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Evaluation of the Formate Dehydrogenase Activity of Three‐Legged Pianostool Complexes in Dilute Aqueous Solution
Author(s) -
Keller Sascha G.,
Ringenberg Mark R.,
Häussinger Daniel,
Ward Thomas R.
Publication year - 2014
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201402348
Subject(s) - chemistry , formate , formic acid , catalysis , iridium , formate dehydrogenase , aqueous solution , benzoic acid , ligand (biochemistry) , decomposition , context (archaeology) , medicinal chemistry , inorganic chemistry , organic chemistry , paleontology , biochemistry , receptor , biology
Formic acid is an attractive means to reversibly store dihydrogen. In this context, d 6 pianostool complexes rank among the most‐effective formate dehydrogenase catalysts. With biologically generated formic acid in mind, we evaluated the performances of iridium‐based pianostool complexes bearing a cooperative ligand, which are known to catalyze formate decomposition. Interestingly, the phenylpyrazole‐derived catalyst [Cp*Ir(phenpz)(OH 2 )] + ( 7 , Cp* = pentamethylcyclopentadienyl, phenpz = 1‐phenylpyrazole) compares favourably with the very best systems [Cp*Ir(phenpzCO 2 H)H 2 O] + [ 8 , phenpzCO 2 H = 4‐(pyrazol‐1‐yl)benzoic acid] and [Cp*Ir(imim)H 2 O] 2+ [ 11 , imim = 2,2′‐bis(4,5‐dimethylimidazole)]. These catalysts display remarkable air tolerance, recyclability and activity under dilute aqueous conditions.