Affiliation:
1. Eindhoven University of Technology, Inorganic Materials Chemistry, Eindhoven, Niederlande
2. Max Planck Institute for Chemical Physics os Solids, Dresden, Deutschland
3. Ivan Franko National University, Department of Inorganic Chemistry, Lviv, Ukraine
4. Koc University, Chemistry Department, Istanbul, Türkei
Abstract
AbstractThe title compounds Sr2[BN2]Br (1), Eu2[BN2]Br (2) and Eu2[BN2]I (3) were obtained from reactions of mixtures of Sr3[BN2]2and SrBr2(1) and the binaries EuN, h-BN and EuX2(X= Br, I) (2,3), respectively. The crystal structure of Sr2[BN2]Br was solved from X-ray powder diffraction data and those of the europium compounds from X-ray single crystal data. Sr2[BN2]Br and Eu2[BN2]Br are isotypic crystallizing in the rhombohedral space groupR-3m(No. 166, Pearson code:hR18;Z= 3;a= 4.11692(2) Å,c= 26.4611(2) Å (1);a= 4.0728(3) Å,c= 26.589(3) Å (2)). The crystal structures are built up by layers of condensed edge-sharing [B—N—B]@Eu6and [Br]@Eu6trigonal antiprisms, which are alternately stacked along [001]. Eu2[BN2]I – isotypic to Sr2[BN2]I – crystallizes in the monoclinic space groupP21/m(No. 11, Pearson code:mP24;Z= 4;a= 10.2548(6) Å,b= 4.1587(3) Å,c= 13.1234(9) Å,β= 91.215(4)°). The crystal structure is characterized by slightly puckered layers formed by condensed edge sharing I@Eu6octahedra which are separated by isolated [BN2]3–units. The bond lengths for the strictly linear [BN2]3–anions in(1)and(2)ared(B—N) = 1.351(4) Å and 1.356(8) Å, respectively. In Eu2[BN2]I two crystallograhically distinct [BN2]3–anions are present withd(B1—N) = 1.32(4) Å, 1.37(4) Å andd(B2—N) = 1.30(4) Å, 1.34(4) Å, respectively. Their bond angles vary slightly: ∠(N—B1—N) = 179(3)° and ∠(N—B2—N) = 177(3)°. The magnetic susceptibility data of the europium compounds (2) and (3) indicate that the Eu ions are divalent with 4f7configuration. Vibrational spectra were measured and interpreted based on theD∞hsymmetry of the discrete linear [N—B—N]3–moieties, considering the site symmetry reduction and the presence of two distinct [BN2]3–groups in (3).
Subject
Inorganic Chemistry,Condensed Matter Physics,General Materials Science
Cited by
9 articles.
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