Photochemistry of 9,10-anthraquinone-2-sulfonate in solution. Part 2. Effects of inorganic anions: quenching vs. radical formation at moderate and high anion concentrations

Journal Article · Thu Oct 11 04:00:00 EDT 1984 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j150665a028· OSTI ID:6102701

Loeff, I; Treinin, A; Linschitz, H

The chemical aspects of the interactions between excited 9,10-anthraquinone-2-sulfonate (AQS) and various inorganic anions are examined. The anions which quench triplet AQS can be divided into two groups: Cl/sup -/, Br/sup -/, I/sup -/ and NCS/sup -/ (group I) photoreduce AQS to AQS/sup -/ radical anion only at concentrations higher than that required for complete triplet quenching. The effect increases with concentration and passes through a maximum, with highest quantum yields of radical formation reaching approx. 1 for Cl/sup -/ and NCS/sup -/; on the other hand, NO/sub 2//sup -/, SO/sub 3//sup 2 -/, and N/sub 3//sup -/ (group II) give AQS/sup -/ in parallel to triplet quenching. The nature of the high-concentration effect shown by group I is analyzed. Some results obtained with mixtures of anions support the conclusion that triplet AQS is also responsible for this effect, and it is suggested that triple exciplexes of the type /sup 3/(AQS/sup -/.X/sub 2//sup -/) are involved. With this view and the recently proposed intraradical spin-orbit-coupling (IRSOC) model, a quantitative interpretation of the results is presented.

• Research Organization: Hebrew Univ. of Jerusalem, Israel
• DOE Contract Number: AC02-76ER03117
• OSTI ID: 6102701
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 88:21; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ANIONS
ANTHRAQUINONES
ANTITHYROID DRUGS
AROMATICS
AZIDES
BROMIDES
BROMINE COMPOUNDS
CARBONIC ACID DERIVATIVES
CHARGED PARTICLES
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
DATA
DRUGS
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
HALIDES
HALOGEN COMPOUNDS
HORMONE ANTAGONISTS
INFORMATION
IODIDES
IODINE COMPOUNDS
IONS
NITRITES
NITROGEN COMPOUNDS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
PHOTOCHEMISTRY
QUENCHING
QUINONES
SULFITES
SULFONATES
SULFUR COMPOUNDS
THIOCYANATES