Pulse radiolysis studies of the protonation of reduced Ruthenium(II) complexes containing 2,2´-Bipyrimidine

Patterson, Bradley T., Anderson, Robert F., and Keene, F. Richard (2001) Pulse radiolysis studies of the protonation of reduced Ruthenium(II) complexes containing 2,2´-Bipyrimidine. Australian Journal of Chemistry, 54 (12). pp. 751-756.

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Abstract

The pKa values associated with the protonation of the one-electron reduced forms of a series of bis(heteroleptic) [(pp)2RuII(bpm)]2+ and tris(heteroleptic) [(pp)RuII(bpz)(bpm)]2+ complexes were measured using pulse radiolysis techniques (pp = bidentate polypyridyl ligand; bpm = 2,2´-bipyrimidine; bpz = 2,2´-bipyrazine). A linear correlation was observed between pKa and E°red(1) (the redox potential for the first ligand-based reduction) for series of complexes for which the same protonatable ligand was the site of the reduction. For the tris(heteroleptic) complexes studied in which two protonatable ligands were present (bpm and bpz), the plots indicated the protonation was associated with the bpz (rather than the bpm) ligand, consistent with the lower π* energy of bpz which would lead to its preferential reduction.

Item ID: 8492
Item Type: Article (Refereed Research - C1)
Keywords: pulse radiolysis; protonation; polypyrridyl; ruthenium; redox
ISSN: 1445-0038
Funders: ARC
Date Deposited: 17 Feb 2010 23:38
FoR Codes: 03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030207 Transition Metal Chemistry @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 100%
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