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1.  Strontium tetra­fluoro­borate. Erratum 
Erratum to Acta Cryst. (2007), C63, i75–i76.
In the paper by Bunič, Tavčar, Goreshnik & Žemva [Acta Cryst. (2007 ▶), C63, i75–i76], the structure reported as Sr(BF4)2 is actually that of Cd(BF4)2. The correct structure of Sr(BF4)2 is now reported.
doi:10.1107/S0108270109054286
PMCID: PMC2855578
2.  Bis[bis­(3,5-diamino-1H-1,2,4-triazol-4-ium)copper(I)] tris­(hexa­fluoridosilicate) 
In the title compound, [Cu(C2H6N5)2]2(SiF6)3, the asymmetric unit is composed of one [Cu(HL)2]3+ cation (where L is 3,5-diamino-1,2,4-triazole) and one and a half SiF6 2− anions. The rather large positively charged guanazole ligand moiety promotes the low metal coordination number of 2 for the CuI atom. The compound was obtained using the electrochemical alternating-current technique starting from an ethanol–methanol solution of CuSiF6·4H2O and guanazole. In the crystal, N—H⋯F hydrogen bonds play an important role in the formation of a three-dimensional network. As a result of these hydrogen bonds, there are also π–π inter­actions [centroid–centroid distance = 3.3024 (14) Å] involving one of the triazole groups in mol­ecules related by an inversion center, and short Cu⋯N inter­actions [2.909 (3) Å] involving an –NH2 group, leading to the formation of a dimer-like arrangement.
doi:10.1107/S160053681004225X
PMCID: PMC3009260  PMID: 21588872
3.  Bis(diallyl­benzimidazolium) tetra­bromidocuprate(II) 
The structure of the title ionic copper(II) compound, (C13H15N2)2[CuBr4], is built up of isolated 1,3-diallyl­benzimidazolium cations and [CuBr4]2− anions which are inter­connected by electrostatic inter­actions. Differences in packing of the heterocyclic cores results in a different structure compared with earlier investigated chloride and bromide analogues.
doi:10.1107/S1600536808023039
PMCID: PMC2961985  PMID: 21203055
4.  4-Amino­phenyl­sulfur penta­fluoride 
In the title compound, C6H6F5NS, the environment of the S atom is roughly octa­hedral. The axial F—S bond appears slightly elongated with respect to the four equatorial F—S bonds. Equatorial F atoms are staggered with respect to the benzene ring. The N atom is displaced from the benzene plane by 0.154 (4) Å. The F—S—C—C torsion angles differ greatly from the values observed in the related structure of 4-acetamido­phenyl­sulfur penta­fluoride. The packing is stabil­ized by weak N—H⋯F contacts.
doi:10.1107/S160053680800024X
PMCID: PMC2960437  PMID: 21201443

Results 1-4 (4)