase in the order AMP 5 ADP 5 ATP, that is, with the length of the polyphosphate chain and the overall charge.…”

“…The stoichiometry of the species [Be 3 L 3 ] (3zÀ6)À is misleading as it is really a complex of the hydrolytic trimer [Be 3 (OH) 3 ] 3þ and could be written as [Be 3 (OH) 3 (HL) 3 ] (3zÀ6)À (scheme 2). Similar complexes of [Be 3 (OH) 3 ] 3þ have been identified with other ligands [13,24]. Note that the coordination sphere of beryllium will be completed by water molecules which are not shown in the structures.…”

Beryllium binding at neutral pH: The importance of the motif

“…This assignment is supported by 9 Be NMR results with the HMGA ligand (HMGA only supports binding in two six-member rings) that show only one peak at 1.9 ppm. These NMR values compare well to other polycarboxylic acids, such as malonate and oxalate, where oxalate (forming a five-member ring with Be) was downfield from malonate (forming a six-member ring with Be) [25]. Although, the malonate/oxalate:Be species were depended on the ligand to Be ratio unlike the CA:Be species and were less stable at higher pH.…”

9Be and 31P NMR analyses on the influence of imino groups on Be2+ complex stabilities of a series of cyclo‐μ‐imido triphosphate anions

“…Be(OH) + , Be(OH) 2 , Be 2 (OH) 3+ , Be 3 (OH) 3 3+ , and Be 6 (OH) 8 4+ . The 9 Be NMR signals of the Be 2+ hydrolysis product tend to appear in the low magnetic field than 0 ppm; however, any 9 Be NMR signal has not been detected in such a low magnetic field in this study. Furthermore, more straightforward evidence for the negligibleness of the hydrolysis of Be 2+ ion is the pH dependence of 9 Be NMR spectra; that is, the 9 Be NMR spectra of Be 2+ ‐cP 3 O 9− n (NH) n 3− ( n = 1, 2) mixture solutions obtained in the alkaline side than pH 4.5 were almost the same as the spectra obtained at pH 4.5 as shown in Fig.…”