Beryllium stability constant

Stability Constants for Beryllium Complexes with Inorganic Ligands... 

Stability Constants of Some Substituted Malonato and Related Beryllium(II) Complexes ... 

Stability Constants for Some Aminopolycaeboxilato Complexes of Beryllium(II) ... 

Stability Constants for Some Beryllium(II) Complexes Determined by NMR Spectroscopy ... 

The structure of bis(salicylaldoxime)beryllium has been proposed as being trans octahedral by comparison of the space group and unit cell volume with those of related transition metal complexes it is presumably a dihydrate if it is indeed octahedral in geometry.297 Stability constants have been reported for a range of beryllium /3-ketoamines derived from both salicylaldehyde and acetylacetone precursors. They show strong complexes which are stable to hydrolysis under the conditions used.298,299... 

Table 2 Stability constants for aliphatic bidentate complexes of beryllium...

The stability constant and enthalpy of reaction derived for each beryllium species can be used together with the Gibbs energy and enthalpy of formation given for Be in the literature (Bard, Parsons and Jordan, 1985 Renders and Anderson, 1987) and that for H2O listed in Chapter 5 to derive the Gibbs energy and enthalpy of formation values for each species. These can then be coupled with literature entropy data (Grenthe etal., 1992) to derive the respective entropy values. These thermodynamic data are Usted in Table 7.1. 

Soboleva etal. (1977) also provided data on the solubility of bromellite (BeO(s)). They studied the solubility of this phase over the temperature range of 150-250 °C but provided thermodynamic data over the larger range of 25-300 C. From the solubility study, they provided data for the stability constants of the beryllium hydrolysis species, BeOH", Be(OH)2(aq) and Be(OH)3 , as well as that of the... 

Table 7.3 Data for the stability constants of beryllium monomeric hydrolysis species (reaction (2.5), M = p = 1). 

Data reported for the stability constant of polymeric beryllium hydrolysis species are listed in Table 7.4. For the majority of species, the data cover a relatively narrow range of temperature. Data have also been acquired for the enthalpy of reaction for all of the polymeric species that are believed to form. The accepted species include Be20H , Be3(OH)3 ", Beg(OH)g and Beg(OH)g. ... 

There are four stability constants available for the Beg(OH)3 species in perchlorate media at ionic strengths ranging from 0.5 to 3.0 mol dm . The agreement between the data is somewhat poorer than for the other polymeric beryllium species. All data measured in perchlorate media have been retained in this... 

There have been three studies that have used calorimetry to determine the enthalpies of reaction of the polymeric beryllium hydrolysis species (Carell and Olin, 1962 Ishiguro and Ohtaki, 1979 Alderighi et al., 1998). In addition, Mesmer and Baes (1967) measured the stability constants of these species over the temperature range of 0-60 "C from which the enthalpies of reaction were deduced. Finally, Ciavatta and Grimaldi (1973) determined the polymeric stability constants at 60 "C and in 3 moll NaClO. The stability constant values obtained in their study can be compared with those obtained at 25 "C in 3 mol 1" NaClO and the enthalpy data of Carell and Olin (1962) acquired under the same conditions. These data are presented in Table 7.6. 

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