ESR study of electron reactions with carboxylic acids, ketones, and aldehydes in aqueous glasses

Journal Article · Thu Apr 02 04:00:00 EST 1981 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j150607a037· OSTI ID:6417813

Sevilla, M D; Swarts, S; Bearden, R; Morehouse, K M; Vartanlan, T

Electron reactions with a number of carboxylic acids, ketones, and aldehydes were investigated in a deuterated neutral aqueous glass at 77 K by ESR spectroscopy. Free radical reactions which took place upon warming the glasses to temperatures at which the electron adducts become mobile were studied. For carboxylic acids (C/sub n/H/sub 2n+1/CO/sub 2/D, n = 2,3) the deuterated anion radicals (RCH/sub 2/C(OD)/sub 2/) give results which suggest abstraction of a hydrogen from the parent acid to produce radicals of structure RCHCO/sub 2/D. The formic acid deuterated anion is found to undergo a similar mechanism. The acetic acid deuterated anion is not found to abstract from acetic acid, but is found to abstract from isopropyl alcohol. Ketone electron adducts are also found to abstract from their parent compounds to yield radicals of structure RCHC(O)R' with R and R' = CH/sub 3/, C/sub 2/H/sub 5/. Electron reactions with five aldehydes (RCHO with R = H, CH/sub 3/, C/sub 2/H/sub 5/, C/sub 3/H/sub 7/, and i-C/sub 3/H/sub 7/) gave their corresponding alcohol radicals (RCHOD) after deuteration at 77 K. Radicals with R = C/sub 2/H/sub 5/, C/sub 3/H/sub 7/, and i-C/sub 3/H/sub 7/ were found to abstract from the parent aldehyde to form radicals of structure RR'CCHO. The methanol radical (CH/sub 2/OD) showed no further reaction while the ethanol radical (CH/sub 3/CHOD) resulted in the production of the diacetal anion. The results for acids, aldehydes, and ketones show that radicals of structure RC(OD)R' with R' = OD, H, or an alkyl group can act as hydrogen atom abstracting agents.

• Research Organization: Oakland Univ., Rochester, MI
• OSTI ID: 6417813
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 85:7; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ALDEHYDES
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COMPLEXES
DECOMPOSITION
DEUTERIUM COMPOUNDS
DISPERSIONS
ELECTRON ATTACHMENT
ELECTRON SPIN RESONANCE
FERROCYANIDES
GLASS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
IRON COMPLEXES
KETONES
LITHIUM CHLORIDES
LITHIUM COMPOUNDS
LITHIUM HALIDES
LOW TEMPERATURE
MAGNETIC RESONANCE
MIXTURES
ORGANIC ACIDS
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADICALS
RESONANCE
SOLUTIONS
TRANSITION ELEMENT COMPLEXES