Ruthenium Cryptates with an Unusual Selectivity for Nitrate

Naomi C.A. Baker, Nicholas C. Fletcher, Peter N. Horton, Michael B. Hursthouse

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


The synthesis of two new tripodal complexes [Ru(L3)](PF6)2 and [Ru(L4)](PF6)2, encapsulating a ruthenium(II) cation has been successfully achieved and the products fully characterized, including by X-ray structural determination. The smaller cavity, built around a tris(2-aminoethyl)amido scaffold demonstrated only moderate and predictable interactions with a range of anions and no significant spectroscopic change with nitrate, chloride and bromide, although dihydrogen phosphate did result in an almost stoichiometric precipitation. The expansion of the cavity to include the more rigid 1,3,5-benzenetricarbonylamide group creates a larger cavity, which shows a decrease in the emission on the introduction of chloride, bromide, hydrogensulfate and nitrate salts, with the 1H NMR titrations giving a surprisingly high binding affinity for nitrate over the smaller and simpler halides.
Original languageEnglish
Pages (from-to)7005–7012
Number of pages8
JournalDalton Transactions
Issue number23
Early online date04 Apr 2012
Publication statusPublished - 21 Jun 2012

ASJC Scopus subject areas

  • Inorganic Chemistry

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