Henry Rzepa's Blog Chemistry with a twist

December 17, 2017

Ammonide: an alkalide formed from ammonia and resembling an electride.

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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April 9, 2017

Cyclopropenium cyclopentadienide: a strangely neutral ion-pair?

Both the cyclopropenium cation and the cyclopentadienide anion are well-known 4n+2-type aromatic ions, but could the two together form an ion-pair?

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April 15, 2016

Oxane oxide: a tautomer of hydrogen peroxide.

If H3N+-O is viable compared with its tautomer H2N-OH when carrying water bridges, then why not try H2O+-O vs HO-OH?

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