On the Stereochemistry of the Lone-Pair Electrons in AX6E-Systems: Dynamically Distorted Anion in (NH4)2SeBr6, Statically Distorted Anion in l, 3-Propanediammonium-Hexabromoselenate(IV) (C3N2H12)SeBr6

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dc.identifier.uri http://dx.doi.org/10.15488/2455
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/2481
dc.contributor.author Abriel, Walter
dc.date.accessioned 2017-11-24T10:48:03Z
dc.date.available 2017-11-24T10:48:03Z
dc.date.issued 1987
dc.identifier.citation Abriel, W.: On the Stereochemistry of the Lone-Pair Electrons in AX6E-Systems: Dynamically Distorted Anion in (NH4)2SeBr6, Statically Distorted Anion in l, 3-Propanediammonium-Hexabromoselenate(IV) (C3N2H12)SeBr6. In: Zeitschrift für Naturforschung - Section B Journal of Chemical Sciences 42 (1987), Nr. 4, S. 415-420. DOI: https://doi.org/10.1515/znb-1987-0405
dc.description.abstract Using 293 K diffractometer intensity data, the crystal structures of (NH4)2SeBr6 (1) and [H3N(CH2)3NH3]SeBr6 (2) have been determined by single crystal X-ray technique and refined to a final Rw of 0.049 and 0.040, respectively. The dark red crystals of 1 are cubic (space group Fm3m) with a = 10.478(2) Å and Z = 4. This structure contains SeBe62- octahedra (point symmetry m3̄m, distance Se-Br: 2.577(2) Å in an antifluorite type arrangement of cations and anions. In contrast, the SeBr fi 2-ion in 2 is statically distorted (approximate point symmetry 3m, distance Se-Br min. 2,547(2), max. 2.595(2) Å. The dark red crystals are orthorhombic (space group Pnma) with a = 17.795(3), b = 7.5037(6), c = 10.476(1) Å and Z = 4. The results agree with the rules for the appearance of a static/dynamic stereochemical effect of the lone pair electrons given for TeX62- (X = Cl, Br, I) species (W. Abriel, Acta Crystallogr. B 42, 449 (1986)). Consequently these rules can be extended considering SeX62- as well. Basic structural data for all compounds containing AX62- ions (A = Se, Te; X = Cl, Br, I) known to date are given including the ⊿-values (R. D. Shannon, Acta Crystallogr. A 32, 751 (1976)) as a measure for the distortion of the octahedral anion. eng
dc.language.iso eng
dc.publisher Berlin : De Gruyter
dc.relation.ispartofseries Zeitschrift für Naturforschung - Section B Journal of Chemical Sciences 42 (1987), Nr. 4
dc.rights CC BY-NC-ND 3.0
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/3.0/
dc.subject Crystal Structure eng
dc.subject Lone Pair Electrons eng
dc.subject Pseudo-Jahn-Teller Effect eng
dc.subject Selenates eng
dc.subject Symmetry Rules eng
dc.subject.ddc 540 | Chemie ger
dc.title On the Stereochemistry of the Lone-Pair Electrons in AX6E-Systems: Dynamically Distorted Anion in (NH4)2SeBr6, Statically Distorted Anion in l, 3-Propanediammonium-Hexabromoselenate(IV) (C3N2H12)SeBr6
dc.type article
dc.type Text
dc.relation.essn 1865-7117
dc.relation.issn 0932-0776
dc.relation.doi https://doi.org/10.1515/znb-1987-0405
dc.bibliographicCitation.issue 4
dc.bibliographicCitation.volume 42
dc.bibliographicCitation.firstPage 415
dc.bibliographicCitation.lastPage 420
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


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