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This erratum is to correct the report of the crystal structure of strontium tetrafluoroborate (Bunič et al., 2007 ). The investigated compound was Cd(BF4)2 and not the reported Sr(BF4)2 because of experimental error. We report here the correct structure of strontium tetrafluoroborate, which appears to be isomorphous with the previously published structures of Ca(BF4)2 (Jordan et al., 1975 ) and Cd(BF4)2 (Tavčar & Žemva, 2005 ). In the Sr(BF4)2 structure, the metal atom possesses a coordination number of eight with a square-antiprismatic coordination polyhedron. The Sr—F distances lie in the narrow range 2.490 (4)–2.538 (4) Å, compared with Ca—F distances in the range 2.330 (2)–2.401 (2) Å in Ca(BF4)2 and Cd—F distances in the range 2.296 (2)–2.381 (3) Å in Cd(BF4)2. The Sr metal center is bonded to eight BF4 − units. In turn, each anion is connected to four Sr atoms. All four F atoms in each anion act as μ2-bridges between B and Sr atoms, resulting in similar B—F bond lengths of 1.376 (7)–1.402 (7) Å.
Routine crystallization of strontium tetrafluoroborate from different solvents usually gives crystals of various solvates. However, crystals of the anhydrous salt were grown by dissolving Sr(BF4)2·2H2O, prepared by the reaction between SrCO3 (Aldrich, 99.99%) and excess aqueous HF (Aldrich, 40%), in acetone and further very slow crystallization.
Data collection: CrystalClear (Rigaku, 1999 ); cell refinement: CrystalClear; data reduction: CrystalClear; program(s) used to solve structure: SIR92 (Altomare et al., 1993 ) and TEXSAN (Molecular Structure Corporation, 1999 ); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ); software used to prepare material for publication: WinGX (Version 1.70; Farrugia, 1999 ) and enCIFer (Version 1.2; Allen et al., 2004 ).
Crystal structure: contains datablocks global, I. DOI: 10.1107/S0108270109054286/ln3136sup1.cif
The authors gratefully acknowledge Dr Stefan Adams (Department of Materials Science and Engineering, National University of Singapore), who first noted some discrepancies in the structure, erroneously entitled as strontium tetrafluoroborate, and to the Slovenian Research Agency (ARRS) for the financial support of the Research Program P1-0045 (Inorganic Chemistry and Technology).
Supplementary data for this paper are available from the IUCr electronic archives (Reference: LN3136). Services for accessing these data are described at the back of the journal.