Virtual issues within Crystallography Journals Online make it easier for
readers to find papers relevant to their field of interest, thus
increasing the visibility and impact of those papers, and
consequently the attractiveness of the journals to
authors. Online publishing readily facilitates the creation of
virtual issues, which can be used to bring together and
highlight papers on specific topics that have recently been
published in different issues of the journals. The contents page
of the virtual issue provides links to the original papers.
Absolute structure (December 2012)
For the validation of absolute-structure determination, over the years there has been a heavy reliance on the statistics (values and standard uncertainties) of derived parameters or something equivalent, and little study of the fit of the model to the observed quantities. There has been little questioning of the quality of crystals, data collection and correction methodologies. Clearly, absolute-structure determination is still a rich field, wide open for development, especially for light-atom compounds of great importance to the pharmaceutical and chemical industries.
Polymorphism (December 2011)
Polymorphism, particularly for molecular materials, was perhaps once considered a curiosity. Nowadays, polymorphism has become a crucial issue for the pharmaceutical industry. Different polymorphs of a drug can have quite different properties in terms of solubility, bioavailability, shelf life, ease of production, and other physical properties. Developments in crystal structure prediction in recent years have also highlighted hitherto unknown polymorphs.