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 Unported | |
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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