Posts Tagged ‘Nitrogen’
Saturday, February 24th, 2018
Another post inspired by a comment on an earlier one; I had been discussing compounds of the type I.In (n=4,6) as possible candidates for hypervalency. The comment suggests the below as a similar analogue, deriving from observations made in 1989.[1]
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References
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Y. Mazaki, and K. Kobayashi, "Structure and intramolecular dynamics of bis(diisobutylselenocarbamoyl) triselenide as identified in solution by the 77Se-NMR spectroscopy", Tetrahedron Letters, vol. 30, pp. 2813-2816, 1989. http://dx.doi.org/10.1016/S0040-4039(00)99132-9
Tags:C, chemical bonding, Chemistry, free energy, Hypervalency, Hypervalent molecule, Matter, Molecular geometry, Nature, Nitrogen
Posted in Uncategorised | 3 Comments »
Sunday, December 17th, 2017
Alkalides are anionic alkali compounds containing e.g. sodide (Na–), kalide (K–), rubidide (Rb–) or caeside (Cs–). Around 90 examples can be found in the Cambridge structure database (see DOI: 10.14469/hpc/3453 for the search query and results). So what about the ammonium analogue, ammonide (NH4–)? A quick search of Scifinder drew a blank! So here I take a look at this intriguingly simple little molecule.‡
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Tags:Alkalide, Ammonium, Anions, Atomic physics, Chemistry, electron gas, energy, free-electron gas, Hypervalency, Jahn-Teller, kinetic energy density, Matter, Nitrogen, potential energy surface, search query
Posted in Uncategorised | 2 Comments »
Friday, July 8th, 2016
The previous post looked at anomeric effects set up on centres such as B, Si or P, and involving two oxygen groups attached to these atoms. Here I vary the attached groups to include either one or two nitrogen atoms.[1]
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References
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Henry Rzepa., "Anomeric effects at carbon, involving lone pairs originating from one or two nitrogens", 2016. http://dx.doi.org/10.14469/hpc/936
Tags:Anomer, Anomeric effect, Carbohydrate chemistry, Carbohydrate conformation, Carbohydrates, Chemistry, Nitrogen
Posted in crystal_structure_mining | No Comments »