The comparison of fac and mer ruthenium(II) trischelate complexes in anion binding

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

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

The synthesis of three new homoleptic trischelate ruthenium( II) complexes bearing new 2,2'-bipyridine ligands, 5,5'-dibenzylamido-2,2'-bipyridine (L1) and 5-benzylamido-2,2'- bipyridine (L2) has been achieved. In the case of [Ru(L2)(3)](2+), the mer and fac isomers have been separated. H-1 NMR spectroscopic anion binding studies indicate that the two C-3-symmetric pockets provided by [ Ru(L1)(3)](2+) is conducive to receive a range of anions, although this is not readily reflected in the photophysical behaviour. The fac-isomer of [Ru(L2)(3)](2+) does appear to have an enhancement in the binding interactions over the mer form with dihydrogenphosphate salts, although the difference is much less marked with the spherical chloride ions. From X-ray crystallographic evidence, the ability to hold water in the "anion" binding cleft can inhibit the strength of the interactions with anions, giving rise to the observed selectivity for directional oxoanions such as dihydrogen phosphate.
Original languageEnglish
Pages (from-to)965-972
Number of pages8
JournalDalton Transactions
Volumen/a
Issue number6
Early online date17 Dec 2008
DOIs
Publication statusPublished - Feb 2009

ASJC Scopus subject areas

  • Inorganic Chemistry

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