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takyon writes:

Scientists have found evidence of a chemical bond between two hydrogen sulfate ions:

Indiana University researchers have reported the first definitive evidence for a new molecular structure with potential applications to the safe storage of nuclear waste and reduction of chemicals that contaminate water and trigger large fish kills. The study, which was published online Oct. 6 in the German scientific journal Angewandte Chemie International Edition [DOI: 10.1002/anie.201608118] [DX], provides experimental proof for the existence of a chemical bond between two negatively charged molecules of bisulfate, or [HSO₄‍^-].

The existence of this structure -- a "supramolecule" with two negatively charged ions -- was once regarded as impossible since it appears to defy a nearly 250-year-old chemical law that has recently come under new scrutiny. "An anion-anion dimerization of bisulfate goes against simple expectations of Coulomb's law," said IU professor Amar Flood, who is the senior author on the study. "But the structural evidence we present in this paper shows two hydroxy anions can in fact be chemically bonded. We believe the long-range repulsions between these anions are offset by short-range attractions." [...] The molecule's existence is made possible through encapsulation inside a pair of cyanostar macrocycles, a molecule previously developed by Flood's lab at IU. Fatila and colleagues were trying to bind a single bisulfate molecule inside the cyanostar; the presence of two negatively charged bisulfate ions was a surprise.

Hydrogen sulfate (bisulfate).

Original Submission