Beryllium perchlorate

Beryllium perchlorate
Names
	Other names Beryllium diperchlorate;
Identifiers
CAS Number	13597-95-0; tetrahydrate: 7787-48-6;
3D model (JSmol)	Interactive image; tetrahydrate: Interactive image;
ChemSpider	25945741;
PubChem CID	14389538; tetrahydrate: 53471875;
UNII	3A00E42LVD;
CompTox Dashboard (EPA)	DTXSID00159608 ;
	InChI InChI=1S/Be.2ClHO4/c;22-1(3,4)5/h;2(H,2,3,4,5)/q+2;;/p-2 Key: MVTQSBYPNJATTN-UHFFFAOYSA-L; tetrahydrate: InChI=1S/Be.2ClHO4.4H2O/c;22-1(3,4)5;;;;/h;2(H,2,3,4,5);4*1H2/q+2;;;;;;/p-2 Key: TYWIVKBGKVAEHJ-UHFFFAOYSA-L;
	SMILES [Be+2].[O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O; tetrahydrate: [Be+2].O.O.O.O.[O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O;
Properties
Chemical formula	Be(ClO4)2
Molar mass	279.975 g/mol
Appearance	White solid
Melting point	140 °C (284 °F; 413 K) (decomposition, tetrahydrate)
Solubility in water	198 g/100 mL (25 °C, tetrahydrate)
Solubility	Soluble in acetone
Structure
Coordination geometry	Tetrahederal (Be)
Related compounds
Other cations	Magnesium perchlorate; Calcium perchlorate
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Beryllium perchlorate is an inorganic chemical compound with the formula Be(ClO₄)₂·nH₂O, where n is 2 or 4. All forms are white, hygroscopic, and water-soluble solids.

Synthesis and reactions

Beryllium perchlorate tetrahydrate, Be(ClO₄)₂·4H₂O, is produced from the reaction of beryllium oxide and concentrated perchloric acid followed by the evaporation of the solution:^[1]^[2]^[3]

BeO + 2 HClO₄ → Be(ClO₄)₂ + H₂O

The dihydrate can be similarly prepared by the reaction of beryllium chloride and hydronium perchlorate at 60 °C.^[4]

Heating of the tetrahydrate does not produce the anhydrous form; it instead decomposes at 140 °C, producing an unidentified basic beryllium perchlorate, and if this compound is heated to 260 °C, it decomposes to beryllium oxide. Similarly, if the dihydrate is heated to 200 °C, it decomposes to basic beryllium perchlorate (Be₄O(ClO₄)₆), which then decomposes at 270 °C to BeO.^[5]

The tetrahydrate and dihydrate dissolves in water to form the [Be(H₂O)₄]²⁺ ion, which then partially hydrolyzes to the trimeric ion [Be₃(OH)₃(H₂O)₆]³⁺. They also dissolve in acetone which then can react with triphenylphosphine oxide to form Be(OPPh₃)₄(ClO₄)₂.^[3]^[6]