Investigation of the structural phase transitions near 190 K in 4,4′-dichlorobenzophenone

Mitkevich, V.V.; Lirtsman, V.G.; Strzhemechny, M.A.; Avdeenko, A.A.; Eremenko, V.V.

doi:10.1107/S0108768199005480

Acta Crystallographica Section B
Acta Crystallographica
Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS

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Figure 1
Projection on the ac plane of the 4,4′-dichlorobenzophenone crystal structure (a) at room temperature and (b) at 164 K. To indicate the direction of the C7—O bond, two variants of the twofold axis symbol are utilized. The standard symbol is used when the C7—O bond is upwards out of the plane of the figure. The twofold axis symbol with a white central spot is used for indicating the enantiomeric molecule with the C7—O bond pointing in the opposite direction. The low-temperature structure can be obtained from the upper drawing by shifting the middle vertical row of molecules by $[{\bf c}/2]$ . A standard set of new C2/c elementary cells for the LT phase rather than the chosen I2/c set is marked by thin lines (see second footnote on p. 800).

STRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS

ISSN: 2052-5206

Volume 55| Part 5| October 1999| Pages 799-806

doi:10.1107/S0108768199005480

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