Archive for July, 2019

CH…O hydrogen bonding competing with layered dispersion attractions.

Friday, July 19th, 2019

I have previously looked at the topic of hydrogen bonding interactions from the hydrogen of chloroform Here I generalize C-H…O interactions by conducting searches of the CSD (Cambridge structure database) as a function of the carbon hybridisation. I am going to jump straight to a specific molecule XEVJIR (DOI: 10.5517/cc5fgpq) identified from the searches appended to this post as interesting for further inspection.[1]



  1. K.S. Huang, M.J. Haddadin, M.M. Olmstead, and M.J. Kurth, "Synthesis and Reactions of Some Heterocyclic Azacyanines1", The Journal of Organic Chemistry, vol. 66, pp. 1310-1315, 2001.

Metadata. Why?

Tuesday, July 2nd, 2019

I have had some interesting discussions recently regarding metadata. What emerges is that it can be quite a broadly defined concept and it is clear that a variety of answers might be obtained when asking the simple question “what is it useful for?” Here I set out some of my answers to that question.