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Li 2 Eu 3 Br 2 [BO 3 ] 2 : A New Europium(II) Halide Oxoborate with Yellow Luminescence
Author(s) -
Hoslauer JeanLouis,
Lissner Falk,
Blaschkowski Björn,
Schleid Thomas
Publication year - 2020
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.202000227
Subject(s) - europium , octahedron , chemistry , halide , lithium (medication) , square antiprism , crystallography , boron , luminescence , bromide , inorganic chemistry , ion , crystal structure , lanthanide , materials science , optoelectronics , medicine , organic chemistry , endocrinology
The europium(II) oxoborate Li 2 Eu 3 Br 2 [BO 3 ] 2 featuring lithium and bromide ions was synthesized by the reaction of Eu 2 O 3 with Li[BH 4 ] as lithium‐ and boron‐ as well as EuBr 3 as bromide‐source at 750 °C for 24 h in silica‐jacketed sealed niobium capsules. The yellow, air‐stable and yellow fluorescent compound crystallizes in the trigonal space group R 3 m ( a = 1049.06(7) pm, c = 2993.1(3) pm, c/a = 2.853, Z = 12). The two crystallographically distinguishable Eu 2+ cations show either an eightfold coordination as bicapped trigonal prism ([EuO 6 Br 2 ] 12– ) or a ninefold coordination as monocapped square antiprism ([EuO 5 Br 4 ] 12– ). All oxygen atoms stem from isolated triangular [BO 3 ] 3– anions and the Li + cations reside in octahedral voids provided by both oxygen atoms and Br – anions.