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dc.contributor.authorAhmed, Ejaz
dc.contributor.authorBreternitz, Joachim
dc.contributor.authorGroh, Matthias Friedrich
dc.contributor.authorIsaeva, Anna A.
dc.contributor.authorRuck, Michael J.
dc.date.accessioned2015-08-03T11:46:02Z
dc.date.available2015-08-03T11:46:02Z
dc.date.issued2014-01-08
dc.identifier.citationAhmed, E., Breternitz, J., Groh, M. F., Isaeva, A., & Ruck, M. (2014). [Sb7Se8Br2]3+and [Sb13Se16Br2]5+- Double and Quadruple Spiro Cubanes from Ionic Liquids. European Journal of Inorganic Chemistry, 2014(19), 3037–3042. doi:10.1002/ejic.201301155
dc.identifier.issn14341948
dc.identifier.doi10.1002/ejic.201301155
dc.identifier.urihttp://hdl.handle.net/10754/563335
dc.description.abstractThe reaction of antimony and selenium in the bromine-rich Lewis acidic ionic liquid [BMIm]Br·4.7AlBr3 (BMIm: 1-butyl-3- methylimidazolium) in the presence of a small amount of NbCl5 at 160 °C yielded dark-red crystals of [Sb7Se8Br 2][AlX4]3. For X = Cl0.15(1)Br 0.85(1), the compound is isostructural to [Sb7S 8Br2][AlCl4]3 [P212 121, a = 12.5132(5) Å, b = 17.7394(6) Å, c = 18.3013(6) Å]. For a higher chlorine content, X = Cl 0.58(1)Br0.42(1), a slightly disordered variant with a bisected unit cell is found [P21212, a = 12.3757(3) Å, b = 17.4116(5) Å, c = 9.0420(2) Å]. The [Sb 7Se8Br2]3+ heteropolycation (C 2 symmetry) is a spiro double-cubane with an antimony atom on the shared corner. From this distorted octahedrally coordinated central atom, tricoordinate selenium and antimony atoms alternate in the bonding sequence. The terminal antimony atoms each bind to a bromine atom. Quantum chemical calculations confirm polar covalent Sb-Se bonding within the cubes and indicate three-center, four-electron bonds for the six-coordinate spiro atoms. The calculated charge distribution reflects the electron-donor role of the antimony atoms. The use of a chlorine-rich ionic liquid resulted in the formation of triclinic [Sb13Se16Br2][AlX4] 5 with X = Cl0.80(1)Br0.20(1) [P$\bar {1}$, a = 9.0842(5) Å, b = 19.607(1) Å, c = 21.511(1) Å, α = 64.116(6), β = 79.768(7), γ = 88.499(7)]. The cationic cluster [Sb13Se16Br2]5+ is a bromine-terminated spiro quadruple-cubane. This 31 atom concatenation of four cubes is assumed to be the largest known discrete main group polycation. A similar reaction in a chloride-free system yielded [Sb7Se 8Br2][Sb13Se16Br2] [AlBr4]8. In its monoclinic structure [P2/c, a = 27.214(5) Å, b = 9.383(2) Å, c = 22.917(4) Å, β = 101.68(1)], the two types of polycations alternate in layers along the a axis. In the series [Sb4+3nSe4+4nBr2](2+n)+, these cations are the members with n = 1 and 3. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
dc.publisherWiley
dc.subjectAntimony
dc.subjectCluster compounds
dc.subjectIonic liquids
dc.subjectMain group elements
dc.subjectPolycations
dc.subjectSelenium
dc.subjectSpiro compounds
dc.title3+ and [Sb13Se16Br2] 5+ - Double and quadruple spiro cubanes from ionic liquids
dc.typeArticle
dc.contributor.departmentChemical Science Program
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalEuropean Journal of Inorganic Chemistry
dc.contributor.institutionFachrichtung Chemie und Lebensmittelchemie, Technische Universität Dresden, 01062 Dresden, Germany
dc.contributor.institutionWestCHEM, School of Chemistry, University of Glasgow, Glasgow G12 8QQ, United Kingdom
dc.contributor.institutionMax-Planck-Institut für Chemische Physik Fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, Germany
kaust.personAhmed, Ejaz
dc.date.published-online2014-01-08
dc.date.published-print2014-07


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