The Open Chemistry Database, OChemDb, is a web portal aiming at providing statistical analysis of desired crystal-chemical information, specifically bond distances, bond angles, torsion angles, atom types and space groups. Its easy use well assist the procedure of carefully checking the chemical bonding of a crystal structure. That is useful, e.g., for final assessing of the reliability of the solution of a new structure, for investigating the uncertain nature of a chemical bond, for estimating reasonable bond distances and angles to be used as chemical restraints in the refinement process. OChemDb includes and uses a database which is built from the crystal-chemical information contained in the free small-molecule database COD (The Crystallography Open Database; Gražulis et al., 2012; http://www.crystallography.net/cod/).
Registered users can freely use OChemDb at this link.
Reference to OChemDb:
OChemDb: the free on-line Open Chemistry Database portal for searching and analysing crystal structure information, J. Appl. Cryst. (2018). 51, 1229-1236.
Examples of graphical output of OChemDb follow:
![](http://www.ba.ic.cnr.it/softwareic/ochemdb/wp-content/uploads/sites/9/2018/06/Figure-1-598x1024.png)
![](http://www.ba.ic.cnr.it/softwareic/ochemdb/wp-content/uploads/sites/9/2018/06/Figure-3-1024x605.png)
![](http://www.ba.ic.cnr.it/softwareic/ochemdb/wp-content/uploads/sites/9/2018/06/Figure-4-750x1024.png)
![](http://www.ba.ic.cnr.it/softwareic/ochemdb/wp-content/uploads/sites/9/2018/06/Figure-9-1024x536.png)
![](http://www.ba.ic.cnr.it/softwareic/ochemdb/wp-content/uploads/sites/9/2018/06/Figure-8-1024x510.png)