Abstract
The new europium borate Eu[B6O8(OH)5]·H3BO3 was obtained by hydrothermal synthesis from europium nitrate hydrate and boric acid. The compound crystallizes in the triclinic space group P1 (no. 2) with the lattice parameters a = 681.59(3), b = 714.17(3), c = 1271.88(6) pm, α = 96.02(1), β = 98.60(1), γ = 101.73(1)° (Z = 2). The structure of Eu[B6O8(OH)5]·H3BO3 is isotypic to that of the samarium borate Sm[B6O8(OH)5]·H3BO3 and is built up from tetrahedral BO4 and trigonal‐planar BO3 units, both of which are protonated at terminal and bridging oxygen positions. Boric acid molecules reside between the borate layers. Through hydrogen bonding, the structure forms a three‐dimensional network. In channels down [110], the Eu3+ cations are eightfold coordinated by oxygen ions. The compound was also characterized by IR and Raman spectroscopy, and it shows typical Eu3+ line emission.
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