Conversion of carbon dioxide to oxalate by α-ketocarboxylatocopper(II) complexes

Hideyuki Takisawa; Yui Morishima; Shoko Soma; Robert K Szilagyi; Kiyoshi Fujisawa

doi:10.1021/ic5006242

Conversion of carbon dioxide to oxalate by α-ketocarboxylatocopper(II) complexes

Inorg Chem. 2014 Aug 18;53(16):8191-3. doi: 10.1021/ic5006242. Epub 2014 Aug 7.

Authors

Hideyuki Takisawa¹, Yui Morishima, Shoko Soma, Robert K Szilagyi, Kiyoshi Fujisawa

Affiliation

¹ Department of Chemistry, Ibaraki University , Mito, 310-8512 Ibaraki, Japan.

PMID: 25102222
DOI: 10.1021/ic5006242

Abstract

The α-ketocarboxylatocopper(II) complex [{Cu(L1)}{O2CC(O)CH(CH3)2}] can be spontaneously converted into the binuclear oxalatocopper(II) complex [{Cu(L1)}2(μ-C2O4)] upon exposure to O2/CO2 gas. (13)C-labeling experiments revealed that oxalate ions partially incorporated (13)CO2 molecules. Furthermore, the bicarbonatocopper(I) complex (NEt4)[Cu(L1){O2C(OH)}] in an Ar atmosphere and the α-ketocarboxylatocopper(I) complex Na[Cu(L1){O2CC(O)CH(CH3)2}] in an O2 atmosphere were also transformed spontaneously into the oxalato complex [{Cu(L1)}2(μ-C2O4)].