Category Archives: Uncategorized

Season’s Greetings

With this star-like atomistic ensemble (it’s the #crystal structure of corundum viewed along the c axis) I wish you all a beautiful holiday season and a new year of peace and happiness.

 

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230@CrystalWorks – The space group list project (update)

We are happy to announce that the space group list project is now completely accessible and incorporated into CrystalWorks.

CrystalWorks is part of the National Chemical Database Service (CDS) of the Royal Society of Chemistry (UK) and comprises crystallographic data of organic (CSD), inorganic (ICSD), and metallic (CrystMet) compounds.

The CrystalWorks link on this page provide full display functionality for all 230 structures. In particular full interactive structure display is available via JSmol (see screenshot below). This provides useful features which are complementary to those of VESTA.

screenshot_crystalworks

Chapter 5 activated!

Dear Students,

today Chapter 5 of our course has been activated!

We hope, you are all doing well!

In this week we will practise the handling with the International Tables a little further. But in contrast to staring only at circles and commas we will additionally look at real world crystals and some of their symmetry and physical properties. And you can be curious about the story of one of the most thrilling scientific discoveries of the last century: the discovery of quasicrystals by Dan Shechtman.

Looking forward to meet you at class and in the forum!

Frank and Michael

Announcement_10-fold_chapter_5

#196 – update

#196 – update

F23

Tomas, one of our readers of this blog, identified an error concerning the space group list project. As he correctly pointed out, the entry of #196 (F23) was wrong as the coordinate set of the solvent free zink  sulfate clearly shows F-43m symmetry (#216).

I have informed the FIZ Karlsruhe and they will delete this wrong entry in their ICSD database with the next update/release.

So, the new (approved) entry for #196 is:
tetrakis((18-Crown-6)-thallium) tetrachloro-manganese bis(tetrachloro-thallium)
Coordination Characteristics of Divalent Tetrahedral (Td and D2d) Tetrahalometalate Anions of 3d Elements and Solid-State 18C6 Reorientations
N.S. Fender, S.S. Finegan, D. Miller. M. Mitchell, I.A. Kahwa, F.R. Fronczek
Inorg. Chem., 1994, 33 (18), pp 4002–4008

http://dx.doi.org/10.1021/ic00096a026
CIF
http://1drv.ms/1nJuoOs

HEWMOL
MnCl4 tetrahedra (purple)
TlCl4 tetrahedra (blue)
https://skfb.ly/BuHu

 

Also the poster of the Space group list project was updated, which you can download here:

https://crystalsymmetry.wordpress.com/2014/08/15/the-space-group-list-project-as-a-poster/