Beryllium fluorides substitution

What the high concentration of fluoride in the solution does is to induce the formation of a soluble tetracoordinated state of aluminum, which has the same geometry, size, and coordination as a phosphate. Among many metals tested in the presence of fluoride, Sternweis and Gilman [14] found that only beryllium could substitute for aluminum for the activation of adenylate cyclase. This fact reinforced the assumption that aluminum acts through its tetrahedral phosphate-like complex AlF4 1, because all beryllium complexes are tetracoordinated [16]. 

BERYLLIUM DIFLUORIDE or BERYLLIUM FLUORIDE (7787-49-7) BeFj Mixture with water form an acid solution. Incompatible with acids, caustics, chlorinated hydrocarbons, oxidizers, molten lithium, magnesium Aqueous solution is incompatible with organic anhydrides, acrylates, aleohols, aldehydes, alkylene oxides, substituted allyls, cresols, eaprolactam solution, epiehlorohydrin, ethylene dichloride, glycols, isocyanates, ketones, maleie anhydride, nitrates,... 

Effect of substitution of sodium for Li. In the event that Li should prove not to be available in quantity, it would be possible to operate the reactor with mixtures of sodium and beryllium fluorides as the basic fuel salt. The penalty imposed by sodium in terms of critical inventory and regeneration ratio is shown in Fig. 14-8, where typical Na-Be systems are compared with the corresponding Li-Be systems. With no thorium in the core, the use of sodium increases the critical inventory by a factor of 1.5 (to about 300 kg) and lowers the regeneration ratio by a factor of 2. The regeneration penalty is less severe, percentagewise, with 1 mole % ThF4 in the fuel salt in an 8-ft-diameter core, the inventory rises from 800 kg to 1100 kg... 

The superior coordinating capacity of phosphonate over carboxylate is illustrated in the 9Be NMR spectra in Fig. 25 (260). The similarity of the spectra obtained by reaction of BeS04 and methylphosphonic acid or phosphonacetic acid indicates that the carboxylate group is not bound to the beryllium under these experimental conditions. It should be noted that substitution of a water molecule by a phosphonate ligand causes the 9Be resonance to move upfield when it co-ordinates, as does the fluoride ion (271), the only other monodenate ligand... 

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