Posts Tagged ‘energy difference’
Thursday, September 1st, 2016
Bromoallene is a pretty simple molecule, with two non-equivalent double bonds. How might it react with an electrophile, say dimethyldioxirane (DMDO) to form an epoxide?[1] Here I explore the difference between two different and very simple approaches to predicting its reactivity. 
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References
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D. Christopher Braddock, A. Mahtey, H.S. Rzepa, and A.J.P. White, "Stable bromoallene oxides", Chemical Communications, vol. 52, pp. 11219-11222, 2016. http://dx.doi.org/10.1039/C6CC06395K
Tags:chemical bonding, chemical reaction, Chemistry, Delocalized electron, double bond, energy, energy difference, HOMO/LUMO, lowest energy, Molecular orbital, Natural bond orbital, Nature, Physics, Quantum chemistry, stable HOMO-1
Posted in reaction mechanism | No Comments »
Tuesday, February 9th, 2016
The phenomenon of bond stretch isomerism, two isomers of a compound differing predominantly in just one bond length, is one of those chemical concepts that wax and occasionally wane.[1] Here I explore such isomerism for the elements Ge, Sn and Pb.
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References
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J.A. Labinger, "Bond-stretch isomerism: a case study of a quiet controversy", Comptes Rendus. Chimie, vol. 5, pp. 235-244, 2002. http://dx.doi.org/10.1016/S1631-0748(02)01380-2
Tags:a Jahn-Teller, Bond length, chemical concepts, Chemical substance, Company: Ge, Coordination complex, energy, energy difference, Entertainment/Culture, Historical, Hydrogen bond, Isomer, Isomerism, Length, Molecular geometry, Organic chemistry, results of a search, search both bond stretch isomers, SN
Posted in crystal_structure_mining | 1 Comment »
Thursday, November 10th, 2011
Fascination with nano-objects, molecules which resemble every day devices, is increasing. Thus the world’s smallest car has just been built[1]. The mechanics of such a device can often be understood in terms of chemical concepts taught to most students. So I thought I would have a go at this one!
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References
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T. Kudernac, N. Ruangsupapichat, M. Parschau, B. Maciá, N. Katsonis, S.R. Harutyunyan, K. Ernst, and B.L. Feringa, "Electrically driven directional motion of a four-wheeled molecule on a metal surface", Nature, vol. 479, pp. 208-211, 2011. http://dx.doi.org/10.1038/nature10587
Tags:car drives, car rattling, chemical concepts, chemical name atropisomerism, chemical perspective, conformational analysis, day devices, energy, energy difference, General, Hubert Maehr, Interesting chemistry, molecular car, nanocar, PDF, smallest car, Taxol
Posted in Uncategorised | 3 Comments »