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Media type:
E-Article
Title:
Twinning in chemical crystallography – a practical guide
Contributor:
Herbst-Irmer, Regine
imprint:
Walter de Gruyter GmbH, 2016
Published in:Zeitschrift für Kristallographie - Crystalline Materials
Language:
English
DOI:
10.1515/zkri-2016-1947
ISSN:
2196-7105;
2194-4946
Origination:
Footnote:
Description:
<jats:title>Abstract</jats:title>
<jats:p>A non-negliglible percentage of crystal structures in chemical crystallography are derived from twinned crystals. The treatment of these data is dependent on the type of twinning. Twins by strict, pseudo or reticular merohedry may hamper space group determination and structure solution, while non-merohedral twins mainly hinder the data integration process. One structure determination of each type is described in detail. CsCp*Py (<jats:bold>1</jats:bold>) crystallizes in space group <jats:italic>P</jats:italic>6<jats:sub>5</jats:sub>, mimicking 6/<jats:italic>mmm</jats:italic> symmetry by merohedral twinning. The data of IPr · AlI<jats:sub>3</jats:sub> (<jats:bold>2</jats:bold>) (IPr=1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) simulate <jats:italic>mmm</jats:italic> symmetry although the true space group is <jats:italic>P</jats:italic>2<jats:sub>1</jats:sub>/<jats:italic>n</jats:italic>. The crystals of K[Au(CN)<jats:sub>2</jats:sub>] (<jats:bold>3</jats:bold>) are obverse/reverse twins. [Cu<jats:sub>3</jats:sub>(dppaO<jats:sub>2</jats:sub>)<jats:sub>2</jats:sub>((OSiMe<jats:sub>2</jats:sub>)<jats:sub>2</jats:sub>O)<jats:sub>2</jats:sub>(thf)<jats:sub>2</jats:sub>] (<jats:bold>4</jats:bold>) (ddpaO<jats:sub>2</jats:sub>=bis(diphenylphosphoryl)amine) crystallizes in space group <jats:italic>P</jats:italic>2<jats:sub>1</jats:sub>/<jats:italic>n</jats:italic> and is an example of a non-merohedral twin.</jats:p>