NDLI: Superstructure formation in $SrBa_{8}[BN_{2}]_{6}$ and $EuBa_{8}[BN_{2}]

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Dierkes, Tobias Eckert, Hellmut Seidel, Stefan Benndorf, Christopher Pöttgen, Rainer Jüstel, Thomas
Description	Author Affiliation: Seidel S ( Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, D-48149 Münster, Germany. pottgen@uni-muenster.de.); Dierkes T ( Fachbereich Chemieingenieurwesen, Fachhochschule Münster, Stegerwaldstraße 39, 48565 Steinfurt, Germany. tj@fh-muenster.de.); Jüstel T ( Fachbereich Chemieingenieurwesen, Fachhochschule Münster, Stegerwaldstraße 39, 48565 Steinfurt, Germany. tj@fh-muenster.de.); Benndorf C ( Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, D-48149 Münster, Germany. pottgen@uni-muenster.de and Institut für Physikalische Chemie, Universität Münster, Corrensstrasse 30, D-48149 Münster, Germany.); Eckert H ( Institut für Physikalische Chemie, Universität Münster, Corrensstrasse 30, D-48149 Münster, Germany and Institute of Physics in Sao Carlos, University of Sao Paulo, Sao Carlos, SP 13560-590, Brazil. eckerth@uni-muenster.de.); Pöttgen R ( Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, D-48149 Münster, Germany. pottgen@uni-muenster.de.)
Abstract	X-ray pure samples of $SrBa_{8}[BN_{2}]_{6}$ and $EuBa_{8}[BN_{2}]_{6}$ were synthesized from appropriate amounts of binary nitrides $(Sr_{3}N_{2},$ $Ba_{3}N_{2}$ and BN in sealed niobium ampoules and EuN, $Ba_{3}N_{2}$ and BN in BN crucibles, respectively) at temperatures up to 1370 K. The structure of $SrBa_{8}[BN_{2}]_{6}$ was refined from single crystal X-ray diffractometer data: Fdm, a = 1595.1(1) pm, $wR(F^{2})$ = 0.0515, 387 $F^{2}$ values and 21 variables. $EuBa_{8}[BN_{2}]_{6}$ has a lattice parameter of 1595.00(9) pm. Both nitridoborates adopt a new 2 × 2 × 2 superstructure variant of the $LiCa_{4}[BN_{2}]_{3}$ type, realized through ordering of vacancies and $Sr^{2+}$ and $Eu^{2+}$ cations, respectively. The structures of $SrBa_{8}[BN_{2}]_{6}$ and $LiCa_{4}[BN_{2}]_{3}$ are related by a group–subgroup scheme. The $Sr^{2+}/vacancy$ ordering leads to an asymmetric coordination (1 × $Sr^{2+}$ and 8 × $Ba^{2+}$ in a distorted, mono-capped square prism) for the $[BN_{2}]^{3−}$ units with B–N distances of 132 and 136 pm. Vibrational spectra of $SrBa_{8}[BN_{2}]_{6}$ and $EuBa_{8}[BN_{2}]_{6}$ confirm the discrete linear $[BN_{2}]^{3−}$ units and $^{11}B$ solid state MAS NMR spectra are compatible with single crystallographic sites for the boron atoms. In $EuBa_{8}[BN_{2}]_{6}$ the spectra are profoundly influenced by interactions of the $^{11}B$ nuclei with the unpaired electrons of the paramagnetic $Eu^{2+}$ ions.
ISSN	14779226
Issue Number	30
Journal	Dalton Trans.
Volume Number	45
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2016-07-26
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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