English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

6,6′-bis(trifluoromethyl)-thiazine-indigo, C 18 H 8 F 6 N 2 O 2 S 2 , is a yellow derivative of the thiazine-indigo pigments. Due to its insolubility single crystals could not be grown; the structure had to be determined from powder diffraction data. The X-ray powder pattern – measured on a laboratory diffractometer in routine manner – could be indexed, although the crystallite size was only about 20 nm. The crystal struc ture was solved by lattice-energy minimisation using the program CRYSCA. Subsequently, the structure was refined by the Rietveld method using restraints. The compound crys tallises in space group  P 2 1 / c  with  a  = 15.4136(12),  b  = 7.8384(5),  c  = 7.7102(6) Å,  β  = 112.736(6)°,  Z  = 2, with molecules on inversion centres. The molecules are connected by double hydrogen bonds, resulting in planar chains. These chains form stacks in [001] direction. The density is unusually high ( ϱ  = 1.7875 g/cm 3 ), this explains the observed insolubility of the compound.

Structure determination of 6,6′-bis(trifluoromethyl)-thiazine-indigo from laboratory powder data and lattice-energy minimisation