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

Baker, Naomi C. A. and McGaughey, Neil and Fletcher, Nicholas C. and Chernikov, Aleksey V. and Hortonb, Peter N. and Hursthouse, Michael B. (2009) The comparison of fac and mer ruthenium(II) trischelate complexes in anion binding. Dalton Transactions (6). pp. 965-972. ISSN 1477-9226

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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.

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Dalton Transactions
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07 Jan 2015 19:50
Last Modified:
21 Sep 2023 01:48