Carbon dioxide, photolysis spectroscopy

Our research focuses on mechanistic and kinetic studies of photochemical and electrochemical CO2 reduction that involves metal complexes as catalysts. This work makes use of UV-vis, NMR, and FTIR spectroscopy, flash photolysis, pulse radiolysis. X-ray diffraction, XANES (X-ray absorption near-edge spectroscopy) and EXAFS (extended X-ray absorption fine structure). Here we summarize our research on photochemical carbon dioxide reduction with metal macrocycles. 

Adsorption of CO on Si02-supported molybdenum leads to the appearance of two vCO IR bands, at 1990 and 2170 cm. The latter is believed to be due to a high-oxidation state molybdenum atom also bound to two oxygen atoms. Rapid time-resolved IR spectroscopy was used to follow the photochemistry of [CpMo(CO)3]2 and [Cp Fe(CO)2]2 in supercritical carbon dioxide. IR spectra (vCO) were used to characterise the photolysis products of (NBD)Mo(CO)4 in polyethylene matrices. ... 

Tuazon et al. (1984a) investigated the atmospheric reactions of TV-nitrosodimethylamine and dimethylnitramine in an environmental chamber utilizing in situ long-path Fourier transform infared spectroscopy. They irradiated an ozone-rich atmosphere containing A-nitrosodimethyl-amine. Photolysis products identified include dimethylnitramine, nitromethane, formaldehyde, carbon monoxide, nitrogen dioxide, nitrogen pentoxide, and nitric acid. The rate constants for the reaction of fV-nitrosodimethylamine with OH radicals and ozone relative to methyl ether were 3.0 X 10 and <1 x 10 ° cmVmolecule-sec, respectively. The estimated atmospheric half-life of A-nitrosodimethylamine in the troposphere is approximately 5 min. 

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