Oct 282011
 
Quasicrystals - Nobel Prize 2011

The Nobel prize for chemistry has been awarded to Daniel Shechtman, from Technion – the Israel Institute of Technology in Haifa, for his discovery of the structure of quasicrystals. Until 1982, it was thought that only two-, three-, four- or six-fold rotational symmetry were possible, however Dr. Schechtman’s discovery changed all that when his electron … Read the rest

Sep 132011
 
CRYSTALS Enhancements:  Absolute Structure Determination (A. L. Thompson and D. J. Watkin)

J. Appl. Cryst.  (2011), 44, 1017-1022.    [ doi:10.1107/S0021889811034066 ]

A summary of the features for investigating absolute structure available in the crystallographic refinement program CRYSTALS is presented, together with the results of analyses of 150 light-atom structures collected with molybdenum radiation carried out with these tools. The results confirm that the Flack and Hooft … Read the rest

Sep 012011
 
Structure of the Month - September 2011

Presented by:  Andrew B. Cairns & Dr. Amber L. Thompson
Research Leader:  Dr. Andrew L. Goodwin
Published:  Journal of the American Chemical Society (cover article)

Negative Linear Compressibility (NLC) is where a material unusually expands in one direction under increasing pressure.  Potassium manganese dicyanoargentate exhibits the largest NLC over an extended range of any known … Read the rest

Aug 312011
 
Chemical Crystallography: Reflections and Predictions

Chemical Crystallography: Reflections and Predictions
A symposium to mark the retirement of David J. Watkin
Friday 9th September 2011

[Update: Thanks to all the speakers and everyone who attended this event in honour of DJW.]

Programme

10.00   Refreshments in the Lecture Theatre Foyer, Inorganic Chemistry Laboratory

10.50   Dr. Richard Cooper (University of Oxford, UK)
Welcome Read the rest

Aug 312011
 
XXII International Congress and General Assembly of the International Union of Crystallography

The triennial Congress of the International Union of Crystallography was held in Madrid, Spain at the end of August 2011. Chem. Cryst. was well represented with several talks and posters including:

Richard I. Cooper
Optimising X-ray Experiment Strategy on-the-fly based on Feedback from Automated Structure Solution (Presentation)

Amber L. Thompson
Battle of the Titans:  Atlas Read the rest

Jun 032011
 
Diamond Light Source Annual Review

The 2011 Diamond Annual Review, which highlights some of the world-class research recently undertaken at Diamond Light Source is now available from their website.  The report includes a contribution from Prof. Paul Beer covering some of the fascinating interlocked structures determined from data collected using the Small Molecule Beamline, I19, as part of the … Read the rest

Jun 012011
 
Structure of the Month - June 2011

Presented by:  Matthew J. Langton, Jonathan D. Matichak & Dr. Amber L. Thompson
Research Leader:  Prof. Harry L. Anderson
Published:  Chemical Science (cover article)

Fully π-conjugated porphyrin oligomers exhibit remarkable properties such as ultrafast energy migration, strong two-photon absorption and wire-like charge transport. The possibility to encapsulate them by rotaxane formation may provide valuable control … Read the rest

May 122011
 
CRYSTALS v14.23

CRYSTALS v14.23c installer is available to download for the Windows platfom.

[Update – patched version 1423c released 27 May, fixes format problem with tiny weights in FCF, CIF input bug]

Selected highlights:

  • Added bond colouring to indicate either element type, or disordered part
  • Improved robustness of weighting scheme 17 (Shelx weights)
  • Output observation weights in
Read the rest
May 012011
 
Structure of the Month - May 2011

Presented by:  Matthew Tatton & Paul Winship
Research Leader:  Prof. Timothy J. Donohoe
Published:  Angewandte Chemie International Edition

This is the final isolated intermediate in the synthesis of Neodysiherbaine A;  crystals were very small, so data were collected on I19 at Diamond.  The natural product is an excitatory amino acid isolated from the Dysidea herbacea … Read the rest