Erbium bromide

CuCI2 COPPER DICHLORIDE 610 ErBr3[g] ERBIUM BROMIDE (GAS) 654... 

Erbium bromide hexahydrate ErBf3 6H3O 14890-44-9 616.062 pink cry sH,0... 

In aqueous solution, erbium is always trivalent, Er3+. It forms water-insoluble trivalent salts, such as fluoride, ErFs, carbonate, Er2(COs)2, hydroxide, Er(OH)3, phosphate, ErP04, and oxalate Er2(C204)s. It also forms water-soluble salts, chloride, ErCls bromide, ErBrs iodide, Erls sulfate, Er2(S04)s and nitrate, Er(NOs)3. Evaporation of solutions generally yields hydrated salts. 

The isostructural solutions formed by yttrium(III) and erbium(III) have been used to study the structures of their halide complexes in aqueous solutions at different concentrations (35). The RDFs for some erbium(III) bromide and chloride solutions with different metal ion concentration and halide to metal ratios are given in Fig. 20 after elimination of the nonmetal interactions. For comparison those of three perchlorate solutions of similar concentrations are also given. For all of these solutions the peaks at 2.35 A, which correspond to the inner coordination sphere of the metal ion, are nearly the same and are closely reproduced by a theoretical peak calculated for 8.0 Er-H20 interactions. This indicates that the anions do not penetrate the first... 

Fig. 20. RDFs for some aqueous perchlorate, chloride, and bromide solutions of erbiu-m(III) after elimination of nonmetal interactions. A and B solutions are 1M in erbium(III), with anion to Er ratios of about three (A) and nine (B). C solutions are about 3 M in Er.

Fig. 21. An analysis of the first and second coordination spheres for 1 M erbium(III) bromide solutions with Br/Er ratios of three (BrA) and nine (BrB) by a comparison with theoretical Er-H20 and Er-Br peaks. Parameter values are given in Tables III and IV.

The Structure of the Second Coordination Sphere in Some Erbium(III) Chloride and Bromide Solutions0... 

Erbium tribromide at 1095 K contains just a small amount of dimer, for which reliable geometrical parameters could not be obtained, so only the monomer structure has been determined. The values for the Er-Br distance and BrErBr angle (vg parameters) are 258.2(6) pm and 116.0(14)°, and it is concluded that if shrinkage is taken into account the equilibrium structure is planar or very nearly so. Erbium trichloride has been reported to be pyramidal, but no explanation for the difference between the chloride and bromide can yet be provided. 

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