Posts Tagged ‘Electron’
Wednesday, February 15th, 2017
This post arose from a comment attached to the post on Na2He and relating to peculiar and rare topological features of the electron density in molecules called non-nuclear attractors. This set me thinking about other molecules that might exhibit this and one of these is shown below.
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Tags:Attractor, brief search, Chemistry, Electron, Electron density, Hydrogen, Interesting chemistry, Molecule, Nature, Physics, Quantum chemistry
Posted in Uncategorised | 11 Comments »
Saturday, February 11th, 2017
On February 6th I was alerted to this intriguing article[1] by a phone call, made 55 minutes before the article embargo was due to be released. Gizmodo wanted to know if I could provide an (almost)† instant‡ quote. After a few days, this report of a stable compound of helium and sodium still seems impressive to me and I now impart a few more thoughts here.
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References
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X. Dong, A.R. Oganov, A.F. Goncharov, E. Stavrou, S. Lobanov, G. Saleh, G. Qian, Q. Zhu, C. Gatti, V.L. Deringer, R. Dronskowski, X. Zhou, V.B. Prakapenka, Z. Konôpková, I.A. Popov, A.I. Boldyrev, and H. Wang, "A stable compound of helium and sodium at high pressure", Nature Chemistry, vol. 9, pp. 440-445, 2017. http://dx.doi.org/10.1038/nchem.2716
Tags:10.1038, Atom, Chemical elements, chemical phenomenon, Chemistry, Company: P. Acucar-CBD, Electride, Electron, Food Retail & Distribution - NEC, helium, Hydrogen, Interesting chemistry, Matter, Oxygen, Physics, social media
Posted in Bond slam, crystal_structure_mining | 11 Comments »
Sunday, January 31st, 2016
Six years ago, I posted on the nature of a then recently reported[1] Cr-Cr quintuple bond. The topic resurfaced as part of the discussion on a more recent post on NSF3, and a sub-topic on the nature of the higher order bonding in C2. The comment made a connection between that discussion and the Cr-Cr bond alluded to above. I responded briefly to that comment, but because I want to include 3D rotatable surfaces, I expand the discussion here and not in the comment.‡
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References
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C. Hsu, J. Yu, C. Yen, G. Lee, Y. Wang, and Y. Tsai, "Quintuply‐Bonded Dichromium(I) Complexes Featuring Metal–Metal Bond Lengths of 1.74 Å", Angewandte Chemie International Edition, vol. 47, pp. 9933-9936, 2008. http://dx.doi.org/10.1002/anie.200803859
Tags:Chemical bond, chemical bonding, Electron, Electron configuration, energy, General, Interesting chemistry, Molecular orbital, Multi-configurational self-consistent field, Quantum chemistry, quintuple bond, search term, Transition metal, Valence bond theory
Posted in Uncategorised | 6 Comments »
Saturday, January 16th, 2016
The post on applying VSEPR ("valence shell electron pair repulsion") theory to the geometry of ClF3 has proved perennially popular. So here is a follow-up on another little molecue, F3SN. As the name implies, it is often represented with an S≡N bond. Here I take a look at the conventional analysis.
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Tags:Chemical bond, chemical bonding, Electron, Hypervalency, Lone pair, Molecular geometry, Octet rule, Quantum chemistry, Stereochemistry, Tetrahedral molecular geometry, Theoretical chemistry, Valence, VSEPR theory
Posted in Uncategorised | 110 Comments »