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Bis(4-picoline-κN)gold(I) dibromidoaurate(I) and bis(4-picoline-κN)gold(I) dichloridoaurate(I): space-group ambiguity?
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Titel: |
Bis(4-picoline-κN)gold(I) dibromidoaurate(I) and bis(4-picoline-κN)gold(I) dichloridoaurate(I): space-group ambiguity? |
In: | Acta Crystallographica Section C Crystal Structure Communications, 69, 2013, 7, S. 709-711 |
veröffentlicht: |
International Union of Crystallography (IUCr)
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Umfang: | 709-711 |
ISSN: |
0108-2701 |
DOI: | 10.1107/s0108270113015047 |
Zusammenfassung: | <jats:p>Bis(4-picoline-κ<jats:italic>N</jats:italic>)gold(I) dibromidoaurate(I), [Au(C<jats:sub>6</jats:sub>H<jats:sub>7</jats:sub>N)<jats:sub>2</jats:sub>][AuBr<jats:sub>2</jats:sub>], (I), crystallizes in the monoclinic space group<jats:italic>P</jats:italic>2<jats:sub>1</jats:sub>/<jats:italic>n</jats:italic>, with two half cations and one general anion in the asymmetric unit. The cations, located on centres of inversion, assemble to form chains parallel to the<jats:italic>a</jats:italic>axis, but there are no significant contacts between the cations. Cohesion is provided by flanking anions, which are connected to the cations by short Au...Au contacts and C—H...Br hydrogen bonds, and to each other by Br...Br contacts. The corresponding chloride derivative, [Au(C<jats:sub>6</jats:sub>H<jats:sub>7</jats:sub>N)<jats:sub>2</jats:sub>][AuCl<jats:sub>2</jats:sub>], (II), is isotypic. A previous structure determination of (II), reported in the space group<jats:italic>P</jats:italic>\overline{1} with very similar axis lengths to those of (I) [Lin<jats:italic>et al.</jats:italic>(2008).<jats:italic>Inorg. Chem.</jats:italic><jats:bold>47</jats:bold>, 2543–2551], might be identical to the structure presented here, except that its γ angle of 88.79 (7)° seems to rule out a monoclinic cell. No phase transformation of (II) could be detected on the basis of data sets recorded at 100, 200 and 295 K.</jats:p> |
Format: | E-Article |
Quelle: | International Union of Crystallography (IUCr) (CrossRef) |
Sprache: | Unbestimmt |